General Information
WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
A large number of ECU controlled systems are used in the 4RUNNER. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. However, most problem checking procedures only involve inspecting the ECU controlled system's circuits one by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform effective troubleshooting, accurate diagnoses and necessary repairs. Detailed information and troubleshooting procedures on major ECU controlled systems in this vehicle are outlined below:
TROUBLESHOOT ECU CONTROLLED SYSTEMS GENERAL INFORMATION
| System | Reference |
|---|---|
| 1. SFI System (1GR-FE) | PRECAUTION |
| 2. SFI System (2UZ-FE) | PRECAUTION |
| 3. Tire Pressure Warning System | PRECAUTION |
| 4. Rear Air Suspension System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 5. ABS with EBD & BA & TRAC & VSC System | PRECAUTION |
| 6. Electronically Controlled Automatic Transmission [ECT] ((A750E/A750F)(1GR-FE)) | PRECAUTION |
| 7. Electronically Controlled Automatic Transmission [ECT] ((A750E/A750F)(2UZ-FE)) | PRECAUTION |
| 8. Air Conditioning System | AIR CONDITIONING SYSTEM (From August, 2004) HOW TO PROCEED WITH TROUBLESHOOTING |
| 9. Supplemental Restraint System | PRECAUTION |
| 10. Lighting System | PRECAUTION |
| 11. Wiper & Washer System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 12. Audio System | LOCATION |
| 13. Navigation System | LOCATION |
| 14. Back Monitor System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 15. Combination Meter | HOW TO PROCEED WITH TROUBLESHOOTING |
| 16. Power Window Control System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 17. Back Door Power Window Control System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 18. Power Door Lock Control System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 19. Back Door Closer System | BACK DOOR CLOSER SYSTEM |
| 20. Wireless Door Lock Control System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 21. Key Reminder Warning System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 22. Engine Immobilizer System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 23. Theft Deterrent System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 24. Multiplex Communication System | HOW TO PROCEED WITH TROUBLESHOOTING |
| 25. Can Communication System | PRECAUTION |
| 26. Cruise Control System | HOW TO PROCEED WITH TROUBLESHOOTING |
FOR USING OBD II SCAN TOOL OR 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 the ECU controlled systems when you have connected the cable of the tester to the DLC3 with the ignition switch and tester turned ON, there is a problem on the vehicle side or tester side.
- 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.
- 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.