DTC U0146: F-CAN Malfunction (Battery Condition Monitor Module - Gateway Module) (307) (Battery Condition Monitor Module) (2014-15)

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.

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.

   NO 

   Go to step 3.

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

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

   - 2. Do the 12 volt battery terminal disconnection procedure.

   - 3. Disconnect the following connectors.

   CAN gateway 24P connector - Refer to: CAN Gateway Removal and Installation (2014-15)

   Battery condition monitor module connector C (40P) - Refer to: Battery Condition Monitor Module Removal and Installation (2014-15)

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

   Test condition	Vehicle OFF (LOCK) mode Battery condition monitor module connector C (40P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_H
   Test point 1	CAN gateway 24P connector No. 14 (WHT)
   Test point 2	Battery condition monitor module connector C (40P) No. 30 (WHT)

   Test circuit	F-CAN A_L
   Test point 1	CAN gateway 24P connector No. 15 (RED)
   Test point 2	Battery condition monitor module connector C (40P) No. 10 (RED)

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

   Is there continuity?

   YES 

   The F-CAN A wires are OK. Update the battery condition monitor module if it does not have the latest software, then recheck. If the DTC U0146 goes away and the battery condition monitor module was updated, troubleshooting is complete. If the DTC U0146 goes away and the battery condition monitor module was substituted, replace the original battery condition monitor module - Refer to: Battery Condition Monitor Module Removal and Installation (2014-15) .

   NO 

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