General Information

A large number of ECU controlled systems are used in the PRIUS. 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

6. Engine

DI—1

7. Hybrid Vehicle Control System

DI-179

8. HV Battery Control System

DI—317

9. Anti-Lock Brake System With EBD & RBS

DI—361

10.Electric Motor Power Steering

DI—462

11 .Supplemental Restraint System

DI—507

12.Cruise Control System

DI—653

13.Combination Meter System

DI—675

14.Body Control System

DI—690

15.Driver Door Control System

DI—742

16.Multiplex Communication System

DI—762

17.Navigation System

DI—801

18.Air Conditioning System

DI—876

FOR USING OBD II SCAN TOOL OR TOYOTA HAND-HELD TESTER

• Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should

FOR USING OBD II SCAN TOOL OR TOYOTA HAND-HELD TESTER

• 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 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.

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