PSP Switch Signal Circuit Troubleshooting
PSP Switch Signal Circuit Troubleshooting
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 step 4.
NO -
Go to step 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.�
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
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.�
NO -
Go to step 10.
10. Turn the ignition switch to LOCK (0).
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector A (49P).
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 (A38) and the PSP switch.�
NO -
Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair.�
14. Turn the ignition switch to LOCK (0).
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.
17. Check the PSP SWITCH in the DATA LIST with the HDS.
Does it change to ON?
YES -
Replace the PSP switch.�
NO -
Go to step 18.
18. Turn the ignition switch to LOCK (0).
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 (49P).
22. Check for continuity between ECM/PCM connector terminal A38 and PSP switch 2P connector terminal No. 1.
Is there continuity?
YES -
Go to step 23.
NO -
Repair open in the wire between the PSP switch and the ECM/PCM (A38).�
23. 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 ECM/PCM Update, or substitute a known-good ECM/PCM Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair.�
NO -
Repair open in the wire between the PSP switch and G201 Harness Locations.