| 1. | Start the engine, and let it idle. |
| 2. | Align the steering wheel straight ahead. |
| 3. | Check the PSP SWITCH in the DATA LIST with the HDS. Does it indicate ON? YES - Go to 4. NO - Go to 14. |
| 4. | Turn the steering wheel to the full lock position. |
| 5. | Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES - The PSP switch signal circuit is OK.n NO - Go to 6. |
| 6. | Turn the ignition switch OFF. |
| 7. | Disconnect the PSP switch 2P connector. |
| 8. | Start the engine. |
| 9. | Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES - Replace the PSP switch.n NO - Go to 10. |
| 10. | Turn the ignition switch OFF. |
| 11. | Jump the SCS line with the HDS. |
| 12. | Disconnect ECM/PCM connector A (44P). |
| 13. | Check for continuity between PSP switch 2P connector terminal No. 1 and body ground.
Is there continuity? YES - Repair short in the wire between the ECM/PCM (A22) and the PSP switch.n NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n |
| 14. | Turn the ignition switch OFF. |
| 15. | Disconnect the PSP switch 2P connector. |
| 16. | Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then start the engine.
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| 17. | Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to ON? YES - Replace the PSP switch.n NO - Go to 18. |
| 18. | Turn the igniton switch OFF. |
| 19. | Remove the jumper wire from the PSP switch 2P connector. |
| 20. | Jump the SCS line with the HDS. |
| 21. | Disconnect ECM/PCM connector A (44P). |
| 22. | Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.
|
| 23. | Check for continuity between body ground and ECM/PCM connector terminal A22.
Is there continuity? YES - Go to 24. NO - Repair open in the wire between the PSP switch and the ECM/PCM (A22).n |
| 24. | Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.
Is there continuity? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.n NO - Repair open in the wire between the PSP switch and body ground (LHD: G401, RHD: G201).n |