PSP Switch Signal Circuit Troubleshooting
PSP Switch Signal Circuit Troubleshooting1. 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.
Is OFF indicated?
YES - Go to step 4.
NO - Go to step 12.
4. Turn the steering wheel to the full lock position.
5. Check the PSPSW in the DATA LIST with the HDS.
Does it change to ON?
YES - The PSP switch signal circuit is OK.
NO - Go to step 6.
6. Disconnect the PSP switch 2P connector.
7. Check the PSPSW in the DATA LIST with the HDS.
Does it change to ON?
YES - Replace the PSP switch, and recheck.
NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (56P).
11. 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 PSP switch connector and the PCM, then recheck.
NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If symptom/indication goes away with a known-good PCM, replace the original PCM.
12. Turn the ignition switch OFF.
13. Disconnect the PSP switch 2P connector.
14. Connect the PSP switch 2P connector terminals No.1 and No.2 with a jumper wire, then start the engine.
Does the PSP SWITCH in the DATA LIST indicate OFF?
YES - Replace the PSP switch, and recheck.
NO - Go to step 15.
15. Turn the ignition switch OFF.
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector B (56P).
18. Check for continuity between PCM connector terminal B55 and PSP switch 2P connector terminal No.1.
Is there continuity?
YES - Go to step 19.
NO - Repair open in the wire between the PSP switch connector and the PCM, then recheck.
19. Check for continuity between PSP switch 2P connector terminal No.2 and body ground.
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Repair open in the wire between the PSP switch connector and body ground (G503), then recheck.