P2649
DTC 2649: Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) 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. Do the VTEC TEST in the INSPECTION MENU with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2649 indicated?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid (VTEC solenoid valve) and the PCM.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the rocker arm oil control solenoid (VTEC solenoid valve) 2P connector.
7. Measure resistance between rocker arm oil control solenoid (VTEC solenoid valve) 2P connector terminals No. 1 and No. 2.
Is there 14-30 Ohm?
YES - Go to step 8.
NO - Go to step 25.
8. Jump the SCS line with the HDS.
9. Disconnect the engine mount control unit 20P connector.
10. Disconnect the active noise control (A/C) unit 16P connector.
11. Disconnect PCM connector E (31P).
12. Check for continuity between PCM connector terminal E21 and body ground.
Is there continuity?
YES - Repair short in the wire between the rocker arm oil control solenoid (VTEC solenoid valve), the engine mount control unit, the active noise control (ANC) unit and the PCM (E21), then go to step 26.
NO - Go to step 13.
13. Reconnect the rocker arm oil control solenoid (VTEC solenoid valve) 2P connector.
14. Reconnect the active noise control (ANC) unit 16P connector.
15. Reconnect PCM connector E (31P).
16. Turn the ignition switch ON (II).
17. Do the VTEC TEST in the INSPECTION MENU with the HDS.
18. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2649 indicated?
YES - Go to step 19.
NO - Replace the engine mount control unit, then go to step 26.
19. Turn the ignition switch OFF.
20. Reconnect the engine mount control unit 20P connector.
21. Disconnect the active noise control (ANC) unit 16P connector.
22. Turn the ignition switch ON (II).
23. Do the VTEC TEST in the INSPECTION MENU with the HDS.
24. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2649 indicated?
YES - Go to step 33.
NO - Replace the active noise control (ANC) unit, then go to step 26.
25. Replace the rocker arm oil control solenoid (VTEC solenoid valve).
26. Reconnect all connectors.
27. Turn the ignition switch ON (II).
28. Reset the PCM with the HDS.
29. Do the PCM idle learn procedure. Programming and Relearning
30. Do the VTEC TEST in the INSPECTION MENU with the HDS.
31. 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 (VTEC solenoid valve) and the PCM, 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 32.
32. 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, check for poor connections or loose terminals at the rocker arm oil control solenoid (VTEC solenoid valve) and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 30 and recheck.
33. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
34. Do the VTEC TEST in the INSPECTION MENU with the HDS.
35. 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 (VTEC solenoid valve) and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.