OWNERSMANUALALLISON3000 MH4000 MH

ATD 5376 Op Manual 5/15/00 11:28 AM Page 1

i

Division of General Motors CorporationP.O. Box 894 Indianapolis, Indiana 46206-0894

OM3349EN

MARCH 2000

OwnersManual

Allison On-Highway

3000 MH, 4000 MH Series Transmissions(WTEC III Controls)

3000 MH, MHR, MHP, MHPR4000 MH, MHR, MHP, MHPR

Printed in U.S.A. Copyright 2000 General Motors Corp.

ii

WARNINGS, CAUTIONS, AND NOTES

IT IS YOUR RESPONSIBILITY to be completely familiar with the warnings and cautions described in this handbook. It is, however, important to understand that these warnings and cautions are not exhaustive. Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. The vehicle manufacturer is responsible for providing information related to the operation of vehicle systems (including appropriate warnings, cautions, and notes). Consequently, Allison Transmission has not undertaken any such broad evaluation. Accordingly, ANYONE WHO USES A SERVICE PROCEDURE OR TOOL WHICH IS NOT RECOMMENDED BY ALLISON TRANSMISSION OR THE VEHICLE MANUFACTURER MUST first be thoroughly satisfied that neither personal safety nor equipment safety will be jeopardized by the service methods selected.Proper service and repair is important to the safe, reliable operation of the equipment. The service procedures recommended by Allison Transmission (or the vehicle manufacturer) and described in this handbook are effective methods for performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.

Three types of headings are used in this manual to attract your attention. These warnings and cautions advise of specific methods or actions that can result in personal injury, damage to the equipment, or cause the equipment to become unsafe.

NOTE:

A note is used when an operating procedure, practice, etc., is essential to highlight.

WARNING:

A warning is used when an operating procedure, practice, etc., if not correctly followed, could result in personal injury or loss of life.

CAUTION:

A caution is used when an operating procedure,practice, etc., if not strictly observed, could result in damage to or destruction of equipment.

TRADEMARK INFORMATION

TRANSYND

TM

is a trademark of Castrol Ltd.DEXRON

is a registered trademark of General Motors Corporation.Pro-Link

is a registered trademark of Micro Processor Systems, Inc.

TABLE OF CONTENTS

Warnings, Cautions, and

Keeping That Allison AdA Brief Description Of TWTEC III Electronic CoTorque Converter . . . . . Planetary Gears And CluCooler Circuit . . . . . . . . Retarder. . . . . . . . . . . . .

Description of AvailableIntroduction . . . . . . . . . Lever Shift Selector . . . Pushbutton Shift SelectoRange Selection Push Selectors With Digita

CHECK TRANS Light . Diagnostic Codes . . . . . Accelerator Control. . . . Downshift And DirectionUsing The Engine To SloUsing The Hydraulic ReRange Preselection . . . . Adapting Shifts . . . . . . Cold Weather Starts . . . Driving On Snow Or IceRocking Out . . . . . . . . . High Fluid Temperature Parking Brake . . . . . . . . Towing Or Pushing . . . . Turning Off The Vehicleiii

Page

Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

INTRODUCTION

vantage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1he Allison 3000 MH, 4000 MH Series Transmissions 4ntrol System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5tches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SHIFT SELECTORS

Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11button And Lever Shiftl Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

DRIVING TIPS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Change Inhibitor Feature . . . . . . . . . . . . . . . . . . . . 17w The Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

tarder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

P

Engine-Driven Power Ta

Periodic Inspections . . . Prevent Major ProblemsImportance Of Proper FlFluid Level Check UsingManual Fluid Check ProCold Check . . . . . . . . . . Hot Check . . . . . . . . . . . Recommended AutomatiKeeping Fluid Clean . . . Fluid And Internal FilterTransmission Fluid ContTransmission Fluid and F

Diagnostic Codes . . . . . Diagnostic Code DisplayDiagnostic Code Listings

ABB

Abbreviations and Defin

Owner Assistance . . . . . Service Literature . . . . . Allison Transmission DiAllison Transmission Reiv

Page

OWER TAKEOFF OPERATION

keoff (PTO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CARE AND MAINTENANCE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28uid Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 The Pushbutton Or Lever Shift Selector . . . . . . . . . 29cedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32c Transmission Fluid And Viscosity Grade . . . . . . . 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Change Interval Recommendations . . . . . . . . . . . . . 34amination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37ilter Change Procedure . . . . . . . . . . . . . . . . . . . . . . 38

DIAGNOSIS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

REVIATIONS AND DEFINITIONS

itions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

CUSTOMER SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55stributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56gional Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

INTROD

KEEPING THAT AL

Allison

MH Series trans

stop and go or change efficient.

The

MH Series transmi

free service. This handbo

ALLISON

-equipped veh

H

YM H S E R I E S

UCTION

LISON ADVANTAGE

missions provide many advantages for the driver who must speeds frequently. Driving is easier, safer, and more

ssions are rugged and designed to provide long, trouble-

ILL

SPEEDZONE

R R

STOP

I E L D

V017241

ok will help you gain maximum benefits from your icle.

Ty

OUTPUTSPEED

SENSOR

ASSEMBLY

COOLER PORTSNOTE: Inch Series Threads

TORQUE CONVERTEWITH LOCKUP CLUTAND TORSIONAL DA2

pical 3000 MH Series Transmission

NAMEPLATE

INPUTSPEEDSENSOR

PADS

MAIN-PRESSURE TAPNOTE: Inch Series Threads

BREATHER

FEEDTHROUGH HARNESSCONNECTOR

V06341

ASSEMBLY PADS(BOTH SIDES)

BREATHER

MAIN-PRESSURE TAPNOTE: Inch Series Threads

FEEDTHROUGH HARNESSCONNECTORR

CHMPER

FILL TUBE AND DIPSTICK(Available on both sides)

3

Typical 4000 MH Series Transmission

TURBINE SPEEDSENSOR

MOUNTINGPAD

INPUT SPEEDSENSOR

NAMEPLATE

FILL TUBE AND DIPSTICKOUTPUT SPEED

SENSOR

FEEDTHROUGHHARNESS

CONNECTOR

V06342

COOLER PORTS

MAIN-PRESSURE TAP

MOUNTING PAD(BOTH SIDES)

COOLER PORTS

FEEDTHROUGHHARNESSCONNECTOR

BREATHER

BREATHER

A BRIEF DESCRIP3000 MH, 4000 M

Included in the Allison O4000 MH Series transmisthe WTEC III control systthree planetary gear sets. TR in the model name) or p

WTEC III ELECTRO

The WTEC III control sysystem consists of five mharnesses Electronic Cdirect electronic communcontrol module (which coposition sensor (or enginpressure switch, and shifprocesses this informatiolocated on the control mooncoming and offgoing cmatching rpm during a shprogrammed into the EC

A feature of WTEC III cseveral engine starts, depThese engine start cyclesvehicle manufacture. Auttransmission components

Seek help from your neaabove items are present,

RetarderOil Level SThrottleEngine Coo4

TION OF THE ALLISON H SERIES TRANSMISSIONS

n-Highway Transmission family are the 3000 MH and sions. The transmissions described in this handbook include em, a torque converter with lockup and torsion damper, and hese transmissions may also contain an integral retarder (the ower takeoff (PTO, the P in the model name).

NIC CONTROL SYSTEM

stem is standard on all 3000 MH and 4000 MH Series. The ajor components connected by customer-furnished wiring ontrol Unit (ECU), engine throttle position sensor (or ication), three speed sensors, remote shift selector, and ntains solenoid valves and a pressure switch). The throttle

e-to-transmission communication link), speed sensors, t selector transmit information to the ECU. The ECU n and then sends signals to actuate specific solenoids dule in the transmission. These solenoids control both lutch pressures to provide closed-loop shift control by ift to a previously established desired profile that is

U.

ontrols is autodetect. Autodetect is active within the first ending upon the component or sensor being detected. begin from when the transmission is installed during odetect searches for the presence of the following or data inputs:

rest Allison Transmission service outlet when any of the but are not responding properly.

Present, Not Present

ensor (OLS) Present, Not PresentAnalog, J 1587, J 1939

lant Temperature Analog, J 1939, J 1587

Another feature of the 3000 MH and 4000 MH Series transmission is its ability to adapt or learn as it opeby the ECU to adapt or

TORQUE CONVERT

The torque converter conpump is the input elemenoutput element and is hy(torque multiplying) elemtorque converter is multippump, the stator starts to multiplication stops and

The lockup clutch is locathree elements piston,backplate are driven by tpiston and the backplate,engaged and released in rengagement provides a deliminates converter slippspeed. The torsional damtransmission through the

The lockup clutch releasrequiring it to be released

NOTE:

If thnew or recalexplained in

NOTE:

Allismanufacturedfrequency inttransportatioradio-telephoresponsibility3000 MH ancustomer sati

The ECU is characteristiattempt to decontained hefrequently re5

rates. Each shift is measured electronically, stored and used learn the optimum conditions for future shifts.

