DTC U0155 (2014 2015 PGM-FI System)

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

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   U0155 F-CAN Malfunction (PCM-Gauge Control Module)

   Is DTC U0155 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Gauge control module DTC check

   -1. Check for gauge control module DTCs with the HDS.

   DTC Description	DTC
   U0029 F-CAN Malfunction (BUS-OFF (PCM))
   U0100 Gauge Control Module Lost Communication With PCM

   Is DTC U0029 and/or U0100 indicated?

   YES 

   Go to step 3.

   NO 

   Do the gauge control module input test - Refer to: Gauge Control Module Input Test (2016), or Gauge Control Module Input Test (2014 2015), or Gauge Control Module Input Test (2017 2018 2019 2020) .

3. Open wire check (F-CAN_H line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS.

   - 3. Disconnect the following connectors.

   PCM connector A (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

   Gauge control module connector A (32P)

   - 4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Gauge control module connector A (32P): disconnected
   Test circuit	F-CAN_H
   Test point 1	Gauge control module connector A (32P) No. 27 (WHT)
   Test point 2	PCM connector A (51P) No. 9 (WHT)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN_H wire between the PCM (A9) and the gauge control module.

4. Open wire check (F-CAN_L line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Gauge control module connector A (32P): disconnected
   Test circuit	F-CAN_L
   Test point 1	Gauge control module connector A (32P) No. 28 (BLK)
   Test point 2	PCM connector A (51P) No. 10 (BLK)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN_L wire is OK. Substitute a known-good gauge control module , then recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module .

   NO 

   Repair an open in the F-CAN_L wire between the PCM (A10) and the gauge control module.