DTC Troubleshooting
DTC Troubleshooting: P2649
DTC P2649:
Rocker Arm Oil Control Solenoid 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), or press the engine start/stop button to select the ON mode.
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 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 the rocker arm oil control solenoid and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the rocker arm oil control solenoid 1P connector.
7. At the solenoid side, measure the resistance between the rocker arm oil control solenoid 1P connector terminal and the solenoid valve body.
Is there 14-30 Ohms at room temperature?
YES -
Go to step 8.
NO -
Go to step 11.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector B (49P).
10. Check for continuity between PCM connector terminal B39 and the rocker arm oil control solenoid 1P connector terminal.
Is there continuity?
YES -
Go to step 18.
NO -
Repair an open in the wire between the PCM (B39) and the rocker arm oil control solenoid, then go to step 12.
11. Replace the rocker arm oil control solenoid Service and Repair.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure PCM Idle Learn Procedure.
16. Check for Pending or Confirmed 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 PCM, then go to step 1.
NO -
Go to step 17.
17. 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 16, 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, keep idling until a result comes on.
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
20. Start the engine, and let it idle.
21. Check for Pending or Confirmed 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 PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
NO -
Go to step 22.
22. 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 21, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.