ER

sists of three elements pump, turbine, and stator. The t and is driven directly by the engine. The turbine is the

draulically driven by the pump. The stator is the reaction ent. When the pump turns faster than the turbine, the lying torque. When the turbine approaches the speed of the rotate with the pump and turbine. When this occurs, torque the torque converter functions as a fluid coupling.

ted inside the torque converter and consists of clutch plate/damper, and backplate. The piston and he engine. The clutch plate/damper, located between the is splined to the converter turbine. The lockup clutch is esponse to electronic signals from the ECU. Lockup clutch irect drive from the engine to the transmission gearing. This age and provides maximum fuel economy and vehicle per absorbs engine torsional vibration to prevent powertrain.

es at lower speeds or when the ECU detects conditions .

e shift quality of low mileage vehicles, or vehicles with ibrated ECUs is unacceptable, follow the procedure the ADAPTING SHIFTS section.

on WTEC III electronic control systems are designed and to comply with all FCC and other guidelines regarding radio erference/electromagnetic interference (RFI/EMI) for n electronics. Manufacturers, assemblers, and installers of ne or other two-way communication radios have the sole to correctly install and integrate those devices into Allison

d 4000 MH Series transmission-equipped vehicles to sfaction.

programmed to provide the most suitable operating cs for a specific application. This handbook does not scribe all of the possible combinations. The information rein describes only the operating characteristics most quested by the vehicle manufacturer.

6

OIL

LEV

EL S

ENSO

R

P2 M

ODU

LE

P1 M

ODU

LE

CONV

ERTE

R M

ODU

LE T

URBI

NE P

UMP

LO

CKUP

CLU

TCH/

DAM

PER

STA

TOR

CONV

ERTE

R H

OUS

ING

MO

DULE

CO

NVER

TER

HO

USIN

GRO

TATI

NG C

LUTC

H M

ODU

LE C

1 C

LUTC

H C

2 C

LUTC

H T

URBI

NE S

HAFT

CONT

ROL

MO

DULE

ELE

CTRO

-HYD

RAUL

IC C

ONT

ROLS

MAI

N S

HAFT

MO

DULE

MAI

N S

HAFT

P2

SUN

P3

SUN

MAI

N HO

USIN

G M

ODU

LE M

AIN

HO

USIN

G C

3 CL

UTCH

C4

CLUT

CH C

5 CL

UTCH

FRO

NT S

UPPO

RT/O

IL P

UMP

MO

DULE

FRO

NT S

UPPO

RT O

IL P

UMP

REAR

CO

VER

MO

DULE

OUT

PUT

SHA

FT P

3 C

5 P

ISTO

N

V033

48.0

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cal 3

000

MH

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issi

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7

ROTA

TING

CLU

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LUTC

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C2

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HAFT

CONT

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LECT

RO-H

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P1 M

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P2 M

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OUS

ING

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USIN

G

C3

CLU

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C

4 C

LUTC

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C5

CLU

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MAI

N S

HAFT

MO

DULE

M

AIN

SHA

FT

P2

SUN

P

3 S

UN

REAR

CO

VER

MO

DULE

O

UTPU

T S

HAFT

P

3 M

ODU

LE

C5

PIS

TON

V063

43

CONV

ERTE

R M

ODU

LETU

RBIN

EPU

MP

STAT

OR

LOCK

UPCL

UTCH

/DAM

PER

CONV

ERTE

R H

OUS

ING

MO

DULE

CONV

ERTE

R H

OUS

ING

FRO

NT S

UPPO

RT/O

IL P

UMP

MO

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FRO

NT S

UPPO

RT

OIL

PUM

P

Typi

cal 4

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ross

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tion

PLANETARY GEARS AND CLUTCHES

A series of three helical planetary gear sets and shafts provides the mechanical gear ratios and direction of travel for the vehicle. The planetary gear sets are controlled by five multiplate clutches that work in pairs to produce six forward speeds and one reverse speed. The clutches are applied and released hydraulically in response to electronic signals from the ECU to the appropriate solenoids.

COOLER CIRCUIT

The transmission fluid is cooled by an integral (transmission-mounted) or remote-mounted oil cooler. Connections to the cooling circuit are located at the front or rear of the transmission to facilitate installation of remote cooler lines. On shallow sump models, only rear ports arbe used. The integral cooreplacing the remote cooonly coolant to be routed

RETARDER

The self-contained retardvaned rotor which rotatesoutput shaft. An externalactivated. When the retarby the vehicle air systemfluid with the rotating anhence the output shaft, todownhill grade. See Page

When the retarder is deactor is recharged with flui8

e available. On retarder models, only rear cooler ports may ler is located on the lower rear portion of the transmission, ler manifold. Integral cooler oil ports are internal requiring to and from the cooler.

er is at the output of the transmission and consists of a in a vaned cavity. The rotor is splined to and driven by the

accumulator holds transmission fluid until the retarder is der is activated, the fluid in the accumulator is pressurized and directed into the retarder cavity. The interaction of the d stationary vanes causes the retarder rotor speed, and decrease and slow the vehicle or to limit speed on a 19 for additional retarder information.

tivated, the retarder cavity is evacuated and the accumula-d.

DESCRIPTION OF

INTRODUCTION

Vehicle manufacturers mvehicles. The shift selectlever style or the pushbut

RND5

4

321

MODE

SIX-SPEED, LEFLEVER SELEC

NOTE: Number displayeVisually check to

SHIFT SE

M H S E R I E S

AVAILABLE TYPES

Typical WTEC III Shift Selectors

12345

D

NR

MODE

RND

MODE

V06344

T-HANDTOR

HOLD OVERRIDE BUTTON

DISPLAY MODE/DIAGNOSTIC BUTTON

MODE ID

DIGITAL DISPLAY

MODE BUTTON

MODE INDICATOR(LED)

SIX-SPEED, RIGHT-HANDLEVER SELECTOR

MODE ID

MODEINDICATOR (LED)

Push simultaneouslyto enter diagnosticmode and fluid levelcheck (optional)

d is highest forward range available in selected position. confirm range selected. If display is flashing shift is inhibited.

DIGITAL DISPLAY

PUSHBUTTONSELECTOR

LECTORS9

ay choose different types of shift selectors for their or in your Allison-equipped vehicle will be similar to the ton style shown above.

With an Allison-equippedupshift or downshift duriMH Series does it for yoranges available, and wherecommended to select lowithout retarder) to reduSELECTION, which beg

LEVER SHIFT SEL

General Description.

Thtypical lever positions pr

number of lower forwardprogrammed to have fouprovided should agree wunit. The lever selector c

display, and a display mo

Hold Override Button

. Taccidentally selecting

R

pressing the hold overrid

D

(Drive) is selected, lowpressing the hold overrid

MODE Button

. The

MO

schedule or other specialelectronic control unit at home may have providedThe name of the special label adjacent to the

MO

ECONOMY shift scheduspecial functions which m

PTO enable. The

MODE

Refer to the DIAGNOSISdiagnostic code which ap

view the 2nd diagnostic c5th code positions. The c(LED) is illuminated.

Digital Display

. During

display shows the highesAbnormal operation is al

NOTE:

Visuto be sure th

is pressed,

N

10

vehicle, it is not necessary to select the right moment to ng changing road and traffic conditions. The Allison u. However, knowledge of the shift selector positions, n to select them, will make vehicle control even easier. It is wer ranges when descending long grades (with and

ce wear on service brakes. Be sure to read RANGE ins on Page 12, for related information.

ECTOR

e lever shift selector is an electro-mechanical control. The ovided are R (Reverse), N (Neutral), D (Drive) and some range positions. The MH Series transmissions can be r, five, or six forward ranges. The shift selector positions ith the programming of the transmission electronic control ontains a hold override button, a MODE button, a digital de button.

he lever shift selector has three locked positions to prevent (Reverse), N (Neutral), or D (Drive). Select R, N, or D by e button and moving the lever to the desired position. Once er forward range positions may be selected without

e button.

DE button may allow the driver to enable a secondary shift function that has been previously programmed into the the request of the OEM. For example, the OEM for a motor a secondary shift schedule for improved fuel economy.

function (ECONOMY) should appear on the MODE ID DE button. Pressing the MODE button activates the le and illuminates the MODE INDICATOR (LED). Other ay be activated by the MODE button are D1 selection or

button is also used to view diagnostic code information. section for further explanation. After viewing the first pears in the digital display, press the MODE button to ode logged. Repeat this procedure to view the 3rd, 4th, and ode displayed is active when the MODE INDICATOR

normal operation, when D (Drive) is selected, the digital t forward range attainable for the shift schedule in use. so indicated by the digital display. When all segments of

ally check the digital display whenever the lever is moved at the range selected is shown (i.e., if the N (Neutral) button should appear in the digital display).

the digital display are illucomplete initialization. Wselector. When the displabeen logged. Conditions shift selector and the digPage 16 for detailed explnot shift into range if a Ceither

R

or

D

has been renot been achieved due torelated and will not resulRange Selection section function has been locatedaccessing codes using the

will shift into the lowest

Display Mode/Diagnost

information and diagnostbutton once to obtain tranpresent) and a second tim

PUSHBUTTON SH

General Description

. Th

button, and a digital disp

R Pushbutton

. Press thi

N Pushbutton

. Press thi

D Pushbutton

. Press thiswill appear in the digital lowest available forward

,

(Arrow) Buttons

.

pressed, press the

(Dodisplay window. Likewis

(Down) arrow, press t

Continuous pressing of e

the highest or lowest ran

Access fluid level data anpressing the

(Up) and

Page 29, FLUID LEVELSHIFT SELECTOR, or Pinformation is displayed simultaneous press. Pres

MODE Button

and

Digi

selector above.

