| DTC P2648: | Rocker Arm Oil Control Solenoid Circuit Low Voltage (Except KQ model) |
| 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 the result OK? YES - 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.n NO - Go to 5. |
| 5. | Turn the ignition switch OFF. |
| 6. | Disconnect the rocker arm oil control solenoid 2P connector. |
| 7. | Measure resistance between the rocker arm oil control solenoid 2P connector terminals No. 1 and No. 2.
Is there 14-30 W at room temperature? YES - Go to 8. NO - Go to 11. |
| 8. | Jump the SCS line with the HDS. |
| 9. | Disconnect ECM/PCM connector B (44P). |
| 10. | Check for continuity between ECM/PCM connector terminal B34 and body ground.
Is there continuity? YES - Repair short in the wire between the ECM/PCM (B34) and the rocker arm oil control solenoid, then go to 12. NO - Go to 19. |
| 11. | Replace the rocker arm oil control valve. |
| 12. | Reconnect all connectors. |
| 13. | Turn the ignition switch ON (II). |
| 14. | Reset the ECM/PCM with the HDS. |
| 15. | Do the ECM/PCM idle learn procedure. |
| 16. | Do the VTEC TEST in the INSPECTION MENU with the HDS. |
| 17. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2648 is indicated, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to 18. |
| 18. | Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete.n NO - If the screen indicates FAILED, go to 1 and recheck. If the screen indicates NOT COMPLETED, go to 16 and recheck. |
| 19. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 20. | Do the VTEC TEST in the INSPECTION MENU with the HDS. |
| 21. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2648 is indicated, check for poor connections or loose terminals at the rocker arm oil control solenoid and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |