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

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
If DTC U0029 is stored at the same time as DTC U0114, troubleshoot DTC U0029 first, then recheck for DTC U0114.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs 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 VTM-4 control Unit and the PCM.
Check for communication to the VTM-4 system with the HDS.
Does the HDS communicate with the VTM-4 control unit?

YES - Go to step 5.

NO - Go to THE VTM-4 INDICATOR DOES NOT GO OFF, BUT NO DTCS ARE STORED IN ANY SYSTEM: VTM-4, VSA OR PGM-FI .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (49P).
Disconnect the VTM-4 control unit connector A (22P).
Check for continuity between PCM connector terminal A48 (A49)* and VTM-4 control unit connector terminals A11 and A22* individually.

Fig 1: PCM Connector A (49P) & VTM-4 Control Unit Connector A (22P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

*: CANL line

Is there continuity?

YES - Substitute a known-good VTM-4 control unit (see VTM-4 LOCK SWITCH TEST/REPLACEMENT ), then go to step 10 and recheck. If DTC U0114 is not indicated, replace the original VTM-4 control unit (see VTM-4 LOCK SWITCH TEST/REPLACEMENT ), then go to step 10.

NO - Repair open in the wire between the VTM-4 control unit (A11 (A22)*) and the PCM (A48 (A49)*), then go to step 10.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the PCM with the HDS.
Do PCM IDLE LEARN PROCEDURE .
Check for Pending or Confirmed DTCs in the DTCs MENU with the HDS.
Is DTC U0114 indicated?

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

NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.