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IN-18 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
IN01T-19
GENERAL INFORMATION
A large number of ECU controlled systems are used in the TOYOTA TUNDRA. In general, ECU controlled
systems are considered to be a very intricate, requiring a high level of technical knowledge to troubleshoot.
However, following the problem checking procedures of the ECU controlled system's circuits carefully is not
complex. If you have an adequate understanding of the system and a basic knowledge of electricity, accu-
rate diagnosis and necessary repair can be performed.
This manual emphasizes the above standpoint to help service technicians perform accurate and effective
troubleshooting. Detailed information on major ECU controlled systems in this vehicle are outlined below:
System Page
1. Engine 1GR-FE DI-1
2. Engine 2UZ-FE DI-420
3. Automatic Transmission A750E for 1GR-FE DI-943
4. Automatic Transmission A750E/A750F for 2UZ-FE DI-1108
5. Tire Pressure Warning System DI-1280
6. Anti-Lock Brake System DI-1383
7. ABS with EBD & BA & TRAC & VSC System DI-1456
8. Can Communication System DI-1693
9. Supplemental Restraint System DI-1810
10. TOYOTA Vehicle Intrusion Protection System DI-2297
11. Cruise Control System DI-2341
12. Sliding Roof System DI-2376
13. Body Control System DI-2391
14. Driver Door Control System DI-2453
15. Passenger Door Control System DI-2475
16. Multiplex Communication System DI-2495
17. Audio System DI-2519
18. Rear Seat Audio System DI-2633
19. Rear Seat Entertainment System DI-2669
20. Navigation System DI-2753
FOR USING OBD II SCAN TOOL OR HAND-HELD TESTER
S Before using the tester, read its user manual thoroughly.
S Connect the cable of the tester to DLC3, turn the ignition switch ON and operate the tester. If the tester
cannot communicate with the ECU controlled system, there is a problem on the vehicle side or tester
side.
(1) If communication is normal when the tester 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 tester is connected to another vehicle, the problem
lies in the tester. Perform the Self Test procedures outlined in the Tester Operator's Manual.
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