11

minated for more than 12 seconds, the ECU did not hen the digital display is blank, there is no power to the

y shows a (cateye), a selector-related fault code has which illuminate the CHECK TRANS light will disable the ital display will show the range actually attained. See anation of the CHECK TRANS light. The transmission will HECK TRANS code is active. When the display shows quested and the display is flashing, the requested range has an inhibit function. Some inhibit functions are vehicle-t in diagnostic codes. Some examples are mentioned in the which follows. Check for active codes if no other inhibit . Refer to the DIAGNOSIS section for information on shift selector. Once D (Drive) is attained, the transmission

range programmed for the D (Drive) position, usually first.

ic Button. Allows access to optional fluid level check ic code information. Press the display mode/diagnostic smission fluid level information (when oil level sensor is e to obtain diagnostic code information.

IFT SELECTORe pushbutton shift selector has R, N, D, , , a MODE

lay.

s button to select Reverse.

s button to select Neutral.

button to select Drive. The highest forward range available display window. The transmission will start out in the range and advance automatically to the highest range.

When a lower range is desired, after D (Drive) has been wn) arrow button until the desired range is shown in the e, if the transmission is held in a low range by the he (Up) arrow to request the next higher range. ither the (Up) or (Down) arrow buttons will request ge available.

d diagnostic codes with the pushbutton selector by (Down) arrow buttons at the same time. Refer to CHECK USING THE PUSHBUTTON OR LEVER age 41, DIAGNOSIS for further information. Fluid level (if optional oil level sensor is present) after the first s both buttons again to obtain diagnostic data.

tal Display. Same function as described in the lever

RANGE SELECTION PUSHBUTTON AND LEVER SHIFT SELECTORS WITH DIGITAL DISPLAY

RANGE SELECTION

NOTE:

Visualpushed or the l(i.e., if the

N

(N

display). A flasdue to an activ

R

Completely stofrom a forward

LED window o

attained.

WARNIvehicle cmust leav

Put th Ensur Apply

they a Choc

vehic

WARNIinhibitorR (ReverCHANGdiagnost

CAUTIOExtendeding and dexceeds

12

ly check the digital display window whenever a button is ever is moved to be sure that the range selected is shown eutral) button is pressed, N should appear in the digital

hing display indicates that the range selected was not attained e inhibit.

p the vehicle and let the engine return to idle before shifting range to Reverse or from Reverse to a forward range. The n the Reverse pushbutton will illuminate and Reverse will be

12345

D

NR

MODE

RND

MODE

V03497.01

PUSHBUTTONSELECTOR

TYPICALLEVERSELECTOR

NG: If you leave the vehicle and the engine is running, the an move suddenly and you or others could be injured. If you e the engine running, do not leave the vehicle until you:e transmission in N (Neutral)ande that the engine is at low idle rpm (below 1000)and the parking brake and emergency brakes and make sure re properly engagedand

k the wheels and take any other steps necessary to keep the le from moving.

NG: R (Reverse) may not be obtained due to an active . Always be sure that R is not flashing whenever se) is selected. See DOWNSHIFT AND DIRECTION E INHIBITOR FEATURE on Page 17. Check for active ic codes if R (Reverse) is not attained.

N: Do not idle in R (Reverse) for more than five minutes. idling in R (Reverse) may cause transmission overheat-amage. Always select N (Neutral) whenever time at idle

five minutes.

(continued on next page)

RANGE SELECTION

N

Use

N

eutral whextended periovehicles equipp

by the ECU duvehicle will no

starts in any ra

also used durinequipped with selected. Be su

RANGE SELECTION PUSHBUTTON AND LEVER SHIFT SELECTORS WITH DIGITAL DISPLAY (contd)

5

D

NR

MODE

R MODEPUSHBUTTON TYPICAL

WARNIbrakes arunexpect

WARNIbrake muunexpectapply veparking b

WARNIengine bsevere trdamage,13

en you start the engine, to check vehicle accessories, and for ds of engine idle operation (longer than five minutes). For ed with the pushbutton selector, Neutral is automatically set

ring startup. For vehicles equipped with the lever selector, the t start until Neutral has been manually selected. If the vehicle nge other than Neutral, seek service immediately. Neutral is g stationary operation of the power takeoff (if your vehicle is a PTO). The digital display will show N when Neutral is re to select N (Neutral) before turning off the vehicle engine.

1234N

D

V03497.01

SELECTOR LEVERSELECTOR

NG: When starting the engine, make sure the service e applied. Failure to apply the service brakes may result in ed vehicle movement.

NG: Vehicle service brakes, parking brake, or emergency st be applied whenever N (Neutral) is selected to prevent ed vehicle movement. Selecting N (Neutral) does not hicle brakes, unless an auxiliary system to apply the rake is installed (see Operators Manual for the vehicle).

NG: If you let the vehicle coast in N (Neutral), there is no raking and you could lose control. Coasting can also cause ansmission damage. To help avoid injury and property do not allow the vehicle to coast in N (Neutral).

(continued on next page)

RANGE SELECTION

NOTE: Turn ofrom N (Neutranot be attainedof other interloExamples are (service brake

D The transmissispeed increasesAs the vehicle on the Drive puwill be attained

RANGE SELECTION PUSHBUTTON AND LEVER SHIFT SELECTORS WITH DIGITAL DISPLAY (contd)

12345

D

NR

MODE

RND

MODE

V03497.01

PUSHBUTTONSELECTOR

TYPICALLEVERSELECTOR

WARNIobtainedflashing DIRECTCheck fo

CAUTIOExtendedand damfive minu14

ff the vehicle HIGH IDLE switch, if present, before shifting l) to D (Drive) or R (Reverse). D (Drive) or R (Reverse) will

unless the shift is made with the engine at idle. Also, be aware cks that would prevent obtaining D (Drive) or R (Reverse). wheelchair lift not stored and service brakes not applied interlock present).on will initially attain first range when Drive is selected. As , the transmission automatically upshifts through each range. slows, the transmission automatically downshifts. The light shbutton will illuminate and the appropriate range of Drive .

NG: Even though D (Drive) is selected, it may not be due to an active inhibitor. Always be sure that D is not whenever D (Drive) is selected. See DOWNSHIFT AND ION CHANGE INHIBITOR FEATURE on Page 17. r active diagnostic codes if D (Drive) is not attained.

N: Do not idle in D (Drive) for more than five minutes. idling in D (Drive) may cause transmission overheating

age. Always select N (Neutral) if time at idle is longer than tes.

(continued on next page)

RANGE SELECTION

6*5*4*32

Occasionally, rdesirable to resprovide greaterthe greater the

The pushbuttonranges. Push thdigital display was selected, threduced (this p* Actual range

1 Use this range maneuvering inprovides the vebraking effect. (Down) arro

RANGE SELECTION PUSHBUTTON AND LEVER SHIFT SELECTORS WITH

WARNIgoing dodamage.downshito a loweyou to mautomatiduring dothe lowerange. ThApply thexceedin15

oad conditions, load, or traffic conditions will make it trict automatic shifting to a lower range. Lower ranges engine braking for going down grades (the lower the range, braking effect). selector utilizes arrow buttons to select individual forward e (Up) or (Down) arrow to the desired range. The will show your choice of range. Even though a lower range e transmission may not downshift until vehicle speed is

revents excessive engine speed in the lower range).s available depend on programming by vehicle manufacturer.

when pulling through mud and deep snow, when tight spaces, or while driving up or down grades. First range hicle with its maximum driving torque and maximum engine

For vehicles equipped with the pushbutton selector, push the w until first range appears in the select window.

DIGITAL DISPLAY (contd)

12345

D

NR

MODE

RND

MODE

V03497.01

PUSHBUTTONSELECTOR

TYPICALLEVERSELECTOR

NG: If you just downshift or just use service brakes when wnhill, you can lose control and cause injury and property To help avoid loss of control, use a combination of fting, braking, and other retarding devices. Downshifting r transmission range increases engine braking and helps aintain control. The transmission has a feature to prevent c upshifting above the lower range selected. However, wnhill operation, if engine governed speed is exceeded in

r range, the transmission may upshift to the next higher is will reduce braking and could cause a loss of control.

e vehicle brakes or other retarding device to prevent g engine governed speed in the lower range selected.

M H S E R I E

CHECK TRANS LIG

The electronic control sywith the transmission sysvehicle, and transmissionproblem condition, the Ethe instrument panel, and

Each time the engine is soff after a few seconds. Tcircuits are working propduring ignition, or if the checked immediately.

Continued illumination othan start-up) indicates ththe CHECK TRANS lighselector. The shift selectotransmission will not res

The indications from thetransmission is not perfocapabilities. Before turnishort time in the selectedService should be perfordamage to the transmissi

When the CHECK TRANtransmission will remainTRANS light is corrected

NOTE: For without the ETransmissiothere is a tracheck for diaS

HT

stem is programmed to inform the operator of a problem tem and automatically take action to protect the operator, . When the Electronic Control Unit (ECU) detects a

CU restricts shifting, turns on the CHECK TRANS light on registers a diagnostic code.

tarted, the CHECK TRANS light will illuminate, then turn his momentary lighting is to show that the status light erly. If the CHECK TRANS light does not illuminate light remains on after ignition, the system should be

f the CHECK TRANS light during vehicle operation (other at the ECU has signaled a diagnostic code. Illumination of t is accompanied by a flashing display from the shift r display will show the actual range attained and the

pond to shift selector requests.

shift selector are provided to inform the operator that the rming as designed and is operating with reduced ng the ignition off, the transmission may be operated for a range in order to limp home for service assistance. med immediately in order to minimize the potential for

some problems, diagnostic codes may be registered CU activating the CHECK TRANS light. Your Allison

n authorized service outlet should be consulted whenever nsmission-related concern. They have the equipment to gnostic codes and to correct problems which arise.

