DTC U0114: F-CAN Malfunction (VTM-4 Control Unit-PCM)

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see DTC TROUBLESHOOTING INDEX ).
If DTC U0073 is stored at the same time as DTC U0114, troubleshoot DTC U0073 first, then recheck for DTC U0114.

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC U0114 indicated?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VTM-4 control unit, and the PCM.
Check for DTCs in the DTCs MENU with the HDS.
Is TCS DTC 41 indicated?

YES - Go to step 5.

NO - Go to step 8.
Turn the ignition switch OFF.
Disconnect the VTM-4 control unit 22P connector.
Check for continuity between VTM-4 control unit 22P connector terminals No. 11 and No. 22*.

Fig 1: Checking Continuity Between VTM-4 Control Unit 22P Connector Terminals 11 And 22
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Substitute a known-good VTM-4 control unit, then go to step 15 and recheck. If no DTCs are indicated, replace the original VTM-4 control unit, then go to step 15.

NO - Repair open in the wire between the VTM-4 control unit (No. 11 (No. 22) *) and the PCM (A36 (A1) *), then go to step 15.

*: CANL line
Check for poor connections at the VTM-4 control unit 22P connector and 12P connector.
Are the connections OK?

YES - Go to step 9.

NO - Repair the connections, then go to step 15.
Turn the ignition switch OFF.
Disconnect the VTM-4 control unit 12P connector.
Turn the ignition switch ON (II).
Measure voltage between VTM-4 control unit 12P connector terminal No. 7 and body ground.

Fig 2: Measuring Voltage Between VTM-4 Control Unit 12P Connector Terminal 7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 13.

NO - Check for a VTM-4 system DTC 44-1 (see DTC TROUBLESHOOTING INDEX ). If DTC 44-1 is indicated, troubleshoot and repair as needed, then go to step 15. If DTC 44-1 is not indicated, go to step 15.
Turn the ignition switch OFF.
Check for continuity between VTM-4 control unit 12P connector terminals No. 5 and No. 12 and body ground, and between VTM-4 control unit 22P connector terminal No. 10 and body ground individually.

Fig 3: Checking Continuity Between VTM-4 Control Unit 12P Connector Terminals 5 And 12 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Checking Continuity Between VTM-4 Control Unit 22P Connector Terminal 10 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Substitute a known-good VTM-4 control unit, then go to step 15 and recheck. If no DTCs are indicated, replace the original VTM-4 control unit, then go to step 15.

NO - Repair open in the wire between the VTM-4 control unit and body ground (G501), then go to step 15.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC U0114 indicated?

YES - Check for poor connections or loose terminals at the gauge control module, the VTM-4 control unit, and the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs indicated, go to the indicated DTCs troubleshooting.