DTC Troubleshooting

DTC Troubleshooting: P2647, P2647

DTC P2647:

Rocker Arm Oil Pressure Switch 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. Check the engine oil level.

Is the level OK?

YES -

Go to step 2.

NO -

Adjust the engine oil to the proper level, then go to step 16.

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

3. Clear the DTC with the HDS.

4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2647 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the ECM/PCM.�

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

6. Disconnect the rocker arm oil pressure switch 2P connector.

7. At the rocker arm oil pressure switch side, check for continuity between its 2P connector terminals.





Is there continuity?

YES -

Go to step 8.

NO -

Replace the rocker arm oil pressure switch Service and Repair, then go to step 15.

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

9. Measure the voltage between rocker arm oil pressure switch 2P connector terminal No. 1 and body ground.





Is there battery voltage?

YES -

Repair open in the wire between the rocker arm oil pressure switch and G101; A/T, M/T, then 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 ECM/PCM connector C (49P).

13. Check for continuity between rocker arm oil pressure switch 2P connector terminal No. 1 and ECM/PCM connector terminal C22.





Is there continuity?

YES -

Go to step 20.

NO -

Repair open in the wire between the ECM/PCM(C22) and the rocker arm oil pressure switch, then go to step 15.

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

15. Reconnect all connectors.

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

17. Reset the ECM/PCM with the HDS.

18. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (M/T).

19. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2647 indicated?

YES -

Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the ECM/PCM, then go to step 1.

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

20. Reconnect all connectors.

21. Update the ECM/PCM if it does not have the latest software ECM/PCM Update (M/T), or substitute a known-good ECM/PCM.

22. Start the engine, and let it idle.

23. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2647 indicated?

YES -

Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 22. If the ECM/PCM was substituted, go to step 1.

NO -

If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