TL V6-3.2L (2004)
Power Steering Pressure Switch: Testing and Inspection
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 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.
NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector A (31P).
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 ECM/PCM (A17) and the PSP switch.
NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If symptom/indication
goes away with a known-good ECM/PCM, replace the original ECM/PCM.
14. Turn the ignition switch OFF.
15. Disconnect the PSP switch 2P connector.
