RL V6-3.7L (2009)
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 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 PCM connector E (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 the PCM (E17) and the PSP switch.
NO - Update the PCM if it does not have the latest software, See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Programming and Relearning/PCM Update or substitute a known-good PCM, See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a
known-good PCM, replace the original PCM. See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service
and Repair
