P2649
DTC P2648: 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 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, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM.
5. Turn the ignition switch OFF.
6. Disconnect the rocker arm oil control solenoid 2P connector.
7. Measure resistance between rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.
Is there 14-30 Ohm at room temperature?
YES - Go to step 8.
NO - Go to step 12.
8. Check for continuity between rocker arm oil control solenoid 2P connector terminal No. 1 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 13.
9. Jump the SCS line with the HDS.
10. Disconnect ECM connector B (44P).
11. Check for continuity between ECM connector terminal B34 and rocker arm oil control solenoid 2P connector terminal No. 2.
Is there continuity?
YES - Go to step 19.
NO - Repair open in the wire between the ECM (B34) and the rocker arm oil control solenoid, then go to step 13.
12. Replace the rocker arm oil control valve.
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the ECM with the HDS.
16. Do the ECM idle learn procedure.
17. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P2649 is indicated, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
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.
NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT COMPLETED, go to step 16 and recheck.
19. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
20. Start the engine.
21. 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. If the ECM was updated, substitute a known-good ECM, then go to step 20. If the ECM was substituted, go to step 1.
NO - If no Temporary DTCs or DTCs are indicated, go to step 22. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
22. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM. If the ECM was updated, substitute a known-good ECM, then go to step 20. If the ECM was substituted, go to step 1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 20 and recheck.