Introduction

INTRODUCTION

IN-1

HOW TO USE THIS MANUALINDEXAn INDEX is provided on the first page of each section to guide you to the item to be repaired.To assist you in finding your way through the manual, the Section Title and major heading aregiven at the top of every page.

GENERAL DESCRIPTIONAt the beginning of each section, a General Description is given that pertains to all repairoperations contained in that section.Read these precautions before starting any repair task.

PREPARATIONPreparation lists the SST (Special Service Tools), recommended tools, equipment, lubricant andSSM (Special Service Materials) which should be prepared before beginning the operation andexplains the purpose of each one.

REPAIR PROCEDURESMost repair operations begin with an overview illustration. It identifies the components andshows how the parts fit together.Example:

-INTRODUCTION HOW TO USE THIS MANUALIN-2

The procedures are presented in a step-by-step format:• The illustration shows what to do and where to do it.• The task heading tells what to do.• The detailed text tells how to perform the task and gives other information such as

specifications and warnings.Example:

Specifications are presented in bold type throughout the text where needed. You never have toleave the procedure to look up your specifications. They are also found at the end of each section,for quick reference.

This format provides the experienced technician with a FAST TRACK to the information needed.The upper case task heading can be read at a glance when necessary, and the text below itprovides detailed information. Important specifications and warnings always stand out in boldtype.

References have been kept to a minimum. However, when they are required you are given thepage to refer to.

REFERENCES

SPECIFICATIONS


CAUTIONS, NOTICES, HINTS:• CAUTIONS are presented in bold type, and indicate there is a possibility of injury to you or

other people.• NOTICES are also presented in bold type, and indicate the possibility of damage to the

components being repaired.• HINTS are separated from the text but do not appear in bold. They provide additional

information to help you perform the repair efficiently.

SI UNIT

The UNITS given in this manual are primarily expressed according to the SI UNIT (InternationalSystem of Unit), and alternately expressed in the metric system and in the English System.Example:Torque: 30 N �m (310 kgf �cm, 22 ft �lbf)


IDENTIFICATION INFORMATIONVEHICLE IDENTIFICATION NUMBERThe vehicle identification number is stamped on thevehicle identification number plate and certificationlabel.A. Vehicle Identification Number PlateB. Certification Label

ENGINE SERIAL NUMBERThe engine serial number is stamped on the engineblock as shown.

-INTRODUCTION IDENTIFICATION INFORMATIONIN-5

GENERAL REPAIR INSTRUCTIONS1. Use fender, seat and floor covers to keep the vehicle

clean and prevent damage.2. During disassembly, keep parts in the appropriate

order to facilitate reassembly.3. Observe the following:

CAUTION: Work must be started after 90 seconds fromthe time the ignition switch is turned to the ’LOCK’position and the negative (-) terminal cable is discon-nected from the battery (See page RS-2 ).

(a) Before performing electrical work, disconnectthe negative cable from the battery terminal.

(b) If it is necessary to disconnect the battery forinspection or repair, always disconnect the cablefrom the negative (-) terminal which is groundedto the vehicle body.

(c) To prevent damage to the battery terminal post,loosen the terminal nut and raise the cable strai-ght up without twisting or prying it.

(d) Clean the battery terminal posts and cable termi-nals with a clean shop rag. Do not scrape themwith a file or other abrasive objects.

(e) Install the cable terminal to the battery post withthe nut loose, and tighten the nut after installa-tion. Do not use a hammer to tap the terminalonto the post.

(f) Be sure the cover for the positive (+) terminal isproperly in place.

4. Check hose and wiring connectors to make sure thatthey are secure and correct.

5. Non-reusable parts(a) Always replace cotter pins, gaskets, O-rings and

oil seals etc. with new ones.(b) Non-reusable parts are indicated in the compo-

nent illustrations by the ”♦ ” symbol.

6. Precoated partsPrecoated parts are bolts and nuts, etc. that arecoated with a seal lock adhesive at the factory.(a) If a precoated part is retightened, loosened or

caused to move in any way, it must be recoatedwith the specified adhesive.

-INTRODUCTION GENERAL REPAIR INSTRUCTIONSIN-6

(b) When reusing precoated parts, clean off the oldadhesive and dry with compressed air. Thenapply the specified seal lock adhesive to the bolt,nut or threads.

(c) Precoated parts are indicated in the componentillustrations by the ”�” symbol.

