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

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0122 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the SH-AWD control unit and the PCM.
Check for body electrical DTCs in the DTCs MENU with the HDS.
Is DTC B1168, B1169 and/or B1178 indicated?

YES -Go to step 5.

NO -Do the gauge control module input test (see GAUGE CONTROL MODULE INPUT TEST ).
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Remove the gauge control module (GAUGE CONTROL MODULE REPLACEMENT ), and disconnect the gauge control module connector B (28P).
Disconnect PCM connector E (31P).
Check for continuity between PCM connector terminal E15 and gauge control module connector B (28P) terminal No. 16.

Fig 1: Checking Continuity Between PCM Connector Terminal E15 And Gauge Control Module Connector B (28P) Terminal No. 16
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 10.

NO -Repair open in the wire between the PCM (E15) and the gauge control unit, then go to step 11.
Check for continuity between PCM connector terminal E26 and gauge control module connector B (28P) terminal No. 15.

Fig 2: Checking Continuity Between PCM Connector Terminal E15 and Gauge Control Module Connector B (28P) Terminal No. 15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good gauge control unit (see GAUGE CONTROL MODULE REPLACEMENT ), then go to step 11 and recheck. If DTC U0155 is not indicated, replace the original gauge control unit (see GAUGE CONTROL MODULE REPLACEMENT ), then go to step 11.

NO -Repair open in the wire between the PCM (E26) and the gauge control unit, then go to step 11.
Reconnect all connectors.
Turn the ignition switch to 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 with the HDS.
Is DTC U0155 indicated?

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

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