Toyota ST185 Series User Manual

FOREWORD
This wiring diagram has been prepared to provide information
on the electrical system of the 1990 TOYOTA CELICA
All–Trac/4WD.
Applicable models: ST185 Series
For service specifications and repair procedures of the above
models other than those listed in this manual, refer to the
following manuals;
Manual Name Pub. No.
 1990 Celica Repair Manual
 1990 Celica All–Trac/4WD Repair
Manual Supplement
 1990 Celica New Car Features
RM149U
RM176U
NCF056U
All information in this manual is based on the latest product
information at the time of publication. However, specifications
and procedures are subject to change without notice.
TOYOTA MOTOR CORPORATION
This vehicle has an SRS AIRBAG (referred to as the airbag in the remainder
of this manual).
When handling airbag components (removal, installation or inspection, etc.),
always follow the directions given in the repair manuals listed above to
prevent the occurrence of accidents and airbag malfunction.
NOTICE

Toyota ST185 Series Specifications

General

Brand	Toyota
Model	ST185 Series
Category	Automobile
Language	English

Summary

FOREWORD

HOW TO USE THIS MANUAL

POWER SOURCE (Current Flow Chart)

GROUND POINTS

TROUBLESHOOTING

Voltage Check

Procedure for checking voltage at specific points in electrical circuits.

Continuity and Resistance Check

Methods for checking circuit continuity and resistance using an ohmmeter.

Finding a Short Circuit

Steps to locate a short circuit using a test light and connector manipulation.

RELAY LOCATIONS

ELECTRICAL WIRING ROUTING

Engine Compartment Wiring

Instrument Panel Wiring

Body Wiring

STARTING AND IGNITION

CHARGING

ENGINE CONTROL

Input Signals

Details the various sensor inputs received by the ECU for engine control.

Control System

Explains the EFI, ESA, and Fuel Pump control systems managed by the ECU.

Diagnosis System

ABS (ANTI–LOCK BRAKE SYSTEM)

SRS AIRBAG

Notice

Important safety precautions and warnings for inspecting and repairing the SRS Airbag system.

System Outline

RADIATOR FAN AND AIR CONDITIONER (AUTOMATIC AIR CONDITIONER, FOR PUSH TYPE OF BLOWER CONTROL SW)

System Outline

GROUND POINT