DTC Troubleshooting
DTC Troubleshooting: P2649
DTC P2649:
Rocker Arm Oil Control Solenoid A Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Select the VTEC TEST in the INSPECTION MENU, go to the SOLENOID VALVE ACTIVATION, and do the rocker arm oil control solenoid A activation test with the HDS. If you cannot complete the test, skip this step.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2649 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at rocker arm oil control solenoid A and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the rocker arm oil control solenoid A 2P connector.
7. At the solenoid side, measure the resistance between rocker arm oil control solenoid A 2P connector terminals No. 1 and No. 2.
Is there 14-30 Ohms at room temperature (65-70°F, 18-21°C)?
YES -
Go to step 8.
NO -
Go to step 12.
8. Check for continuity between rocker arm oil control solenoid A 2P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Go to step 9.
NO -
Repair an open in the wire between rocker arm oil control solenoid A and G101, then go to step 13.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector C (49P).
11. Check for continuity between PCM connector terminal C24 and rocker arm oil control solenoid A 2P connector terminal No. 1.
Is there continuity?
YES -
Go to step 20.
NO -
Repair an open in the wire between the PCM (C24) and rocker arm oil control solenoid A, then go to step 13.
12. Replace the rocker arm oil control valve Service and Repair.
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure PCM Idle Learn Procedure.
17. Do the VTEC TEST in the INSPECTION MENU with the HDS.
18. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2649 indicated?
YES -
Check for poor connections or loose terminals at rocker arm oil control solenoid A and the PCM, then go to step 1.
NO -
Go to step 19.
19. Monitor the OBD STATUS for DTC P2649 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 18, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, go to step 1 and recheck. If the HDS indicates NOT COMPLETED, go to step 17.
20. Reconnect all connectors.
21. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
22. Do the VTEC TEST in the INSPECTION MENU with the HDS.
23. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2649 indicated?
YES -
Check for poor connections or loose terminals at rocker arm oil control solenoid A and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1.
NO -
Go to step 24.
24. Monitor the OBD STATUS for DTC P2649 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 23, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at rocker arm oil control solenoid A and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 22.