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DTC U0100 (2019 2020)

DTC U0100  : F-CAN Malfunction (PCM-TCM)

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshots, and review the General Troubleshooting Information .
  • According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the TCM.
DTC Description Confirmed DTC Pending DTC Freeze Frame
U0100 F-CAN Malfunction (PCM-TCM)      

DTC (A/T)

  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
    U0100 F-CAN Malfunction (PCM-TCM)      

    Is DTC U0100 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 multipurpose camera unit, the CAN gateway, 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. 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 DTC's troubleshooting in the CAN gateway system - Refer to: Fuel and Emissions Systems DTC Troubleshooting Index (KA/KC models) (2014 2015), or A/T System DTC Troubleshooting Index (KA/KC models) (2014 2015), or Brake Booster Pressure Monitoring System DTC Troubleshooting Index (2016 2017 2018 2019 2020), or Fuel and Emissions Systems DTC Troubleshooting Index (KA/KC models) (2016), or Fuel and Emissions Systems DTC Troubleshooting Index (2017 2018), or Fuel and Emissions Systems DTC Troubleshooting Index (2019 2020) .

    NO 

    Go to step 3.

  3. 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 4.

    PCM (Bus B) is Not Available

    Go to step 6.

    TCM (Bus A) is Not Available

    Go to step 8.

    TCM (Bus B) is Not Available

    Go to step 10.

    PCM and TCM are Detected

    Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the TCM, the CAN gateway, and the PCM.

  4. Open wire check (F-CAN A_H line)

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

    - 2. Jump 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 (female terminals) No. 3:
    Test point 2 PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016), or PCM Connector for Inputs and Outputs (2017 2018 2019 2020)
    GHH316151Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_H wire is OK. Go to step 5.

    NO 

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

  5. Open wire check (F-CAN A_L line)

    -1. 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 (female terminals) No. 11:
    Test point 2 PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016)
    GHH316153Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. If they are OK, replace the original PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016 2017 2018 2019 2020) .

    NO 

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

  6. Open wire check (F-CAN B_H line)

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

    - 2. Jump 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 (female terminals) No. 6:
    Test point 2 PCM connector A (51P) No. 11 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016)
    GHH316155Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_H wire is OK. Go to step 7.

    NO 

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

  7. Open wire check (F-CAN B_L line)

    -1. 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 (female terminals) No. 14:
    Test point 2 PCM connector A (51P) No. 12 - Refer to: PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016), or PCM Connector for Inputs and Outputs (2017 2018 2019 2020)
    GHH316157Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. If they are OK, replace the original PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016 2017 2018 2019 2020) .

    NO 

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

  8. Open wire check (F-CAN A_H line)

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

    - 2. Disconnect the following connectors.

    CAN gateway 16P connector
    TCM 58P connector

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 3:
    Test point 2 TCM 58P connector No. 34
    GHH316159Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_H wire is OK. Go to step 9.

    NO 

    Repair an open in the F-CAN A_H wire between the CAN gateway and the TCM.

  9. Open wire check (F-CAN A_L line)

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 11:
    Test point 2 TCM 58P connector No. 47
    GHH316161Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the TCM. If they are OK, replace the original TCM .

    NO 

    Repair an open in the F-CAN A_L wire between the CAN gateway and the TCM.

  10. Open wire check (F-CAN B_H line)

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

    - 2. Disconnect the following connectors.

    CAN gateway 16P connector
    TCM 58P connector

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 6:
    Test point 2 TCM 58P connector No. 7
    GHH316163Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_H wire is OK. Go to step 11.

    NO 

    Repair an open in the F-CAN B_H wire between the CAN gateway and the TCM.

  11. Open wire check (F-CAN B_L line)

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 14:
    Test point 2 TCM 58P connector No. 20
    GHH316165Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the TCM. If they are OK, replace the original TCM .

    NO 

    Repair an open in the F-CAN B_L wire between the CAN gateway and the TCM.

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