DTC U0155: F-CAN Malfunction (Gauge Control Module-Motor Control Module (MCM))

NOTE:

If DTC U0155 is indicated on the HDS, the sends and receives communication function of the MCM is OK.
Before you troubleshoot, record all freeze data, and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
If the DTC cannot be cleared, do the troubleshooting for DTC U1204.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS (see DTC CLEAR ).
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and wait 4 seconds.
Turn the ignition switch to LOCK (0), then turn the ignition switch to ON (II) again, and wait 4 seconds.
Check for Pending or Confirmed DTCs in the IMA SYSTEM with the HDS.
Is DTC U0155 indicated?

YES -Go to step 7.

NO -Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the instrument panel indicators.
Do any indicators come on?

YES -Go to step 9.

NO -Go to step 17.
Turn the ignition switch to LOCK (0).
Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT ).
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION ).
Disconnect the gauge control module 32P connector.
Disconnect MCM connector A (31P).
Check for continuity between gauge control module 32P connector terminal No. 19 and MCM connector terminal A23.

Fig 1: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 19 And MCM Connector Terminal A23
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 16.

NO -Repair an open in the wire between the gauge control module 32P connector and the MCM (A23), then go to step 22.
Check for continuity between gauge control module 32P connector terminal No. 20 and MCM connector terminal A22.

Fig 2: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 20 And MCM Connector Terminal A22
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

NO -Repair an open in the wire between the gauge control module 32P connector and the MCM (A22), then go to step 22.
Turn the ignition switch to LOCK (0).
Check the No. B22 METER (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -Go to step 19.

NO -Repair a short in the wire between the No. B22 METER (7.5 A) fuse and gauge control module 32P connector terminal No. 17. Also replace the No. B22 METER (7.5 A) fuse, then go to step 22.
Disconnect the gauge control module 32P connector.
Turn the ignition switch to ON (II).
Measure the voltage between gauge control module 32P connector terminal No. 17 and body ground.

Fig 3: Measuring Voltage Between Gauge Control Module 32P Connector Terminal No. 17 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair an open in the ground wire (G501) (see VISOR SWITCH SUBHARNESS (BE) ), then go to step 22.

NO -Repair an open in the wire between the No. B22 METER (7.5 A) fuse and the gauge control module 32P connector, then go to step 22.
Reconnect all connectors.
Reinstall the PCU cover, the PCU busplate, and the PCU lid (see IPU CASE REMOVAL/INSTALLATION ).
Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION ), then turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT ).
Turn the ignition switch to ON (II).
Clear the DTC with the HDS (see DTC CLEAR ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0155 indicated?

YES -Check for poor connections or loose terminals at the MCM and the gauge control module, 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 .