7. When necessary, use a sealer on gaskets to preventleaks.

8. Carefully observe all specifications for bolt tighteningtorques. Always use a torque wrench.

9. Use of special service tools (SST) and special servicematerials (SSM) may be required, depending on thenature of the repair. Be sure to use SST and SSMwhere specified and follow the proper work proce-dure. A list of SST and SSM can be found in thepreparation part at the front of each section in thismanual.

10. When replacing fuses, be sure the new fuse has thecorrect amperage rating. DO NOT exceed the rating oruse one with a lower rating.


(b) To disconnect vacuum hoses, pull on the end, notthe middle of the hose.

(c) To pull apart electrical connectors, pull on theconnector itself, not the wires.

(d) Be careful not to drop electrical components,such as sensors or relays. If they are dropped ona hard floor, they should be replaced and notreused.

(e) When steam cleaning an engine, protect the dis-tributor, air filter, and VCV from water.

(f) Never use an impact wrench to remove or installtemperature switches or temperature sensors.

(g) When checking continuity at the wire connector,insert the tester probe carefully to prevent termi-nals from bending.

(h) When using a vacuum gauge, never force thehose onto a connector that is too large. Use astep-down adapter instead. Once the hose hasbeen stretched, it may leak.

13. Tag hoses before disconnecting them:(a) When disconnecting vacuum hoses, use tags to

identify how they should be reconnected.(b) After completing a job, double check that the

vacuum hoses are properly connected. A labelunder the hood shows the proper layout.

11. Care must be taken when jacking up and supportingthe vehicle. Be sure to lift and support the vehicle atthe proper locations (See page IN-17 ).(a) If the vehicle is to be jacked up only at the front

or rear end, be sure to block the wheels at theopposite end in order to ensure safety.

(b) After the vehicle is jacked up, be sure to supportit on stands. It is extremely dangerous to do anywork on a vehicle raised on a jack alone, even fora small job that can be finished quickly.

12. Observe the following precautions to avoid damage tothe parts:(a) Do not open the cover or case of the ECU, ECM,

PCM or TCM unless absolutely necessary. (If theIC terminals are touched, the IC may be destr-oyed by static electricity.)


14. Unless otherwise stated, all resistance is measured atan ambient temperature of 20�C (68�F). Because theresistance may be outside specifications if measuredat high temperatures immediately after the vehiclehas been running, measurements should be madewhen the engine has cooled down.


PRECAUTIONFOR VEHICLES EQUIPPED WITH SRSAIRBAG

The 1994 TERCEL is equipped with a SRS (Supple-mental Restraint System).Failure to carry out service operations in the correctsequence could cause the supplemental restraintsystem to unexpectedly deploy during servicing, pos-sibly leading to a serious accident.Further, if a mistake is made in servicing the supple-mental restraint system, it is possible the SRS may failto operate when required. Before performing servic-ing (including removal or installation of parts, inspec-tion or replacement), be sure to read the followingitems carefully, then follow the correct proceduredescribed in the repair manual.

Locations of Airbag Components

-INTRODUCTION PRECAUTIONIN-10

1. Malfunction symptoms of the supplemental restraintsystem are difficult to confirm, so the diagnostic trou-ble codes become the most important source of infor-mation when troubleshooting. When troubleshootingthe supplemental restraint system, always inspect thediagnostic trouble codes before disconnecting thebattery (See page RS-37 ).

2. Work must be started after 90 seconds from thetime the ignition switch is turned to the LOCK posi-tion and the negative (-) terminal cable is discon-nected from the battery.(The supplemental restraint system is equippedwith a back-up power source so that if work isstarted within 90 seconds of disconnecting the neg-ative (-) terminal cable of the battery, the SRS maybe activated.)When the negative (-) terminal cable is disconnectedfrom the battery, memory of the clock and audiosystems will be cancelled. So before starting work,make a record of the contents memorized by the audiomemory system. When work is finished, reset theaudio system as before and adjust the clock.To avoid erasing the memory of each memory system,never use a back-up power supply from outside thevehicle.

3. Even in cases of a minor collision where the SRS doesnot operate, the front airbag sensors and steeringwheel pad should be inspected (See page RS-14 ).

4. Never use airbag parts from another vehicle. Whenreplacing parts, replace them with new parts.

5. Before repairs, remove the airbag sensors if shocksare likely to be applied to the sensors during repairs.

6. Never disassemble and repair the front airbag sensors,center airbag sensor assembly or steering wheel padin order to reuse it.

