DTC Troubleshooting
DTC Troubleshooting: P2647 (22)
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 engine oil level OK?
YES -
Go to step 2.
NO -
Adjust the engine oil level, then go to step 18.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Check the rocker arm oil pressure switch in the DATA LIST with the HDS.
Does the HDS indicate OFF?
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 and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the rocker arm oil pressure switch 2P connector.
7. Connect rocker arm oil pressure switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch to ON (II).
9. Check the rocker arm oil pressure switch in the DATA LIST with the HDS.
Does the HDS indicate ON?
YES -
Replace the rocker arm oil pressure switch Service and Repair, then go to step 17.
NO -
Go to step 10.
10. Turn the ignition switch to LOCK (0).
11. Remove the jumper wire from the rocker arm oil pressure switch.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector B (49P).
14. Connect rocker arm oil pressure switch 2P connector terminal No. 1 to body ground with a jumper wire.
15. Check for continuity between PCM connector terminal B20 and body ground.
Is there continuity?
YES -
Go to step 16.
NO -
Repair an open in the wire between the PCM (B20) and the rocker arm oil pressure switch, then go to step 17.
16. Check for continuity between the rocker arm oil pressure switch 2P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Go to step 23.
NO -
Repair an open in the wire between the rocker arm oil pressure switch and G101, then go to step 17.
17. Reconnect all connectors.
18. Turn the ignition switch to ON (II).
19. Reset the PCM with the HDS.
20. Do the PCM idle learn procedure.
21. 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 and the PCM, then go to step 1.
NO -
Go to step 22.
22. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 21, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure switch and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
25. Start the engine, and let it idle.
26. 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 PCM. If the PCM was updated, substitute a known-good PCM, then go to step 25. If the PCM was substituted, go to step 1.
NO -
Go to step 27.
27. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS.
Does the HDS 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 Pending or Confirmed DTCs were indicated in step 26, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 25. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.