With A/T

DTC Troubleshooting: P2649

DTC P2649: Rocker Arm Oil Control Solenoid A (Bank 1) 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. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

4. Check for Temporary DTCs or 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 (Bank 1) and the PCM.


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

6. Disconnect the rocker arm oil control solenoid A (Bank 1) 2P connector.

7. Measure the resistance between rocker arm oil control solenoid A (Bank 1) 2P connector terminals No. 1 and No.2.

Is there 13.6-16.9 Ohms at room temperature?
YES - Go to step 8.

NO - Go to step 12.






8. Check for continuity between rocker arm oil control solenoid A (Bank 1) 2P connector terminal No. 2 and body ground.

Is there continuity?
YES - Go to step 9.

NO - Repair open in the wire between rocker arm oil control solenoid A (Bank 1) terminal No. 2 and G101, then go to step 13.






9. Jump the SCS line with the HDS.

10. Disconnect PCM connector B (49P).

11. Check for continuity between PCM connector terminal B49 and rocker arm oil control solenoid A (Bank 1) 2P connector terminal No. 1.

Is there continuity?
YES - Go to step 19.

NO - Repair open in the wire between the PCM (B49) and the rocker arm oil control solenoid A (Bank 1), then go to step 13.






12. Replace the rear rocker arm oil control valve. Rear Rocker Arm Oil Control Valve Replacement (J35Z2 Engine)

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. ECM/PCM Idle Learn Procedure

17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2649 indicated?
YES - Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1) and the PCM, then go to step 1.

NO - Go to step 18.


18. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 17, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT COMPLETED, keep idling until a result comes on.


19. Reconnect all connectors.

20. Update the PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good PCM. Initial Inspection and Diagnostic Overview

21. Start the engine, and let it idle.

22. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2649 indicated?
YES - Check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1) and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 21. If the PCM was substituted, go to step 1.

NO - Go to step 23.


23. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.

Does the screen 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 Temporary DTCs or DTCs were indicated in step 22, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at rocker arm oil control solenoid A (Bank 1) and the PCM. If the PCM was updated, substitute a known-good PCM, Initial Inspection and Diagnostic Overview then go to step 21. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.