DTC Troubleshooting
DTC P2649: Rocker Arm Oil Control Solenoid Circuit High VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) 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, system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM.
5. Turn the ignition switch OFF.
6. Disconnect the rocker arm oil control solenoid 2P connector.
7. At the solenoid side, measure resistance between rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.
Is there 14 - 17 ohms at room temperature?
YES - Go to step 8.
NO - Go to step 13.
8. Check for continuity between rocker arm oil control solenoid 2P connector terminal No. 2 and body ground.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the rocker arm oil control solenoid and G101, then go to step 14.
9. Jump the SCS line with the HDS.
10. Disconnect ECM/PCM connector B (24P).
11. Connect rocker arm oil control solenoid 2P connector terminal No. 1 to body ground with a jumper wire.
12. Check for continuity between ECM/PCM connector terminal B6 and body ground.
Is there continuity?
YES - Go to step 20.
NO - Repair open in the wire between the ECM/PCM (B6) and the rocker arm oil control solenoid, then go to step 14.
13. Replace the rocker arm oil control valve.
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure.
18. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2649 indicated?
YES - Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM, then go to step 1.
NO - If Temporary DTC or DTC P2649 is not indicated, or if any other Temporary DTCs or DTCs are indicated, go to step 19.
19. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If there was no Temporary DTCs or DTCs indicated on step 18, troubleshooting is complete. If any other Temporary DTCs or DTCs was indicated on step 18, 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, go to step 17 and recheck.
20. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
21. Start the engine.
22. Check for Temporary DTCs or DTCs with the HDS.
Is OTC P2649 indicated?
YES - Check for poor connections or loose terminals at 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 21. If the ECM/PCM was substituted, go to step 1.
NO - If Temporary DTC or DTC P2649 is not indicated, or if any other Temporary DTCs or DTCs are indicated, 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 ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs was indicated on step 22, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at 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 21. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 21 and recheck.