P0523
DTC P0523: EOP Sensor Circuit High VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch ON (II).
2. Check the 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, system is OK at this time. Check for poor connections or loose terminals at the EOP sensor and the ECM/PCM.
3. Turn the ignition switch OFF.
4. Disconnect the EOP sensor 3P connector.
5. Connect EOP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check the 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 voltage between EOP 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 OFF.
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector C (44P).
13. Check for continuity between ECM/PCM connector terminal C14and EOP sensor 3P connector terminal No. 3.
Is there continuity?
Yes - Go to step 26.
NO - Repair open in the wire between the ECM/PCM (C14) and the EOP sensor, then go to step 20.
14. Turn the ignition switch OFF.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector C (44P).
17. Check for continuity between ECM/PCM connector terminal C22 and EOP sensor 3P connector terminal No. 2.
Is there continuity?
Yes - Go to step 26.
NO - Repair open in the wire between the ECM/PCM (C22) and the EOP sensor, then go to step 20.
18. Turn the ignition switch OFF.
19. Replace the EOP sensor.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure.
24. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
Yes - If DTC P0523 is indicated, check for poor connections or loose terminals at the EOP sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
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.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EOP sensor and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 23 and recheck.
26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
27. Start the engine.
28. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0523 indicated?
Yes - Check for poor connections or loose terminals at the EOP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 27. If the ECM/PCM was substituted, go to step 1.
NO - If no Temporary DTCs or DTCs are indicated, go to step 29. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
29. Monitor the OBD STATUS for DTC P0523 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
Yes - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EOP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 27. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, let the engine idle until a result comes on.