DTC U1101 (2014 2015 PGM-FI System)

DTC U1101  : F-CAN Malfunction (PCM-ACM)

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
   U1101 F-CAN Malfunction (PCM-ACM)

   Is DTC U1101 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 engine mount control unit 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. ACM system check

   -1. Check for ACM system DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P15AB Engine Mount Control Unit Power Source Circuit Low Voltage

   Is DTC P15AB indicated?

   YES 

   Do the troubleshooting for ACM system DTC P15AB .

   NO 

   Go to step 3.

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 Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), 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)

   Engine mount control unit 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Engine mount control unit 16P connector: disconnected
   Test circuit	F-CAN_H
   Test point 1	Engine mount control unit 16P connector No. 13 (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 engine mount control unit.

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
   	Engine mount control unit 16P connector: disconnected
   Test circuit	F-CAN_L
   Test point 1	Engine mount control unit 16P connector No. 15 (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 engine mount control unit , then recheck. If DTC U1101 is not indicated after substitution, replace the original engine mount control unit .

   NO 

   Repair an open in the F-CAN_L wire between the PCM (A10) and the engine mount control unit.