DRIVING TIPS16

on.

S light comes on and the ignition switch is turned off, the in N (Neutral) until the condition causing the CHECK .

Generally, while the CHECK TRANS light is on, upshifts and downshifts will be restricted and direction changes will not occur. Lever and pushbutton shift selectors do not respond to any operator shift requests while the CHECK TRANS light is illuminated. The restricted or during any c

DIAGNOSTIC COD

See detailed information

ACCELERATOR CO

The position of the accelshifting occurs. When theat high engine speeds. A upshifts to occur at lowethe ECU how much the oaffects directional chang(Reverse)).

DOWNSHIFT AND

There is no speed limitatiwhich cause a direction cD (Drive).

WARNINGsudden movto D (Drive)while the thrif the throttlsudden movthan three seAvoid this cor R (Rever

NOTE: Turnshifting fromN (Neutral) is above idle17

lockup clutch is disengaged when transmission shifting is ritical transmission malfunction.

ES

in the DIAGNOSIS section.

NTROL

erator pedal influences the timing at which automatic pedal is fully depressed, upshifts will occur automatically partially depressed position of the pedal will cause the r engine speeds. An electronic throttle position signal tells perator has depressed the pedal. Excessive throttle position e shifts (shifts from N (Neutral) to D (Drive) or R

DIRECTION CHANGE INHIBITOR FEATURE

on on upshifting, but there is on downshifting and for shifts hange such as D (Drive) to R (Reverse) or R (Reverse) to

: To help avoid injury or property damage caused by ement of the vehicle, do not make shifts from N (Neutral) or R (Reverse) when the throttle is open. If you shift ottle is open too much, the transmission will only engage e is closed in the next three seconds. That can cause a ement of the vehicle. Leaving the throttle open longer conds causes the transmission to remain in N (Neutral).

ondition by making shifts from N (Neutral) to D (Drive) se) only when the throttle is closed.

off the vehicle HIGH IDLE switch, if present, before N (Neutral) to D (Drive) or R (Reverse). The shift from

to D (Drive) or R (Reverse) is inhibited when engine speed .

Manual range downshifts will not occur until a calibration value of output speed is reached. When a range downshift is manually selected and the transmission output speed is above the calibraeven though a lower rangretarding device to reducthen the shift to the lowe

Directional shifts, D (Drioccur if selected when this above the calibration ltime period for engine spspeed is three seconds. Sinhibited when the ECU that auxiliary equipment directional shift is inhibithe digital display, if presReselect D (Drive) or R transmission output speeselector, just depress the lever to N (Neutral) and requested and the enginebelow the calibration valuor R (Reverse) will occuabove the calibration limlimit during the next threthat engine was at idle an

USING THE ENGIN

To use the engine as a brexceeding the maximum

WARNINGgoing downhdamage. To downshiftinlower transmmaintain conupshifting aoperation, ifthe transmisreduce brakibrakes or othspeed in the18

tion value, the transmission will stay in the range it was in e was requested. Apply the vehicle service brakes or some e the transmission output speed to the calibration value and r range will occur.

ve) to R (Reverse) or R (Reverse) to D (Drive), will not rottle position, engine speed, or transmission output speed imit for a calibration time period. The current calibration eed is 0.5 seconds and for throttle position and output hifts from N (Neutral) to D (Drive) or R (Reverse) are also has been programmed (by input/output function) to detect is in operation and the shift should not be allowed. When a ted, the ECU will put the transmission in N (Neutral) and ent, will flash the letter of the range selected (D or R).

(Reverse) when engine throttle, engine speed, and d are below the calibration value. With a pushbutton desired pushbutton again. With a lever selector, move the then to the desired range. When a direction change shift is throttle, engine speed, and transmission output speed drop e during the calibration time interval, the shift to D (Drive)

r. For example, if the transmission output speed was just it when R (Reverse) was selected, but dropped below the e seconds, the shift to R (Reverse) would occur (assuming d throttle was closed).

E TO SLOW THE VEHICLE

aking force, select the next lower range. If the vehicle is speed for this range, use the service brakes and/or retarder

: If you just downshift or just use service brakes when ill, you can lose control and cause injury and property

help avoid loss of control, use a combination of g, braking, and other retarding devices. Downshifting to a ission range increases engine braking and helps you to trol. The transmission has a feature to prevent automatic

bove the lower range selected. However, during downhill engine governed speed is exceeded in the lower range, sion may upshift to the next higher range. This will ng and could cause a loss of control. Apply the vehicle er retarding device to prevent exceeding engine governed

lower range selected.

to slow the vehicle. Whedown-shift the transmissdown grades. When the vdesirable to preselect a lospeed is exceeded, the tra

USING THE HYDR

Regardless of the type ofsafety features are comm

The retarder can bconditions are pres

Vehicle brake light(periodically verify

Anti-lock brake sythe brake system is

A hydraulic retarder is avretarder is activated and cvehicle type and particulavailable. Automatic conthe amount of retarder ap

WARNINGINCLEMENSLIPPERY. To help avoicontrol, be rthe transmisnot detectedcheck for prdoes not appOn vehiclesclosed throttalways manuweather or s

NOTE: Thedisengaged)active. Howerecommende19

n a lower speed is reached, the ECU will automatically ion. Engine braking provides good speed control for going ehicle is heavily loaded, or the grade is steep, it may be wer range before reaching the grade. If engine-governed nsmission will upshift automatically to the next range.

AULIC RETARDER

Allison retarder controls on your vehicle, the following on to each configuration:e disabled when inclement weather or slippery road ent.s should always be on when the retarder is applied that they are working).

stems send a signal to the transmission ECU to indicate that activated.

ailable on all of the models covered in this manual. The ontrolled in various ways. The control depends upon the

ar duty cycle. Both manual and automatic controls are trols are applied by the ECU. Some types of controls and plication are shown in Table 1 on Page 20.

S: DO NOT USE THE RETARDER DURING T WEATHER OR WHEN ROAD SURFACES ARE De-energize the retarder at the master control switch.d injury or property damage caused by loss of vehicle eady to apply vehicle brakes or other retarding device if sion retarder does not apply. If a retarder is present but is by autodetect, the retarder will not function. Be sure to oper retarder function periodically. Whenever the retarder ly, seek service help immediately.

which have the primary retarder control based upon le position, brake pedal position, or brake apply pressure, ally disable the retarder controls during inclement

lippery road conditions.

retarder is automatically disabled (and the lockup clutch is whenever the vehicle ABS (anti-lock brake system) is ver, in case the ABS system malfunctions, it is d that the retarder enable switch, if present, be disabled.

The presence of a retardesystem.

WARNINGfunctioning,manufactureservice outlethe Pro-Link

NOTE: Whethe transmisLow fluid lev

NOTE: Therequested. BAnticipationnon-emergen

T

TypeManual Separ

Hand

Automatic Auto

Brake Pressure Apply **

Singl

Three

Pedal Position ** Speci

Combinations of the above systems **

Autopress

Autotwo p

Handpress

Foot press

Handfor sp

NOTE: * Tth

** Fre

1b20

r must be autodetected as part of the WTEC III control

: If your transmission has a retarder but it is not it may not have been autodetected during vehicle . Go immediately to your nearest Allison Transmission t to have autodetect reset or the retarder enabled using

.

n reduced retarder performance is observed, be sure that sion fluid level is within the operating band on the dipstick. el is a common cause for retarder performance complaints.

retarder requires about one second to reach full capacity e sure to anticipate this delay when using the retarder. will prevent unnecessary service brake applications during cy stops.

able 1. Types of Retarder Control

Description Amount of Applicationate apply pedal Zero to Full apply

lever * Six levels based on lever position

Full On * Full On when closed throttle sensed

e pressure switch

pressure switches

Off or Full On (based on brake pressure)

1 3, 2 3, or Full On (based on brake pressure)al brake pedal 1 3, 2 3, or Full On (based on pedal position) half-on plus ure switch *

Half capacity at closed throttle or Full On with brake pressure

1 3 on plusressure switches *

1 3, capacity at closed throttle or 2 3 andFull On with brake pressure

lever plusure switch *

6 levels of modulation with lever, or Full On with brake pressure

pedal plusure switch

Full modulation with separate pedal, or Full On with brake pressure

lever plus interface ecial pedal *

6 levels of modulation with lever, or 3 levels of modulation based on pedal position

hese control systems may apply the retarder at high speed on grades when e vehicle has road speed limiting and the retarder is enabled.or retarder apply systems integrated with the service brake system, the tarder is most effective when applied with light brake pedal pressure for

2 seconds to allow the retarder to fully charge. Added pedal pressure can e applied when more aggressive braking is desired.

