01044–02
01–20
–INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
20Author: Date:
2002 CAMRY REPAIR MANUAL (RM881U)
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in CAMRY. In general, the ECU controlled system is
considered to be a very intricate system requiring high level of technical knowledge and expert skill to trou-
bleshoot. The fact is, however, that if you proceed to inspect the circuits one by one, troubleshooting of these
systems is not complex. If you have adequate understanding of the system and basic knowledge of electric-
ity, accurate diagnosis and necessary repair can be performed to locate and fix the problem. This manual
is designed through emphasis of the above standpoint to help service technicians perform an accurate and
effective troubleshooting, and is compiled for the following major ECU controlled systems.
The troubleshooting procedure and how to make use of it are described on the following pages.
System Page
1. SFI System (2AZ–FE) 05–1
2. SFI System (1MZ–FE) 05–173
3. ABS with EBD System (BOSCH made) 05–360
4. ABS with EBD System (DENSO made) 05–401
5. ABS with EBD & BA & TRAC & VSC System 05–448
6. Electronic Controlled Automatic Transmission [ECT] 05–548
7. Air Conditioning System 05–616
8. Supplemental Restraint System 05–687
9. Lighting System 05–896
10.Audio System 05–928
11.Navigation System 05–991
12.Combination Meter 05–1070
13.Power Door Lock Control System 05–1132
14.Wireless Door Lock Control System 05–1148
15.Engine Immobiliser System 05–1165
16.Theft Deterrent System 05–1182
17.Body Multiplex Communication System 05–1196
18.Cruise Control System 05–1209
19.Power Window Control System 05–1239
FOR USING OBDII SCAN TOOL OR HAND–HELD TESTER
HINT:
Before using the scan tool or tester, the scan tool’s instruction book or tester’s operator manual should
be read thoroughly.
If the scan tool or tester cannot communicate with the ECU controlled systems when you have con-
nected the cable of the tester to the DLC3 with the ignition switch and tester turned ON, there is a prob-
lem on the vehicle side or tester side.
(1) If the communication is normal when the tester is connected to another vehicle, inspect the diag-
nosis data link line (Busline) or ECU power circuit of the vehicle.
(2) If the communication is still impossible when the tester is connected to another vehicle, the prob-
lem is probably in the tester itself, so perform the Self Test procedures outlined in the Tester Oper-
ator’s Manual.
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