DTC U0155: F-CAN Malfunction (ECM/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 U0155 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 and the ECM/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 (see GAUGE CONTROL MODULE REPLACEMENT )
Disconnect the gauge control module 32P connector
Disconnect ECM/PCM connector A (49P)
Connect gauge control module 32P connector terminal No 22 to body ground with a jumper wire

Fig 1: Connecting Gauge Control Module 32P Connector Terminal No 22 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminal A3 and body ground

Fig 2: Checking Continuity Between ECM/PCM Connector Terminal A3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 12

NO -Repair open in the wire between the ECM/PCM (A3) and the gauge control module, then go to step 14
Connect gauge control module 32P connector terminal No 21 to body ground with a jumper wire

Fig 3: Connecting Gauge Control Module 32P Connector Terminal No 21 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between ECM/PCM connector terminal A4 and body ground

Fig 4: Checking Continuity Between ECM/PCM Connector Terminal A4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), then go to step Hand recheck If DTC U0155 is not indicated after substitution, replace the original gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), then go to step 14

NO -Repair open in the wire between the ECM/PCM (A4) and the gauge control module, then go to step 14
Reconnect all connectors
Turn the ignition switch to ON (II)
Reset the ECM/PCM with the HDS
Do the ECM/PCM idle learn procedure (see ECM/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 and the ECM/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