7. If the front airbag sensors, center airbag sensor as-sembly or steering wheel pad have been dropped, or ifthere are cracks, dents or other defects in the case,bracket or connector, replace them with new ones.

8. Do not expose the front airbag sensors, center airbagsensor assembly or steering wheel pad directly to hotair or flames.

9. Use a volt/ohmmeter with high impedance (10 k�/Vminimum) for troubleshooting of the electrical circuit.

10. Information labels are attached to the periphery of theairbag components. Follow the instructions on thenotices.

-INTRODUCTION PRECAUTIONIN-1 1

Front Airbag Sensor1. Never reuse the front airbag sensors involved in a

collision when the airbag has deployed. (Replace bothleft and right airbag sensors.)

2. Install the front airbag sensor with the arrow on thesensor facing toward the front of the vehicle.

3. The front airbag sensor set bolts and nuts have beenanti - rust treated. When the sensor is removed,always replace the set bolt and nut with new ones.

4. The front airbag sensor is equipped with an electricalconnection check mechanism. Be sure to lock thismechanism securely when connecting the connector.If the connector is not securely locked, a malfunctioncode will be detected by the diagnosis system (Seepage RS-10 ).

Spiral Cable (in Combination Switch)The steering wheel must be fitted correctly to thesteering column with the spiral cable at the neutralposition, otherwise cable disconnection and other tro-ubles may result. Refer to page RS-16 of thismanual concerning correct steering wheel installation.

11. After work on the supplemental restraint system iscompleted, perform the SRS warning light check (Seepage RS-42 ).


Steering Wheel Pad (with Airbag)1. When removing the steering wheel pad or handling a

new steering wheel pad, it should be placed with thepad top surface facing up.In this case, the twin-lock type connector lock levershould be in the locked state and care should be takento place it so the connector will not be damaged. Anddo not store a steering wheel pad on top of anotherone. (Storing the pad with its metallic surface up maylead to a serious accident if the airbag inflates forsome reason.)

2. Never measure the resistance of the airbag squib.(This may cause the airbag to deploy, which is verydangerous.)

3. Grease should not be applied to the steering wheelpad and the pad should not be cleaned with deter-gents of any kind.

4. Store the steering wheel pad where the ambient tem-perature remains below 93�C (200�F), without highhumidity and away from electrical noise.

5. When using electric welding, first disconnect theairbag connector (yellow color and 2 pins) under thesteering column near the combination switch connec-tor before starting work.

6. When disposing of a vehicle or the steering wheel padalone, the airbag should be deployed using an SSTbefore disposal (See page RS-19 ). Perform the oper-ation in a place away from electrical noise.


Center Airbag Sensor Assembly1. Never reuse the center airbag sensor assembly in-

volved in a collision when the airbag has deployed.2. The connectors to the center airbag sensor assembly

should be connected or disconnected with the sensormounted on the floor. If the connectors are connect-ed or disconnected while the center airbag sensorassembly is not mounted to the floor, it could causeundesired ignition of the supplemental restraintsystem.

3. Work must be started after 90 seconds from the timethe ignition switch is turned to the LOCK position andthe negative (-) terminal cable is disconnected fromthe battery, even just loosing the set bolts of centerairbag sensor assembly.

Wire Harness and ConnectorThe supplemental restraint system wire harness isintegrated with the cowl wire harness assembly andluggage compartment wire harness assembly. Thewires for the airbag wire harness are encased in ayellow corrugated tube. All the connectors for thesystem are also a standard yellow color. If the supple-mental restraint system wire harness becomes dis-connected or the connector becomes broken due toan accident, etc., repair or replace it as shown page RS-33 .


FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTERCAUTION: If large amounts of unburned gasoline flow into the converter, it may overheat and createa fire hazard. To prevent this, observe the following precautions and explain them to your customer.

1. Use only unleaded gasoline.2. Avoid prolonged idling.

Avoid running the engine at idle speed for more than 20 minutes.3. Avoid spark jump test.

(a) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.(b) While testing, never race the engine.

4. Avoid prolonged engine compression measurement.Engine compression tests must be done as rapidly as possible.

5. Do not run engine when fuel tank is nearly empty.This may cause the engine to misfire and create an extra load on the converter.

