DTC Troubleshooting

DTC Troubleshooting: P0523

DTC P0523: Rocker Arm Oil Pressure Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II).

2. Check the ROCKER ARM OIL PRESSURE SENSOR in the DATA LIST with the HDS.

Is there about 4.79 V or more?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the rocker arm oil pressure sensor 3P connector.

5. Connect rocker arm oil pressure sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.






6. Turn the ignition switch to ON (II).

7. Check the ROCKER ARM OIL PRESSURE SENSOR in the DATA LIST with the HDS.

Is there about 4.79 V or more?
YES - Go to step 8.

NO - Go to step 18.


8. Remove the jumper wire.

9. Measure the voltage between rocker arm oil pressure sensor 3P connector terminals No. 1 and No. 3.

Is there about 5 V?
YES - Go to step 14.

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 C (49P).

13. Check for continuity between PCM connector terminal C15 and rocker arm oil pressure sensor 3P connector terminal No. 3.

Is there continuity?
YES - Go to step 26.

NO - Repair open in the wire between the PCM (C15) and the rocker arm oil pressure sensor, then go to step 20.






14. Turn the ignition switch to LOCK (0).

15. Jump the SCS line with the HDS.

16. Disconnect PCM connector C (49P).

17. Check for continuity between PCM connector terminal C22 and rocker arm oil pressure sensor 3P connector terminal No. 2.

Is there continuity?
YES - Go to step 26.

NO - Repair open in the wire between the PCM (C22) and the rocker arm oil pressure sensor, then go to step 20.






18. Turn the ignition switch to LOCK (0).

19. Replace the rocker arm oil pressure sensor. Service and Repair

20. Reconnect all connectors.

21. Turn the ignition switch to ON (II).

22. Reset the PCM with the HDS.

23. Do the PCM idle learn procedure. ECM/PCM Idle Learn Procedure

24. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0523 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM, then go to step 1.

NO - Go to step 25.


25. Monitor the OBD STATUS for DTC P0523 in the DTCs MENU with the HDS.

Does the screen indicated PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.


26. Reconnect all connectors.

27. Update the PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

28. Start the engine, and let it idle.

29. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0523 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 28. If the PCM was substituted, go to step 1.

NO - Go to step 30.


30. Monitor the OBD STATUS for DTC P0523 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Temporary DTCs or DTCs were indicated in step 29, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure sensor and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 28. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.