Contact your vehicle manbeen integrated into your

RANGE PRESELECRange preselection meansencounter or expect to encgive you better control on range increases engine brabetween that range and the

ADAPTING SHIFTS

When poor shift quality ithe following procedure number of shifts in a rela

CAUTIONequipped wTHE RETACLOSED TOBSERVE LIMITS ATrange to incavailable.In the eventRETARDERVEHICLE. OBSERVE ensure that

NOTE: Traneffectivenessreduce retard

NOTE: Presfuel econom

NOTE: Shifshifts fully a21

ufacturer to understand how the retarder controls have vehicle.

TION selecting a lower range to match driving conditions you ounter. Learning to take advantage of preselected shifts will slick or icy roads and on downgrades. Downshifting to a lower king. The selection of a lower range often prevents cycling next higher range on a series of short up-and-down hills.

s due to the installation of a new or recalibrated ECU, use to restore good shift quality by completing a prescribed tively short time instead of over several days of operation.

: Observe the following cautions when driving a vehicle ith a retarder.RDER WORKS ONLY WHEN THE ENGINE IS AT HROTTLE.TRANSMISSION AND ENGINE TEMPERATURE ALL TIMES. Select the lowest possible transmission rease the cooling system capacity and total retardation

of OVERHEATING, DECREASE THE USE OF THE ; USE THE SERVICE BRAKES TO SLOW THE

THE RETARDER/SUMP OVERTEMP LIGHT to it responds properly to retarder temperature.

smission oil level must be set correctly for highest retarder . As much as 2 liters (2 quarts) too high or too low can er effectiveness and increase transmission temperature.

electing during normal operation may result in reduced y.

t concerns may indicate the transmission has never had the dapted.

Adaptive does not functitemperature. Normal runprocedure is followed.

Check transmission sumphot sump temperature be

All segments of this procshift quality variation is i

1. From Neutral, withpedal, select the foReverse, Drive, Nethe next shift.

2. Release all brakes aonce shift is complto the Closed ThrotWOT.

3. Continue the procecombination availais complete, releasClosed Throttle (CRepeat for the WO

4. From a Stop, releas(PT ~ 50% to 60%Release the throttlestop.

5. From a Stop, releas60%) Upshifts to thModerate to Heavystop.

6. From a Stop, releasUpshifts to the higClosed and Preselevehicle brakes, dec

NOTE: If thbrake system

NOTE: Bracause passenretarder or ethis segment22

on below 100 degrees Fahrenheit transmission sump ning hot sump temperature is recommended before this

level and assure it is set to Hot Full at normal running fore this procedure is followed.

edure are to be repeated a minimum of 5 times or until ndistinguishable from shift to shift.

parking brake set and service brakes applied via foot llowing sequence: Drive, Neutral, Reverse, Neutral, Drive, utral. Allow each shift to fully complete before selecting

nd perform this sequence: Wide Open Throttle (WOT) 12; ete, release the throttle to closed and decelerate to just prior tle (CT) 21 and perform a Step Thru (ST) 21 by going to

ss initiated in Step 2 for each Upshift and Downshift ble. Example: Wide Open Throttle (WOT) 23; once shift e the throttle to closed and decelerate to just prior to the T) 32 and perform a Step Thru (T) 32 by going to WOT. T 34/ST 43, WOT 45/ST 54, WOT 56/ST 65.

e vehicle brakes and perform a set of Part Throttle) Upshifts to the highest attainable range for the vehicle. to Closed and, using Light vehicle brakes, decelerate to a

e vehicle brakes and perform Part Throttle (PT ~ 50% to e 3rd range. Release the throttle to Closed and, using vehicle brakes (NOT panic or wheel lock), decelerate to a

e vehicle brakes and perform a set of Wide Open Throttle hest attainable range for the vehicle. Release the throttle to ct Down to 1st Range using the shift selector. Use light elerate to a stop.

e vehicle is equipped with an output retarder or engine , these systems should be turned off for this segment.

king should be aggressive but not to the level that would ger complaints. If the vehicle is equipped with an output

ngine brake system, these systems should be turned off for .

7. If the vehicle is equfor this segment. FWide Open ThrottlRelease the throttleor engine brake, de

8. Approach the gradsteady at WOT andrequired to ascend

9. Approach the gradsteady at Part Throthe Powered Down

COLD WEATHER SAll 3000 MH and 4000 Muntil specific temperaturerestrictions.

Transmission operation athe use of a lower viscosAUTOMATIC TRANSM

NOTE: Allibrakes to foapplied). If gand PT Pow

Sump Oil Tempera32C (25F) to 7C7C (19F) *

*NOTE: Whtransmissionthis procedu

To shR (R

To shD (D

Failure to foTRANS lighN (Neutral).23

ipped with a retarder or engine brake, turn that system on rom a Stop, release vehicle brakes and perform a set of e Upshifts to the highest attainable range for the vehicle. to Closed and, using Light vehicle brakes and the retarder celerate vehicle to a stop.

e in the highest safely attainable range and hold the throttle allow the vehicle to perform the Powered Downshifts as the grade.

e in the highest safely attainable range and hold the throttle ttle (PT ~ 50% to 60%) and allow the vehicle to perform shifts as required to ascend the grade.

TARTSH transmissions are programmed to restrict full operation

s are reached. Refer to the following chart for temperature

t cold ambient temperatures may require preheating or ity transmission fluid. Refer to RECOMMENDED ISSION FLUID AND VISCOSITY GRADE on Page 32.

son Transmission does not recommend using the vehicle rce Powered Downshifts (PD, downshifts with the throttle rades are available, these should be used to adapt in WOT

ered Downshifts.

tureCHECK

TRANS Light Operation (19F) OFF Neutral, Reverse, Second

OFF Full operation in all ranges

en sump temperature is below 10C (50F), and fluid is C4 (not DEXRON or TRANSYNDTM), follow re when making directional change shifts:ift from forward to reverse; select N (Neutral) and then everse).ift from reverse to forward; select N (Neutral) and then rive), or other forward range.llow this procedure may cause illumination of the CHECK t and then transmission operation will be restricted to

DRIVING ON SNOW

Here is where all of yourwhat transmission you habefore you lose traction. to maintain. Accelerate overy important to slow gryou reach the lower rangan unexpected downshift

ROCKING OUT

If the vehicle is stuck in Shift to D (Drive) and appvehicle has rocked forwabrakes. Allow the engine

WARNINGjamming onhelp avoid inwhen drivin

NOTE: TheABS (antilosystem malfif present, be

WARNINGsudden movto D (Drive)while the thrif the throttlsudden movthan three seAvoid this cor R (Rever

CAUTIONshift changeare stuck anseconds in e30 seconds overheat. Ifoperate the 24

OR ICE

ability as a skilled driver comes into focus regardless of ve. If possible, reduce your speed and select a lower range Select the range that will not exceed the speed you expect r decelerate very gradually to prevent losing traction. It is adually when a lower range is selected. It is important that e selected before attempting to accelerate. This will avoid during acceleration.

deep sand, snow, or mud, it may be possible to rock it out. ly steady, light throttle (never full throttle). When the

rd as far as it will go, apply and hold the vehicle service to return to idle; then select R (Reverse). Release the brakes

: Using the retarder on wet or slippery roads can be like the brakes your vehicle may slide out of control. To jury or property damage, turn the retarder enable to OFF

g on wet or slippery roads.

retarder is automatically disabled whenever the vehiclesck brake system) is active. However, in case the ABS unctions, it is recommended that the retarder enable switch, disabled.

: To help avoid injury or property damage caused by ement of the vehicle, do not make shifts from N (Neutral) or R (Reverse) when the throttle is open. If you shift ottle is open too much, the transmission will only engage e is closed in the next three seconds. That can cause a ement of the vehicle. Leaving the throttle open longer conds causes the transmission to remain in N (Neutral).

ondition by making shifts from N (Neutral) to D (Drive) se) only when the throttle is closed.

: DO NOT make N (Neutral)-to-D (Drive) or directional s when the engine rpm is above idle. Also, if the wheels d not turning, do not apply full power for more than 30 ither D (Drive) or R (Reverse). Full power for more than under these conditions will cause the transmission to the transmission overheats, shift to N (Neutral) and engine at 12001500 rpm until it cools (23 minutes).

and apply a steady, light tit will go. Again, apply aidle. This procedure mayshift continues to move tD (Drive) or directional s

HIGH FLUID TEMP

The transmission is constemperatures are exceede

If the sump fluid temperain the higher ranges

If the transmission overhtransmission. (Refer to thMAINTENANCE sectio

If the engine temperature goverheated. Stop the vehicproperly, run the engine atshould reduce the transmis2 or 3 minutes. If temperat

If the engine temperatureproblem is indicated. If hpersists, stop the engine maintenance personnel.

SumpFluidRetar

CAUTIONseconds at fstalled. Prolfluid temperoverheat da25

hrottle and allow the vehicle to rock in R (Reverse) as far as nd hold the service brakes and allow the engine to return to be repeated in D (Drive) and R (Reverse) if each directional he vehicle a greater distance. Never make N (Neutral)-to-hift changes when the engine rpm is above idle.

