DTC U0155 (106): F-CAN Malfunction (Gauge Control Module-Motor Control Module (MCM))

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If DTC U0155 (106) is indicated on the HDS, sends and receives communication function of 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 (55).

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.
Check for Pending or Confirmed DTCs in the IMA SYSTEM with the HDS.
Is DTC U0155 (106) indicated?

YES -go to step 6.

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 8.

NO -go to step 18.
Turn the ignition switch to LOCK (0).
Turn the battery module switch OFF (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) 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. 20 and MCM connector terminal A30.

Fig 1: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 20 And MCM Connector Terminal A30
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 15.

NO -Repair an open in the wire between the gauge control module 32P connector and the MCM (A30), then go to step 21.
Check for continuity between gauge control module 32P connector terminal No. 19 and MCM connector terminal A31.

Fig 2: Checking Continuity Between Gauge Control Module 32P Connector Terminal No. 19 And MCM Connector Terminal A31
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 (A31), then go to step 21.
Turn the ignition switch to LOCK (0).
Check the No. 22 METER (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -go to step 18.

NO -Repair a short in the wire between the No. 22 METER (7.5 A) fuse and gauge control module 32P connector terminal No. 15. Also replace the No. 22 METER (7.5 A) fuse, then go to step 21.
Disconnect the gauge control module 32P connector.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and gauge control module 32P connector terminal No. 15.

Fig 3: Measuring Voltage Between Body Ground And Gauge Control Module 32P Connector Terminal 15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair an open in the ground wire (G501), then go to step 21.

NO -Repair an open in the wire between the No. 22 METER (7.5 A) fuse and gauge control module 32P connector, then go to step 21.
Reconnect all connectors.
Reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION ), then turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
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 (106) indicated?

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

NO -go to step 27.
Monitor the OBD STATUS for DTC U0155 (106) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?

YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 26, go to the indicated DTC's troubleshooting.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MCM and the gauge control module, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.