DTC Troubleshooting: P2649 (21)

DTC P2649:  VTEC Solenoid Valve Circuit High Voltage

1.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 (min-1) without load (in Park or neutral) until the radiator fan comes on, then let it idle.

4.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2649 indicated?


YES - Go to 5.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VTEC solenoid valve and the ECM/PCM.n


5.Turn the ignition switch OFF.

6.Disconnect the VTEC solenoid valve 2P connector.

7.Measure resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2.

 

Is there 14-30 W at room temperature?


YES - Go to 8.


NO - Go to 13.

8.Check for continuity between VTEC solenoid valve terminal No. 1 and body ground.

 

Is there continuity?


YES - Go to 9.


NO - Repair open in the wire between the VTEC solenoid valve and G101, then go to 14.


9.Jump the SCS line with the HDS.

10.Disconnect ECM/PCM connector B (24P).

11.Connect VTEC solenoid valve 2P connector terminal No. 2 to body ground with a jumper wire.

 

12.Check for continuity between ECM/PCM connector terminal B6 and body ground.

 

Is there continuity?


YES - Go to 20.


NO - Repair open in the wire between the ECM/PCM (B6) and the VTEC solenoid valve, then go to 14.


13.Replace the VTEC solenoid valve.

14.Reconnect all connectors.

15.Turn the ignition switch ON (II).

16.Reset the ECM/PCM with the HDS.

17.Do the ECM/PCM idle learn procedure.

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 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 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.n


NO - If the screen indicates FAILED, go to 1 and recheck. If the screen indicates NOT COMPLETED, go to 17 and recheck.


20.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

21.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 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