ERATURE

idered to be overheated when any of the following d:

ture reaches 128C (262F) the ECU will inhibit operation

eats during normal operations, check the fluid level in the e Fluid Check Procedures as described in the CARE AND

n starting on Page 28 of this handbook.)auge indicates a high temperature, the transmission is probably le and check the cooling system. If it appears to be functioning 12001500 rpm with the transmission in N (Neutral). This sion and engine temperatures to normal operating levels in ures do not decrease, reduce the engine rpm.

indicates a high temperature, an engine or radiator igh temperature in either the engine or transmission

and have the overheating condition investigated by

fluid 121C (250F) to cooler 149C (300F)der out fluid 165C (330F)

: The engine should never be operated for more than 30 ull throttle with the transmission in range and the output onged operation of this type will cause the transmission ature to become excessively high and will result in severe mage to the transmission.

PARKING BRAKE

Select N (Neutral) and bewhen it is not attended. Abeen maintained per the

TOWING OR PUSH

The engine cannot be stavehicle, disconnect the daxle shafts from the drivecover the wheel openingsauxiliary air supply will

TURNING OFF THEAlways select N (Neutra

WARNINGpossible sudnecessary torunning, plaparking brak

CAUTIONthe drivelinecause seriou26

sure that the parking brake is applied to secure the vehicle lways make sure the vehicles parking brake system has

manufacturers specifications.

ING

rted by pushing or towing. Before pushing or towing a riveline, lift the drive wheels off the road, or remove the wheels. When the axle shafts are removed, be sure to to prevent loss of lubricant and entry of dust and dirt. An

usually be required to actuate the vehicle brake system.

VEHICLEl) prior to turning off the vehicle engine.

: Take the following precautions so that unexpected, den vehicle movement is avoided. Whenever it becomes leave the vehicle, even momentarily, while the engine is ce the transmission shift selector in N (Neutral), set the e and/or emergency brakes, and chock the wheels.

: Failure to lift the driving wheels off the road, disconnect , or remove the axle shafts before pushing or towing can s transmission damage.

ENGINE-DRIVEN P

If a PTO is present, it wi3000 MH Series transmiThe PTO is located on thPTO drive gear is enginePTO can be operated wh

The PTO gear is in constaare either constant drive clutched drive PTO is po

Be sure that the limits foexceeded. Consult the veall MH Series equipped vspeed limits programmedlimits have default valuesneed to be set for your pamanufacturer to see if yolimits have been establish

When the programmed eThe PTO engagement muoperational speeds (eithedeactivate and the PTO e

CAUTION:imposed on

POWER OPERM H S E R I E S

OWER TAKEOFF (PTO)

ll be mounted on either left side, right side, or top for a ssion depending upon the converter housing configuration. e left side or top for a 4000 MH Series transmission. The -driven and therefore provides direct engine power. The en the vehicle is either moving or stopped.

nt mesh with the drive gear in the converter housing. PTOs (output always powered) or clutched drive. The output of a wered when the PTO clutch is pressurized.

r PTO engagement speed and operational speed are not hicle manufacturers literature for these speed limits. Also, ehicles with PTO enable have engagement and operational into the ECU to help protect PTO equipment. Some speed which are programmed out of the operating range and will rticular PTO duty cycle. Consult your vehicle

ur transmission has been programmed and what operational ed.

ngagement speed is exceeded, the PTO will not engage. st be retried after the speed has been reduced. When

r engine or transmission output) are exceeded, the PTO will ngagement process must be repeated.

Do not exceed the engagement and operational speed limits the driven equipment during the operation of the PTO.

TAKEOFF ATION27

M H S E R I E

PERIODIC INSPECThe Allison 3minimum maconnections

For easier inspection, thefor loose bolts and leakinharnesses regularly. Chectransmission fluid whichcondition to your mainte

PREVENT MAJOR

Help the WTEC III contMinor problems can be kAllison Transmission dis

Shifting feels odd Transmission leaks Unusual transmiss

engine thermostatiload, have been mi

CHECK TRANS l

IMPORTANCE OF P

Because the transmissionimportant that the propertoo low, the converter anfluid level is too high, theto shift erratically or ove

The MH Series has an elobtain an indication of flsensor diagnostics take pcontrol system. FrequentS

TIONS000 MH and 4000 MH Series transmissions require intenance. Careful attention to the fluid level and the

for the electronic and hydraulic circuits is most important.

transmission should be kept clean. Make periodic checks g fluid lines. Check the condition of the electrical k the engine cooling system occasionally for evidence of

would indicate a faulty oil cooler. Report any abnormal nance personnel.

PROBLEMS

rol system oversee the operation of the transmission. ept from becoming major problems if you notify an tributor or dealer when one of these conditions occur:

fluidion-related sounds (changes in sound caused by normal c fan cycling, while climbing a long grade with a heavy staken for transmission-related sounds)ight comes on frequently

ROPER FLUID LEVEL

fluid cools, lubricates, and transmits hydraulic power, it is fluid level be maintained at all times. If the fluid level is

CARE ANDMAINTENANCE28

d clutches do not receive an adequate supply of fluid. If fluid can aerate. Aerated fluid can cause the transmission

rheat.

ectronic oil level (OLS) sensor that allows the operator to uid level from the shift selector. However, no oil level lace unless the OLS is autodetected by the WTEC III ly check for the presence of oil level diagnostics if the

transmission is known to49 engine starts, the WTis known to be present, bcircuit is required. After select the OLS function uTroubleshooting Manual

FLUID LEVEL CHEOR LEVER SHIFT S

The transmission is equipfluid level information.

Park the vehicle oparking brake.

Pushbutton shift simultaneously pre

Lever shift selectomode button one ti

The fluid temperat The transmission i The vehicle has be

fluid to settle. The engine is at id The transmission o

The indication of a delayfollowed by a numerical

NOTE: To cdipstick, theoil level senstransmissionAny temperaresult in an I

NOTE: Theone time.

NOTE: Theconditions a29

contain an OLS. If an OLS is not detected during the first EC III system concludes that no OLS is present. If an OLS ut has not been detected, then troubleshooting of the OLS the OLS circuit is repaired, reset autodetect or manually sing the Pro-Link. (Refer to SA2973 WTEC III

for detailed troubleshooting procedures.)

CK USING THE PUSHBUTTONELECTOR

ped with the electronic oil level sensor in order to read

n a level surface, shift to N (Neutral), and apply the

selector If equipped with an oil level sensor, ss the (Up) and (Down) arrow buttons.r If equipped with an oil level sensor, press the display me.

ure is above 60C (140F) and below 104C (220F).s in N (Neutral).en stationary for approximately two minutes to allow the

le.utput shaft is stopped.

ed fluid level check is a in the display window display.

orrectly check the transmission fluid level using the transmission fluid must be at operating temperature. The or method of checking the fluid level compensates for fluid temperature between 60C104C (140F220F). ture below 60C (140F) or above 104C (220F) will nvalid for Display condition.

pushbutton and lever selectors can display one character at

fluid level check may be delayed until the following re met:

1. Correct FluidLevel Check Mfluid is within transmission dcompensates fo

2. Low Fluid LevLevel Check MLevel) and theExample: 2 ilevel within the

3. High Fluid LeLevel Check MLevel) and theExample: 1 i

4. Invalid for DiLevel Check Mnumerical dispreceive the fluiThe fault code

To exit the fluid levshift selector, or pr

* Report sensor failure displaythe nearest Allison Transmis

NOTE: Flui

Dispo,L, o,L, o,L, o,L, o,L, o,L, o,L, o,L,

CAUTIONirregular shiif not correc30

Level o,L is displayed (o,L represents Fluid (Oil) ode), followed by o,K. The o,K display indicates the

the correct fluid level zone. The sensor display and the ipstick may not agree exactly because the oil level sensor r fluid temperature.

el o,L is displayed (o,L represents Fluid (Oil) ode), followed by Lo (Lo represents Low Oil number of quarts the transmission fluid is low.ndicates 2 additional quarts of fluid will bring the fluid middle of the oK zone.vel o,L is displayed (o,L represents Fluid (Oil) ode), followed by HI (HI represents High Oil number of quarts the transmission is overfilled.ndicates 1 quart of fluid above the full transmission level.splay o,L is displayed (o,L represents Fluid (Oil) ode), followed by and a numerical display. The

lay is a fault code and indicates conditions are not proper to d level information, or that there is a system malfunction. s that may be encountered are shown in Table 2.

el display mode, press any range button on the pushbutton ess the display mode button once on the lever shift selector.

to a distributor or dealer in your area (check the telephone directory for sion distributor or dealer).

d level diagnostic displays occur one character at a time.

Table 2. Oil Level Fault Codeslay Cause of Code, 0, X Settling time too short, 5, 0 Engine speed (rpm) too low, 5, 9 Engine speed (rpm) too high, 6, 5 Neutral must be selected, 7, 0 Sump fluid temperature too low, 7,9 Sump fluid temperature too high, 8, 9 Output shaft rotation, 9, 5 Sensor failure*

: Low or high fluid level can cause overheating and ft patterns. These conditions can damage the transmission ted.

MANUAL FLUID C

Clean aroundThis will aidhydraulic sytransmissionfollowing prmaintenance

COLD CHECK

The Cold Check determisafely until a Hot Check

A cold check may be mafluid has been confirmed(60120F).

