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.
- Information marked with an asterisk (*1) applies to '09-10 models and '11-12 models (M/T).
- Information marked with an asterisk (*2) applies to '11-12 models (A/T).
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 19.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Do the VTEC TEST in the INSPECTION MENU with the HDS.
NOTE: If a DTC was stored during the VTEC TEST, check the DTCs MENU. If DTC P2647 is indicated, go to step 6. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Is the result OK?
YES -
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.
NO -
Go to step 5.
5. Check the result of step 4.
- VTEC Switch Failure
- VTEC Switch Open
- VTEC Switch SIG Line Open
- VTEC Switch GND Line Open
Is the test result any of those above?
YES -
Go to step 6.
NO -
Check for poor connections or loose terminals at the rocker arm oil pressure switch. If it is OK, replace the rocker arm oil control valve Service and Repair, then, go to step 17.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the rocker arm oil pressure switch 2P connector.
8. Connect rocker arm oil pressure switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
9. Turn the ignition switch to ON (II).
10. 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 11.
11. Turn the ignition switch to LOCK (0).
12. Remove the jumper wire from the rocker arm oil pressure switch 2P connector.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector C (49P).
15. Check for continuity between ECM/PCM connector terminal C22 and rocker arm oil pressure switch 2P connector terminal No. 1.
Is there continuity?
YES -
Go to step 16.
NO -
Repair an open in the wire between the ECM/PCM(C22) and the rocker arm oil pressure switch, then go to step 18.
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 Engine Wire Harness (A/T Side), Transmission Range Switch and Shift Solenoid Wire Harnesses, then go to step 18.
17. Turn the ignition switch to LOCK (0).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II).
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.
22. 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.
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 25. 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.