| DTC P2648: | VTEC Solenoid Valve Circuit Low Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 3. | Do the VTEC TEST in the INSPECTION MENU with the Honda PGM Tester or the HDS. Is the result OK? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTEC solenoid value and the ECM/PCM.n NO - Go to 4. |
| 4. | Turn the ignition switch OFF. |
| 5. | Disconnect the VTEC solenoid valve 2P connector. |
| 6. | Measure resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2. Is there 14-30 W? YES - Go to 7. NO - Go to 10. |
| 7. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 8. | Disconnect ECM/PCM connector B (24P). |
| 9. | Check for continuity between ECM/PCM connector terminal B6 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B6) and the VTEC solenoid valve, then go to 11. NO - Go to 18. |
| 10. | Replace the VTEC solenoid valve. |
| 11. | Reconnect all connectors. |
| 12. | Turn the ignition switch ON (II). |
| 13. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 14. | Do the ECM/PCM idle learn procedure. |
| 15. | Test-drive under the following conditions: Accelerate in 1st gear to an engine speed over 4,000 rpm (min-1). Hold the speed for at least 2 seconds. |
| 16. | Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2648 is indicated, check for poor connections or loose terminals at the VTEC solenoid value and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Go to 17. |
| 17. | Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the Honda PGM Tester or the HDS. Is it PASSED? YES - Troubleshooting is complete.n NO - If it is FAILED, then go to 1. and recheck. If it is NOT COMPLETED, go to 15 and recheck. |
| 18. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 19. | Test-drive under the following conditions: Accelerate in 1st gear (A/T: 1 position) to an engine speed over 4,000 rpm (min-1). Hold the speed for at least 2 seconds. |
| 20. | Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2648 is indicated, check for poor connections or loose terminals at the VTEC solenoid value and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |