P2647
DTC P2647: Rocker Arm Oil Pressure Switch Circuit High VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Check the engine oil level.
Is the engine oil level OK?
YES - Go to step 2.
NO - Adjust the engine oil to the proper level, then go to step 17.
2. Turn the ignition switch ON (II).
3. Clear the DTC with the HDS.
4. Do the VTEC TEST in the INSPECTION MENU with the HDS.
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 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 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 solenoid, then go to step 15.
6. Turn the ignition switch OFF.
7. Disconnect the rocker arm oil pressure switch 2P connector.
8. At the rocker arm oil pressure switch side, check for continuity between rocker arm oil pressure switch 2P connector terminals No. 1 and No. 2.
Is there continuity?
YES - Go to step 9.
NO - Replace the rocker arm oil pressure switch, then go to step 16.
9. Turn the ignition switch ON (II).
10. Measure 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, then go to step 15.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Check for continuity between rocker arm oil pressure switch 2P connector terminal No. 1 and PCM connector terminal C22.
Is there continuity?
YES - Go to step 21.
NO - Repair open in the wire between the PCM (C22) and the rocker arm oil pressure switch, then go to step 16.
15. Turn the ignition switch OFF.
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Reset the PCM with the HDS.
19. Do the PCM idle learn procedure.
20. Check for Temporary DTCs or 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, then go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
23. Start the engine.
24. Check for Temporary DTCs or 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 23. If the PCM was substituted, go to step 1.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.