6. Avoid coasting with ignition turned off and prolonged braking.7. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.


IF VEHICLE IS EQUIPPED WITH MOBILECOMMUNICATION SYSTEM

For vehicles with mobile communication systemssuch as two-way radios and cellular telephones, ob-serve the following precautions.(1) Install the antenna as far as possible away from the

ECM, ECU and sensors of the vehicle’s electronicsystem.

(2) Install the antenna feeder at least 20 cm (7.87 in.)away from the ECM, ECU and sensors of the vehicle’selectronics systems. For details about ECM, ECU andsensors locations, refer to the section on the applica-ble component.

(3) Do not wind the antenna feeder together with theother wiring. As much as possible, also avoid runningthe antenna feeder parallel with other wire harnesses.

(4) Confirm that the antenna and feeder are correctlyadjusted.

(5) Do not install powerful mobile communicationssystem.


VEHICLE LIFT AND SUPPORT LOCATIONS

-INTRODUCTION VEHICLE LIFT AND SUPPORT LOCATIONSIN-17

ABBREVIATIONS USED IN THISMANUAL

Load Sensing Proportioning Valve

Supplemental Restraint System

Positive Crankcase Ventilation

Emergency Locking Retractor

Automatic Locking Retractor

Integrated Ignition Assembly

Automatic Transmission Fluid

Electronic Spark Advance

Exhaust (Manifold, Valve)

Before Top Dead Center

Special Service Materials

Intake (Manifold, Valve)

Outer Vent Control Valve

Constant Velocity Joint

Formed in Place Gasket

Child Restraint System

Electronic Control Unit

Light Emitting Diode

Special Service Tools

Automatic Transaxle

Manual Transaxle

Power Steering

Junction Block

Circuit Breaker

Parking Brake

Spark Control

Multipurpose

Right-Hand

Fusible Link

Left-Hand

OverdriveO/D, OD

Maximum

California

Dash Pot

Minimum

Standard

Oversize

Ignition

Except

Switch

ovcv

LSPV

BTDC

Front

Calif.

FIPG

o/s

Rear

J/B

PKB

Min.

ALR

M/T

Max.

PCV

CVJ

A/T

STD

SSM

ELR

ATF

ESA

ECU

SRS

CRS

SST

LED

Ex.

IIA

CB

DP

EX

-INTRODUCTION ABBREVIATIONS USED IN THIS MANUALIN-18

Vacuum Transmitting Valve

Vacuum Switching Valve

Vacuum Control Valve

Top Dead Center

Temperature

Transmission

Undersize

Without

TEMP.

W/O

With

T/M

U/Svcv

TDC

vsvVTV

-INTRODUCTION ABBREVIATIONS USED IN THIS MANUALIN-19

GLOSSARY OF SAE AND TOYOTA TERMSThis glossary lists all SAE-J1930 terms and abbreviations used in this manual in compliancewith SAE recommendations, as well as their Toyota equivalents.

Electrically Erasable Programmable Read Only Memory

(EEPROM),

Erasable Programmable Read Only Memory (EPROM)

1: Check Connector

2: Toyota Diagnosis Communication Link (TDCL)

3: OBD ll Diagnostic Connector

Electrically Erasable Programmable Read Only

Memory

Flash Electrically Erasable ProgrammableRead Only Memory

Data Link Connector 1



Cold Mixture Heater (CMH), Heat Control Valve (HCV)

Flash Erasable Programmable Read Only Memory

Coolant Temperature, Water Temperature (THW)

Programmable Read Only Memory (PROM)Erasable Programmable Read Only Memory

TOYOTA TERMS( )——ABBREVIATIONS

Evaporative Emission Control (EVAP)

Engine ECU (Electronic Control Unit)

Toyota Distributorless Ignition (TDI)

Exhaust Gas Recirculation (EGR)

Heated Oxygen Sensor (H02S)

Direct Fuel Injection (Diesel)

Engine Coolant Temperature

SAE ABBREVI-ATIONS

Engine Modification (EM)

Continuous Fuel Injection

Continuous Trap Oxidizer

Exhaust Gas Recirculation

Diagnostic Trouble Code

Battery Positive Voltage

Secondary Air Injection

Heated Oxygen Sensor

Closed Throttle Position

Early Fuel Evaporation

Engine Control Module

Diagnostic Test Mode

Evaporative Emission

Direct Injection (DI)

