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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 GENERAL TROUBLESHOOTING INFORMATION .
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Pending or Confirmed 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.

  4. 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 GAUGE CONTROL MODULE INPUT TEST .

  5. Turn the ignition switch to LOCK (0).
  6. Jump the SCS line with the HDS.
  7. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
  8. Disconnect the gauge control module 32P connector.
  9. Disconnect ECM/PCM connector A (49P).
  10. Check for continuity between ECM/PCM connector terminal A3 and gauge control 32P connector terminal No. 30.

    Is there continuity? 

    YES:  Go to step  11.

    NO:  Repair open in the wire between the ECM/PCM (A3) and the gauge control module, then go to step  12.

    Fig 1: Checking Continuity Between ECM/PCM Connector Terminal A3 & Body Ground
    G00492836Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check for continuity between ECM/PCM connector terminal A4 and body ground.

    Is there continuity? 

    YES:  Substitute a known-good gauge control module, then go to step  12 and recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module, then go to step  12.

    NO:  Repair open in the wire between the ECM/PCM (A4) and the gauge control module, then go to step  12.

    Fig 2: Checking Continuity Between ECM/PCM Connector Terminal A4 & Body Ground
    G00492837Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Reconnect all connectors.
  13. Turn the ignition switch to ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do ECM/PCM IDLE LEARN PROCEDURE .
  16. Check for Pending or Confirmed 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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