If the engine has blevel surface and a

Start and run the eminute. Shift to D circuits of air. Shif

After wiping the ddipstick is within tlevel is not within within the COLD R

WARNINvehicle cyou mustyou:

Put th Apply

they a Chock

vehicl

CAUTIONtransmissiondipstick andmark.31

HECK PROCEDURE

the end of the fill tube before removing the dipstick. in preventing dirt or foreign matter from entering the stem, which can cause valves to stick, undue wear of parts, or clogged passages. Check the fluid level by the ocedure and report any abnormal level to your personnel.

nes if the transmission has enough fluid to be operated can be made.

de after initial start-up and the presence of transmission (the sump fluid temperature is then typically 1649C

een shut down for an extended time, park the vehicle on a pply the parking brake.ngine at idle (500800 rpm) in N (Neutral) for about one (Drive) and then to R (Reverse) to clear the hydraulic t to N (Neutral) and leave engine at idle.ipstick clean, check the fluid level. If the fluid on the he COLD RUN band, the level is satisfactory. If the fluid this band, add or drain fluid as necessary to bring the level UN band.

G: If you leave the vehicle and the engine is running, the an move suddenly and you or others could be injured. If leave the engine running, do not leave the vehicle until

e transmission in N (Neutral)and the parking brake and emergency brakes and make sure re properly engagedand the wheels and take any other steps necessary to keep the e from moving.

: DO NOT start the engine until the presence of sufficient fluid has been confirmed. Remove the transmission fluid be sure that the static fluid level is near the HOT FULL

Perform a Hot Chetemperature (719

HOT CHECKBecause the fluid level risan accurate check.

Be sure fluid has re160200F). If a fluid level when thtransmission has b

Park the vehicle onbrake and allow th

After wiping the dis anywhere within

If the level is not wlevel within the HO

Be sure that fluid lif readings are not is clean and not clonearest Allison dis

RECOMMENDED AAND VISCOSITY G

TRANSYNDTM is Transmission and Severe Duty and Eto the GM DEXROthrough Allison dis

CAUTIONperiods of tiTransmissiofluid level c

CAUTIONengine is idis at the pro32

ck at the first opportunity after normal operating 3C; 160200F) is reached.

es as temperature increases, the fluid must be hot to ensure

ached normal operating temperature (7193C; transmission temperature gauge is not present, check e engine water temperature gauge has stabilized and the een operated under load for at least one hour. a level surface and shift to N (Neutral). Apply the parking

e engine to idle (500800 rpm).ipstick clean, check the fluid level. The safe operating level the HOT RUN band on the dipstick.ithin this band, add or drain fluid as necessary to bring the T RUN band.

evel checks are consistent. Check level more than once and consistent, check to be sure that the transmission breather gged. If readings are still not consistent, contact your

tributor or dealer.

UTOMATIC TRANSMISSION FLUID RADEa full synthetic transmission fluid developed by Allison Castrol Ltd. This fluid meets Allison specifications for xtended Drain Intervals. TRANSYNDTM is fully qualified N-III and Allison C4 specifications and is available tributors and dealerships.

: The transmission must not be operated for extended me until a Hot Check has verified proper fluid level. n damage can result from extended operation at improper onditions.

: An accurate fluid level check cannot be made unless the ling (500800 rpm) in N (Neutral), the transmission fluid per temperature, and the vehicle is on a level surface.

Hydraulic fluids (otransmission perfoDEXRON-III fluTRANSYNDTM anand off-highway a

Some DEXRON-the fluid is qualifieDEXRON-III liccontainer or consuTransmission deale

When choosing thecapabilities, and/orTable 3 lists the mbe safely operated equipment or by runeutral for a minim

CAUTIONresult in tran

Table 3. Minimum

ViscosityGrade

SAE 0W-20* or TRADEXRON-IIISAE 10WSAE 15W-40SAE 30SAE 40

* Arctic as defined by MIL-33

ils) used in the transmission are important influences on rmance, reliability, and durability. TRANSYNDTM and ids are recommended for on-highway applications. d Allison Type C-4 fluids are recommended for severe duty

pplications.III fluids are also qualified as Type C-4 fluids. To ensure d for use in Allison transmissions check for the ense numbers and/or C-4 approval numbers on the lt the lubricant manufacturer. Consult your Allison r or distributor before using other fluid types.

optimum viscosity grade of fluid, duty cycle, preheat geographical location must be taken into consideration.

inimum fluid temperatures at which the transmission may without preheating. Preheat with auxiliary heating nning the equipment or vehicle with the transmission in um of 20 minutes before attempting range operation.

: Disregarding minimum fluid temperature limits can smission malfunction or reduced transmission life.

Operating Temperature For Transmission Fluid

Ambient Temperature BelowWhich Preheat Is Required

Celsius FahrenheitNSYNDTM 30 22

27 1720 415 5

0 3210 50

L-46167B (Ref. 13-TR-90.)

KEEPING FLUID C

It is absolutely necessaryin clean containers to pre

FLUID AND INTERINTERVAL RECOM

Table 4 is given only as a

CAUTIONhave been usolutions cotransmission

CAUTIONdetermined changes maguidelines wcontaminati34

LEAN

that transmission fluid be clean. The fluid must be handled vent foreign material from entering the transmission.

NAL FILTER CHANGEMENDATIONS

general guide for fluid and filter change interval.

: Do not use containers or fillers for transmission fluid that sed for any antifreeze solution. Antifreeze and coolant ntain ethylene glycol which, if introduced into the , can cause the clutch plates to fail.

: Transmission fluid and filter change frequency is by the severity of transmission service. More frequent y be necessary than recommended in the general hen operating conditions create high levels of

on or overheating.

35

Table 4. Transmission Fluid and Filter Change

SEVERE VOCATION GENERAL VOCATIONOil Filters Oil Filters

Main Lube/Auxiliary MainLube/

AuxiliaryRequired Initial Filter Change Interval (All Fluids)

8000 km (5,000 Miles)

200 Hours

8000 km (5,000 Miles)

200 Hours

8000 km(5,000 Miles)

200 Hours

8000 km(5,000 Miles)

200 Hours

Recommended Fluid and Filter Change Intervals (Non-TRANSYNDTM Fluids)

19 300 km(12,000 Miles)

6 Months500 Hours

19 300 km(12,000 Miles)

6 Months500 Hours

19 300 km(12,000 Miles)

6 Months500 Hours

40 200 km(25,000 Miles)

12 Months1000 Hours

40 200 km(25,000 Miles)

12 Months1000 Hours

40 200 km(25,000 Miles)

12 Months1000 Hours

Recommended Fluid and Filter Change Intervals (TRANSYNDTM Fluid)80 400 km

(50,000 Miles)24 Months

2,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

160 900 km(100,000 Miles)

48 Months4,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

36

Modified Fluid and Filter Change Intervals (Mixture* of TRANSYNDTM and Non-TRANSYNDTM Fluids)

Table 4. Transmission Fluid and Filter Change (contd)SEVERE VOCATION GENERAL VOCATION

Oil Filters Oil Filters

Main Lube/Auxiliary MainLube/

Auxiliary40 200 km (25,000 Miles)

12 Months1000 Hours

40 200 km (25,000 Miles)

12 Months1,000 Hours

40 200 km (25,000 Miles)

12 Months1,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

40 200 km (25,000 Miles)

12 Months1,000 Hours

80 400 km(50,000 Miles)

24 Months2,000 Hours

* Mixture is defined as the quantity of fluid remaining in the transmission after a standard fluid change combined with the quantity of TRANSYNDTM that is required to fill the transmission to the proper level. A mixture of TRANSYNDTM vs. Non-TRANSYNDTM other than as defined in this paragraph does not meet the requirements that permit eligibility for the TRANSYNDTM fluid and filter change intervals.

NOTE: Change fluid/filters after recommended distance, months, or hours have elapsed, whichever comes first.

Severe Vocation: All Retarders, On/Off Highway, Refuse, Tour Coach, and Transit

General Vocation: All Others

Fluid Analysis. Transmisby monitoring fluid oxidConsult your local telephand accurate fluid analysTechnicians Guide for Ainformation.

TRANSMISSION F

Fluid Examination. At edirt or water. A normal aoperation.

Water. Obvious water coin the cooler (heat exchafluid areas of the cooler. Replace leaking coolers.

Engine Coolant. Engineimmediate action to prevdisassemble, inspect, andand varnish deposits resuclutch plates contaminate

CAUTIONthere is evidtemperaturediscolored, shown in Ta

Table 5

TestViscosityTotal Acid NumbSolids

* A= Absorbance Un

NOTE: Cooto locate the37

sion protection and fluid change intervals can be optimized ation according to the tests and limits shown in Table 5. one directory for fluid analysis firms. To ensure consistent is, use only one fluid analysis firm. Refer to the utomatic Transmission Fluid, SA2055, for additional

LUID CONTAMINATION

ach fluid change, examine the drained fluid for evidence of mount of condensation will appear in the fluid during

ntamination of the transmission fluid or transmission fluid nger) water indicates a leak between the water andInspect and pressure test the cooler to confirm the leak.

coolant in the transmission hydraulic system requires ent malfunction and possible serious damage. Completely clean the transmission. Remove all traces of the coolant, lting from engine coolant contamination. Replace friction d with engine coolant (ethylene glycol).

: Transmission fluid and filters must be changed whenever ence of dirt or a high temperature condition. A high condition is indicated when the transmission fluid is has a strong odor or has exceeded oil analysis limits ble 5.

