J35A7
DTC P2648: Rocker Arm Oil Control Solenoid A (Bank 1) Circuit Low VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Select the VTEC TEST in the INSPECTION MENU, and do the Solenoid Valve ACTIVATION of ROCKER ARM SOL A (B1) with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 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. Turn the ignition switch to ON (II).
8. Select the VTEC TEST in the INSPECTION MENU, and do the SOL. V. ACTIVATION of ROCKER ARM OIL CONTROL SOL A (B1) with the HDS.
Does the RETURN SIGNAL indicate OFF when the COMMAND is turned ON?
YES - Go to step 9.
NO - Replace the rear rocker arm oil control valve, then go to step 13.
9. Turn the ignition switch to LOCK (0).
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (49P).
12. Check for continuity between PCM connector terminal B49 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (B49) and rocker arm oil control solenoid A (Bank 1), then go to step 14.
NO - Check for poor connections or loose terminals at the PCM and rocker arm oil control solenoid A (Bank 1), then go to step 21.
13. Turn the ignition switch to LOCK (0).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure.
18. Select the VTEC TEST in the INSPECTION MENU, and do the Solenoid Valve ACTIVATION of ROCKER ARM SOL A (B1) with the HDS.
19. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 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 20.
20. Monitor the OBD STATUS for DTC P2648 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 19, go to the indicated DTCs troubleshooting.
NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT COMPLETED, go to step 18.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
23. Select the VTEC TEST in the INSPECTION MENU, and do the Solenoid Valve ACTIVATION of ROCKER ARM SOL A (B1) with the HDS.
24. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2648 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, then go to step 23. If the PCM was substituted, go to step 1.
NO - Go to step 25.
25. Monitor the OBD STATUS for DTC P2648 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. If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTCs 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, then go to step 23. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 23.