DTC U0100-00: Lost Communication With The PCM (Multipurpose Camera Unit) (L4, 2018-19)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) and How to Troubleshoot the Collision Mitigation Braking System (CMBS) .

1. CAN gateway system DTC check

   -1. Turn the vehicle to the ON mode.

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

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

   Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

   YES 

   Go to the indicated DTCs troubleshooting.

   NO 

   Go to step 2.

2. F-CAN circuit communication check

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   PCM (Bus A) is Not Available

   Go to step 3.

   Multipurpose camera unit (Bus A) is Not Available

   Go to step 4.

   Multipurpose camera unit and PCM are Detected

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to: How to Troubleshoot the Adaptive Cruise Control (ACC) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) . 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.

3. Open wire check (F-CAN_L, F-CAN_H lines)

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

   - 2. Short the SCS line with the HDS.

   - 3. Disconnect the following connectors.

   CAN gateway 16P connector

   PCM connector A (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	PCM connector A (51P): disconnected
   Test point 1	CAN gateway 16P connector No. 11:
   Test point 2	PCM connector A (51P) No. 3 - Refer to: PCM Connector for Inputs and Outputs (L4) (2018-19)

   Test point 1	CAN gateway 16P connector No. 3:
   Test point 2	PCM connector A (51P) No. 2 - Refer to: PCM Connector for Inputs and Outputs (L4) (2018-19)

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

   Is there continuity?

   YES 

   Check for loose terminals in the CAN gateway 16P connector and PCM connector A (51P). If they are OK, update the PCM if it does not have the latest software , or substitute a known-good PCM - Refer to: PCM Removal and Installation (Without SH-AWD) , then recheck. If DTC U0100-00 is not indicated after substitution, replace the PCM - Refer to: PCM Removal and Installation (Without SH-AWD) .

   NO 

   Repair an open in the wire between the CAN gateway and the PCM.

4. Open wire check (F-CAN_L, F-CAN_H lines)

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

   - 2. Disconnect the following connectors.

   CAN gateway 16P connector

   Multipurpose camera unit 20P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	CAN gateway 16P connector No. 11:
   Test point 2	Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19)

   Test point 1	CAN gateway 16P connector No. 3:
   Test point 2	Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19)

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

   Is there continuity?

   YES 

   Check for loose terminals in the multipurpose camera unit 20P connector. If the multipurpose camera unit was updated and the symptom/indication is still present, replace the multipurpose camera unit .

   NO 

   Repair an open in the wire between the CAN gateway and the multipurpose camera unit.