P2649
DTC P2649: VTEC Solenoid Valve Circuit High Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check for DTCs in the DTCs MENU with the HDS.
Is DTC P2649 indicated?
YES - Go to step 5.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTEC solenoid valve and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the VTEC solenoid valve 1P connector.
7. Measure resistance between VTEC solenoid valve 1P connector terminal No.1 and the solenoid valve body.
Is there 14 - 30 Ohms?
YES - Go to step 8.
NO - Replace the VTEC solenoid valve, then go to step 14.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (73P).
10. Connect VTEC solenoid valve 1P connector terminal No.1 to body ground with a jumper wire.
11. Check for continuity between PCM connector terminal A17 and body ground.
Is there continuity?
YES - Go to step 20.
NO - Repair open in the wire between the PCM (A17) and the VTEC solenoid valve, then go to step 12.
12. Reconnect PCM connector A (73P).
13. Reconnect the VTEC solenoid valve 1P connector.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure.
17. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
18. 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 VTEC solenoid valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs indicated, go to indicated DTC's troubleshooting.
NO - Go to step 19.
19. 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, then go to step 1 and recheck. If the screen indicates NOT COMPLETED, go to step 18 and recheck.
20. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
21. Do the PCM idle learn procedure.
22. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle,
23. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P2647 is indicated, check for poor connections or loose terminals at the 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.