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Bulletin No. : ISB-2001002

Date : JULY 8. 2001

Component

category: 05-TRANSMITTION

Bulletin Group : TECHNICAL

Distribution : WORLD WIDE

SUBJECT : Trouble Shooting of BTRA A/T LIMP HOME MODE

MODELS : MUSSO & KORANDO with the BTRA A/T.

CONDITION:

In some case, BTRA A/T goes into limp home(LHM) mode. SYMC found that

it is caused by electrical defects.

CORRECTION :

The electrical damage is various. But to clear this possibility, SYMC changedthe wiring route and improved wiring harness protection.

There is the procedure how to check the BTRA A/T LHM.

Definition

LIMP HOME MODE : When Input signal of TCU( Transmission control unit) is abnormal,

the transmission is limited to 3rd gear only to protect the A/T.

- Vehicle starting is very difficult.(engine rpm rise up to 3,000)

- High speed is limited up to 80km/h)

- Gear shifting is impossible.

Check Procedure

1) Solenoid 5 malfunction

a. Check fault code. (The fault code is P1737 )

This service bulletin is intended for internal use only. All information, illustrations and specifications contained in this bulletin are

based on the latest product information available at the time of issue.

International A/S, Parts Team

Tel: 82-31-610-1400

Fax: 82-31-610-3733

E-mail:[email protected]

Printed in Korea

SSANGYONG MOTOR COMPANY

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b. Unplugged 10 pin plug of auto transmission.

c. Check resistance between terminal 5 and terminal 8 of 10 pin plug.

Standard value : 3.6 ~ 5.5

d. If measured value is within specification, it is caused by wiring harness problem.

e. Separate TCU connector and keep the 10 pin plug in unplugged.

f. Check resistance between each terminal of TCU 14 pin connector and ground.

* The TCU of Musso is under the co-driver's seat

- If resistance is measured, the wiring terminal is shorted.



unplugged

driver's seat

disconnected

MultiTester

Male plug of T/M side

MultiTester

Ground(body)

B1 B2 B3 B4 B5 B6

B7 B8 B9 B10 B11 B12 B13 B14

each pin


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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g. Check the change of resistance between B1 and B7 shaking A/T wiring and internal wiring.

- If resistance is variable, the solenoid 5 wiring of 14 pin connector is damaged.

caution : After rework, trouble code stored in TCM must be erased by scan-tool.

2) solenoid 1,2,3,4,6,7 malfunction

a. Check fault code.

Possible Cause

Solenoid 1

P1734 Solenoid 2

P1735 Solenoid 3

P1736 Solenoid 4

P1738 Solenoid 6

P1739 Solenoid 7

b. Unplugged 10 pin plug of auto transmission.

c. Check resistance between each terminal of 10 pin plug and ground.

Standard value : 28 2



fault code

P1733

MultiTester

B1 B2 B3 B4 B5 B6

B7 B8 B9 B10 B11 B12 B13 B14

MultiTester

unplugged

ground

eachpin

Male plug of T/M side


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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d. If the check value is within specification, the cause is wiring harness problem.

e. Connect 10 pin plug and disconnect TCU plug.

f. Check the change of resistance between each solenoid terminal of TCU 14 pin

connector to ground shaking A/T wiring and TCU wiring.

If resistance is changed, the shaken wiring is damaged.

caution : If 10 pin plug of A/T is unplugged or loosen,

scanner has many fault code(solenoid fault code).

After rework, trouble code stored in TCM must be erased by scan-tool.

3) vehicle speed sensor signal malfunction

a. Check the fault code.

(The fault code is 1704)

b. Check the lack of oil.

If oil is lack, oil pressure is not made enough in the A/T at high speed driving or

corner driving. And then, engine power is reduced, and the vehicle speed signal

into the TCU is abnormal. In this case, vehicle driving is difficult. And if the wheel

is full turned to left or right, power is not transmitted.



B1 B2 B3 B4 B5 B6

B7 B8 B9 B10 B11 B12 B13 B14

MultiTesterGround body)

B3(sol1), B11(sol2), B10(sol3)B4(sol4), B12(sol6), B9 (sol7)


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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c. Check the speed meter.

- normal :Refer to below item 'd'

- malfunction : check T/C speed sensor, connecting condition of speed meter connector,

terminal 16 of speed meter connector, and speed sensor wiring harness

d. Check AUTO DR LOCKING system at 50Km/h

- normal :Refer to below item 'e'

- malfunction : Check connection of speed meter connector,

terminal 17 of speed meter connector(wiring side),

wiring harness from speed meter connector to TCU,

wiring harness from speed meter connector to STICS

e. Unplugged speed meter connector and 30 pin connector of TCU.

f. Check resistance between terminal 17 of speed meter connector and body ground.

(Female plug of wiring side)

If resistance is measured, the ground is shorted.

caution : After rework, trouble code stored in TCM must be erased by scan-tool

Trouble shooting

action

re-routing



symptom possible cause

TCU wiring is pressed by front LH mount'g

area of co-driver's seat

solenoid 5

malfunction

SPEED SENSOR

CLUSTER REAR SIDE OF MUSSO

SPEED METER CONNECTOR

unplugged

28 27 26 25 24 26 22 21

13 14 15 16 17 18 19 20

28 27 26 25 24 26 22 21

13 14 15 16 17 18 19 20

cluster rear side of MUSSOMulti

Tester

ground body)

unplugged

PIN number


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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action

taping and re-routing

Tighten the connector


re-routing



Wiring is shorted by interference with lower

corner of center console bracket

10 pin connector(it is

assemble to A/T left side)

is disconnected

Solenoid 4 wiring is shorted by interference

with T/C

A/T wiring is pressed by T/C at wiring

bending route.

solenoid 3, 7

malfunction/short

solenoid 4 short


solenoid 5malfunction

loosen orunplugged


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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action


Tighten the connector

re-fit and oil

replacement speed sensor

Improvement history

Improvement

Short of

innerwiring Protection sheet extended

Short of

wiring

harness in

I/P console

bracket

Pad added in the console

bracket corner



Terminal 16 of speed meter connector isdisconnected.

Oil is leaked at matching point between the oil

cooler outlet port and the hose(co-driver side)

Speed sensor is shorted

After

Corrugate tube of T/M wiring

is extended ( korando)

before

Wiring harness is shorted by interference

with audio mt'g bracket(rear)

Short of

T/M wiring


Vehicle speed sensor

malfunction


Tel: 82-31-610-1400

Fax: 82-31-610-3733


Printed in Korea


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