P2648
DTC P2648: VTEC Solenoid Valve Circuit Low Voltage1. 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 valve and the ECM/PCM.
NO - Go to step 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 Ohms?
YES - Go to step 7.
NO - Go to step 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 step 11.
NO - Go to step 18.
10. Replace the VTEC solenoid valve
11. Reconnect all connections.
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 over 4,000 rpm. 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 valve and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Go to step 17.
17. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the Honda PGM Tester or the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - If the screen indicates FAILED, then go to step 1 and recheck. If the screen indicates NOT COMPLETED, go to step 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 in [I] position) to over 4,000 rpm. 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 valve and the ECM/PCM, then go to step 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.