. Fluid Oxidation Measurement Limits

Limit25% change from new fluid

er +3.0 change from new fluid2% by volume maximum

its

ler water can also be contaminated by engine oil; be sure correct source of cooler water contamination.

Metal. Metal particles inin the oil filter) indicate ithe sump, the transmissiosource. Metal contaminainternal and external hydparticles could lodge.

TRANSMISSION FLU

Drain Fluid Drain the

71C93completel

Remove the drain into a suitable con

Examine the fluid CONTAMINATIO

Replace Filters. See foll MD 3060s prior to

S/N 6610009730 Remove twelv

seals 5, and tw When reinstall

Install a squarfilter) and inst

Continue the proce

CAUTIONcooler circuspecificationreplaced.

NOTE: Doreplaced.38

the fluid (except for the minute particles normally trapped nternal transmission damage. If these particles are found in n must be disassembled and closely inspected to find their

tion requires complete transmission disassembly. Clean all raulic circuits, cooler, and all other areas where the

ID AND FILTER CHANGE PROCEDURE

. fluid when the transmission is at operating temperature C (160F200F). Hot fluid flows quicker and drains more y.plug from the control module and allow the fluid to drain tainer.

as described in TRANSMISSION FLUID N section.

owing figure. S/N 6510069120 and HD 4060s prior to

e bolts 1, two filter covers 2, two o-rings 4, two square cut o filters 6 from the bottom of the control module.ing parts, lubricate and install an o-ring 4 on each cover 2. e cut seal 5 on each cover 2. Lubricate filter o-ring (inside all filters 6 onto covers 2.dure beginning at the CAUTION on the next page.

: After flushing the cooler, be sure to check the external it restriction. If circuit pressure drop is above , the cooler has excessive trapped particles and must be

not drain the transmission fluid if only filters are being

3000 MH / MD306HD 4060s beginni Remove 12 bo

o-rings 5 and t When reinstall

cover 2. LubriInstall new gasin cover.

Install filter and cofilter/cover assembassemblies in by h

CAUTIONThis can damwrench to tireplacement

DRAINPLUG

6

4000 MH/MD 4060

5

4

21

3

MAINLU39

Location of Filters for Service

0s beginning with S/N 6510069120 and 4000 MH / ng with S/N 6610009730lts 1, two filter covers 2, two gaskets 3, two o-rings 4, two wo filters 6 from the bottom of the control module.ing parts, lubricate and install new o-rings 4 and 5 on each cate o-ring inside filter 6 and push filter onto each cover 2. ket 3 on each cover 2 and align holes in gasket with holes

ver assemblies into the filter compartment. Align each ly with the holes in the channel plate/sump. Push the cover and to seat the seals.

: Do not use the bolts to draw filter covers to the sump. age the covers, seals, or sump. Do not use an impact

ghten these bolts or stripped threads and expensive parts may result. Use a torque wrench to tighten these bolts.

DRAINPLUG

FILTERCOVER

V03532.02

3000 MH/MD 3060

MAIN

MAIN

LUBE

BELUBE

Install six bolts int

Replace the drain p(1824 lb ft).

Refill Transmission. Theinitial fill. Fluid remains draining the transmission

Ta

Transmission3000 MH / MD 30603000 MH / MD 30604000 MH / HD 4060 4000 MH / HD 4060* Approximate quantity, doe40

o each cover and tighten to 5161 Nm (3845 lb ft).lug O-ring. Install the plug and tighten to 2532 Nm

amount of refill fluid is less than the amount used for the in the external circuits and transmission cavities after . After refill, check the fluid level.

ble 6. Transmission Fluid CapacityInitial Fill* Refill*

Sump Liters Quarts Liters Quarts4 inch 24.5 26 18 192 inch 18 19 10 10.54 inch 45 48 37 392 inch 38 40 30 31

s not include external lines and cooler hose.

DIAGNOSTIC COD

Continued illumination o(not start-up) indicates thmay activate a code withdiagnostic codes can be two methods: by using t9000 Diagnostic Tool. Uthe instruction manual fureading, code clearing anMore detailed informatioService Literature section

Shift S

Diagnostic codes are numoperation. Each code con

RND

MODE

SHISELEC

DIAGN

M H S E R I E S

ES

f the CHECK TRANS light during vehicle operation e ECU has signaled a diagnostic code. Poor performance out illuminating the CHECK TRANS light. Up to five recorded. Diagnostic codes can be read and cleared by he shift selectors shown below or using the Pro-Link se of the Pro-Link 9000 Diagnostic Tool is described in rnished with each tool. Basic information on code d troubleshooting is covered in this DIAGNOSIS section. n is available in the Troubleshooting Manual shown in the .

12345

D

NR

MODE

FT DIAGNOSTIC

7 8

ProLink

94 5 61 2 30 ENTER FUNC

OSIS41

elector/Pro-Link 9000 Diagnostic Tool

erical indications relating to a malfunction in transmission sists of a two-digit main code and a two-digit subcode.

TORS READER / TOOLV03499.01

These codes are logged iotherwise most recent comay be listed in memoryis dropped from the list. Iis not included on the sevcodes and code informatidiagnostic data reader.

The ECU separately storcode is any code that is ccodes are codes that are raffect the ECU decision-if a problem is isolated, i

DIAGNOSTIC COD

Diagnostic codes can be With the pushbutto With the Pro-Link

Pro-Link 9000 difurnished with eac

Diagnostic codes are disp

The code list position is subcode. Each item is discontinuously until the nebutton. The following lisexample:

1. Code list position 2. Main code 2, 53. Subcode 1, 14. Cycle repeats d

To view the second, thirdpress the MODE button. position is displayed to r

If a listed code is active, Any code position whichfor both the main and sub

Pushbutton Shift Select Bring the vehicle t Apply the parking 42

n a list in the ECU memory with the most severe or de listed first. A maximum of five codes (numbered d1d5) at one time. As codes are added, the oldest nonactive code f all codes are active, the code with the lowest priority that erity list is dropped from the list. Access to the diagnostic on is through the pushbutton and lever shift selectors or the

es the active and historical (nonactive) codes. An active urrent in the ECU decision-making process. Historical etained in the ECUs memory and will not necessarily making process. Historical codes are useful in determining s intermittent, or results from a previous malfunction.

E DISPLAY PROCEDURE

read and cleared by two methods:n or lever shift selector

9000 Diagnostic Data Reader. The use of the

agnostic tool is described in the instruction manual h tool.

layed as follows:

the first item displayed, followed by the main code and the played for about one second. The display cycles xt code list position is accessed by pressing the MODE t represents the display cycle using code 25 11 as an

d, 1

, 1

, fourth, and fifth positions (d2, d3, d4, d5), momentarily Momentarily press the MODE button after the fifth estart the sequence of code list positions.

the LED indicator next to the MODE button is illuminated. does not have a diagnostic code logged will display - codes.

oro a stop at a safe location.brake.

To Display Stored Codes Simultaneously pr

the diagnostic displevel sensor is inst

Observe the digita Press the MODE b

To Clear Active Indicato Press and hold the

mode indicator (LEindicators such as codes are self-clea

To Exit The Diagnostic M Press the (Up) a

N (Neutral).Lever Shift Selector

Bring the vehicle t Apply the parking

To Display Stored Codes Press the DISPLAY

press the button Observe the digita Press the MODE b

NOTE: Be sThis is essen

NOTE: If thwill again be

NOTE: Be sThis is essen43

:ess the (Up) and (Down) arrow buttons once to access lay mode press the buttons twice if a transmission oil alled. l display for codes (codes will appear one digit at a time).utton to see the next code repeat for subsequent codes.

rs and Resume Vehicle Operation: MODE button for approximately three seconds until the

D) flashes. Release the MODE button and active the CHECK TRANS light will not be illuminated. Some ring and others require ignition cycles to clear.

ode:nd (Down) arrow buttons at the same time, or press

o a stop at a safe location.brake.

: MODE button once to access the diagnostic display mode

twice if a transmission oil level sensor is installed.l display for codes (codes will appear one digit at a time).utton to see the next code repeat for subsequent codes.

ure to record all codes displayed before they are cleared. tial for troubleshooting.

e condition that caused the code is still present, the code come active.

ure to record all codes displayed before they are cleared. tial for troubleshooting.

To Clear Active Indicators and Resume Vehicle Operation: Press and hold the

mode indicator (LE Begin operating as

opportunity by an

To Exit The Diagnostic M Press the DISPLAY

any position other

DIAGNOSTIC COD

The following table preseoccur during the operatioTS2973EN Troubleshoot

NOTE: If thwill again be

Tab

CODES

MAINCODE

SUBCODE

13 12 1.ECU InputVoltage Low

13 13ECU Input VoltageMedium Low

13 23ECU InputVoltage High

14 12,23 1.Oil Level Sensor44

MODE button for approximately three seconds until the D) flashes.

normal have the transmission checked at the earliest Allison Transmission distributor or dealer.

ode: MODE (Diagnostics) button or move the selector lever to

than the one where the diagnostic mode was entered.

E LISTINGS AND PROCEDURES

nts information about the diagnostic codes which may n of the transmission. For additional information, refer to ing Manual for WTEC III Controls

e condition that caused the code is still present, the code come active.

le 7. Code Listings And Procedures

QUICK CHECKS

Check:a. Battery direct ground and power connections are tight and

clean.b. Vehicle batteries are charged.c. Vehicle charging system