DTC U0146: F-CAN Malfunction (Battery Condition Monitor Module - Gateway Module) (307) (Battery Condition Monitor Module) (2017)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Electric Powertrain (2017) .

DTCs (HEV)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

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

   - 4. Turn the vehicle to the ON mode.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   U0146 F-CAN Malfunction (Battery Condition Monitor Module - Gateway Module)

   Is DTC U0146 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure. The system is OK at this time. 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. CAN gateway system DTCs check

   - 1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Buss Off
   U0047-00 CAN Gateway F-CAN ch B Buss Off
   U0056-00 CAN Gateway F-CAN ch C Buss Off
   U3000-49 CAN Gateway Internal Failure

   Is any DTCs indicated?

   YES 

   Go to the indicated DTC's troubleshooting - Refer to: Communication Systems DTC Troubleshooting Index (2017) .

   NO 

   Go to step 3.

3. Open wire check (F-CAN A lines)

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

   - 2. Remove the service plug and the IPU front cover.

   - 3. Remove the IPU upper cover.

   - 4. Disconnect the following connectors.

   CAN gateway 24P connector

   Battery condition monitor module connector E (32P)

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

   Test condition	Vehicle OFF (LOCK) mode Battery condition monitor module connector E (32P): disconnected
   	CAN gateway 24P connector: disconnected
   Test point 1	CAN gateway 24P connector No. 14
   Test point 2	Battery condition monitor module connector E (32P) No. 9 - Refer to: Battery Condition Monitor Module Connector for Inputs and Outputs (2017)

   Test point 1	CAN gateway 24P connector No. 15
   Test point 2	Battery condition monitor module connector E (32P) No. 8 - Refer to: Battery Condition Monitor Module Connector for Inputs and Outputs (2017)

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

   Is there continuity?

   YES 

   Replace the battery condition monitor module - Refer to: Battery Condition Monitor Module Removal and Installation (2017) .

   NO 

   Repair an open or poor connection in the F-CAN A wires between the CAN gateway and the battery condition monitor module.