Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 01 20549 intrinf
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INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-25
SYSTEMS
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
01044-23
GENERAL INFORMATION
There are many ECU controlled systems used in the SIENNA. In general, ECU controlled systems are con-
sidered to be very intricate and require a high level of technical knowledge and expert skill to troubleshoot.
The fact is, however, that if you proceed by inspecting the circuits one by one, troubleshooting of these sys-
tems is not complex. If you have adequate understanding of the system and basic knowledge of electricity,
the problem can be accurately diagnosed and fixed. This manual is designed based on the above principle
to help service technicians perform accurate and effective troubleshooting, and is compiled for the following
major ECU controlled systems:
The troubleshooting procedures are described on the following pages.
System Page
1. SFI System 05-1
2. Tire Pressure Warning System 05-344
3. ABS with EBD System 05-383
4. ABS with EBD & BA & TRAC & VSC System 05-431
5. Electronically Controlled Automatic Transmission [ECT] 05-528
6. Air Conditioning System 05-634
7. Supplemental Restraint System 05-758
8. Lighting System 05-1117
9. Audio System 05-1186
10. Navigation System 05-1256
11. Rear Seat Audio System 05-1403
12. Rear Seat Entertainment System 05-1417
13. Back Monitor System 05-1472
14. TOYOTA Park Assist System 05-1484
15. Combination Meter 05-1525
16. Power Window Control System (w/ jam protection) 05-1553
17. Power Door Lock Control System 05-1586
18. Slide Door Closer System 05-1627
19. Power Slide Door System 05-1647
20. Back Door Closer System 05-1732
21. Power Back Door System 05-1749
22. Wireless Door Lock Control System 05-1790
23. Key Reminder Warning System 05-1817
24. Engine Immobilizer System 05-1831
25. Theft Deterrent System 05-1858
26. Multiplex Communication System 05-1876
27. CAN Communication System 05-1931
28. Cruise Control System 05-1961
29. Dynamic Laser Cruise Control System 05-1985
Author : Date : 25
01-26 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
FOR USING OBDII 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 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 (Bus line) or ECU power circuit of the vehicle.
(2) If communication is still impossible when the tester is connected to another vehicle, the problem
is probably in the tester itself, so perform the self test procedures outlined in the Tester Operator's
Manual.
Author : Date : 26
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