PSP Switch Signal Circuit Troubleshooting
PSP Switch Signal Circuit Troubleshooting1. Turn the ignition switch ON (II).
2. Measure voltage between PCM connector terminals A26 and B20.
Is there less than 1.0 V?
YES - Go to step 3.
NO - Go to step 6.
3. Start the engine.
4. Turn the steering wheel to the full lock position.
5. Measure voltage between PCM connector terminals A26 and B20.
Is there battery voltage?
YES - The PSP switch signal is OK.
NO - Go to step 11.
6. Turn the ignition switch OFF.
7. Disconnect the PSP switch 2P connector.
8. Turn the ignition switch ON (II).
9. At the harness side, connect PSP switch 2P connector terminals No.1 and No.2 with a jumper wire.
10. Measure voltage between PCM connector terminals A26 and B20.
Is there less than 1.0 V?
YES - Replace the PSP switch.
NO - Check for an open in the wire between the PCM (A26) and the PSP switch or, an open in wire between the PSP switch and G503.
11. Turn the ignition switch OFF.
12. Disconnect the PSP switch 2P connector.
13. Turn the ignition switch ON (II).
14. Measure voltage between PCM connector terminals A26 and B20.
Is there battery voltage?
YES - Replace the PSP switch.
NO - Go to step 15.
15. Turn the ignition switch OFF.
16. Disconnect PCM connector A (32P).
17. Check for continuity between body ground and PCM connector terminal A26.
Is there continuity?
YES - Repair short in the wire between the PCM (A26) and the PSP switch.
NO - Substitute a known-good PCM and recheck. If voltage is normal, replace the original PCM.