Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne in httecsy geninf

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                                            INTRODUCTION   -   HOW TO TROUBLESHOOT ECU CONTROLLED       IN-17
                                                               SYSTEMS


HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
                                                                                                         IN05Y-35


GENERAL INFORMATION
A large number of ECU controlled systems are used in the 4RUNNER. In general, the ECU controlled system
is considered to be a very intricate system requiring a high level of technical knowledge and expert skill to
troubleshoot. However, the fact is 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 a basic knowledge
of electricity, 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 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. Engine                                                                             DI-1
2. Automatic Transmission                                                            DI-157
3. ABS with EBD & BA & TRAC & VSC System                                             DI-221
4. Supplemental Restraint System                                                     DI-375
5. Cruise Control System (DENSO Made)                                                DI-469
6. Engine Immobiliser System                                                         DI-489
7. Body Control System                                                               DI-51 1
8. Back Door Control System                                                          DI-551
9. Air Conditioning System                                                           DI-576

FOR USING OBD II SCAN TOOL OR HAND-HELD TESTER
 S  Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should
    be read thoroughly.
 S  If the scan tool or tester cannot communicate with ECU controlled systems when you have connected
    the cable of the scan tool or tester to DLC3, turned the ignition switch ON and operated the scan tool,
    there is a problem on the vehicle side or tool side.
    (1) If communication is normal when the tool is connected to another vehicle, inspect the diagnosis
           data link line (Bus line) or ECU power circuit of the vehicle.
    (2) If communication is still not possible when the tool is connected to another vehicle, the problem
           is probably in the tool itself, so perform the Self Test procedures outline in the Tester Operator's
           Manual.




 2002 4RUNNER (RM887U)

                                                                    Author :            Date :            17

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