+B, Battery Voltage

Clutch Pedal Position

Engine Control Level

Barometric Pressure

Engine Modification

Distributor Ignition

Crankshaft Position

Electronic Ignition

Charge Air Cooler

DLC1

DLC2

DLC3

Idle ON (IDL ON)

Air Injection (AI)

Camshaft Position

Accelerator Pedal

Air Conditioning

Diagnostic Code

Ground (GND)

Air Conditioner

SAE TERMS

Closed Loop Closed Loop

Crank Angle

Flexible Fuel

Fuel Pump Fuel Pump

Fan Control

Cam Angle

Air Cleaner

Intercooler

Air Cleaner

Carburetor Carburetor

AlternatorGenerator

FEEPROM

H02S

FEPROM

EEPROM

Ground

EPROM

CARB

EVAP

CTOX

BARO

CMP

A/C

GND

CKP

CPP

DTM

CTP

GEN

ECM

ECL

CAC

DTC

ACL

EGR

AIR

ECT

DFI

CFI

EFE

-INTRODUCTION GLOSSARY OF SAE AND TOYOTA TERMSIN-20

Electric Bleed Air Control Valve (EBCV)

Mixture Control Valve (MCV)

Electric Air Control Valve (EACV)

Diesel Particulate Filter (DPF)

Diesel Particulate Trap (DPT)

Electronic Fuel Injection (EFI), Sequential Injection

Single Point Injection

Central Fuel Injection (Ci)

Transmission ECU (Electronic Control Unit)

Oxidation Catalyst Converter (OC), CCo

Non-V olatile Random Access Memory

Sequential Multiport Fuel Injection

Programmable Read Only Memory

Manifold Pressure

Intake Vacuum

Random Access Memory (RAM)

Oxygen Sensor, O2 Sensor (O2S)

Intake or Inlet Air Temperature

Pulsed Secondary Air Injection

Manifold Surface Temperature

Electronic Fuel Injection (EFI)

On -Board Diagnostic (OBD)

Oxidation Catalytic Converter

Throttle Body Fuel Injection

Malfunction Indicator Lamp

Manifold Differential Pressure

Transmission Control Module

Read Only Memory (ROM)

Service Reminder Indicator

Manifold Absolute Pressure

Powertrain Control Module

Ignition Control Module

Torque Converter Clutch

Power Steering Pressure

Idle Speed Control (ISC)

Random Access Memory

Multiport Fuel Injection

Intake Air Temperature

System Readiness Test

Periodic Trap Oxidizer

Indirect Fuel Injection

Manifold Vacuum Zone

Park/Neutral Position

On-Board Diagnostic

Supercharger Bypass

Transmission Range

Check Engine Light

Inertia Fuel-Shutoff

Read Only Memory

Idle Speed Control

Smoke Puff Limiter

Torque Converter

Indirect Injection

Air Suction (AS)

Throttle Position Throttle Position

Oxygen Sensor

Mixture Control

Idle Air Control

Air Flow Meter

Turbocharger

Engine Speed

Turbocharger

Engine Speed

Throttle BodyThrottle Body

Relay Module

Mass Air Flow

Supercharger Supercharger

Knock Sensor Knock Sensor

Open LoopOpen Loop

Scan Tool

NVRAM

PROM

PTOX

MDP

PAIR

MAP

OBD

ROM

PCM

TCM

PNP

RPM

O2S

RAM

SCB

MAF

PSP

MVZ

SPL

MST

MIL

ICM

MFI

SRT

TCC

IAC

TBI

SRI

ISC

IAT

SFI

IFS


Bimetallic Vacuum Switching Valve (BVSV)

Thermostatic Vacuum Switching Valve (TVSV)

Three-W ay Catalytic (TWC)

CCRO

Three-W ay + Oxidation Catalytic Converter

Vehicle Speed Sensor (Read Switch Type)

Warm Up Three-Way Catalytic Converter

Warm Up Oxidation Catalytic Converter

Three -Way Catalytic Converter

Thermal Vacuum Valve

Vehicle Speed Sensor

Wide Open Throttle

Voltage Regulator

Manifold Converter

Voltage Regulator

Volume Air Flow Air Flow Meter

Full Throttle

Fourth Gear

CCR + CCo

Third Gear

WU-TWC

TWC+OC

WU-OC

WOT

TWC

4GR

TVV

VAF

3GR

vss


Introduction

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