LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2014 >> MDX SH-AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - DTC Diagnostics (2 Of 2) (Except Hybrid) >> DTC Troubleshooting >> DTC U0104 (A/T System (With CAN Gateway)) (2016 2017 2018)

DTC U0104 (A/T System (With CAN Gateway)) (2016 2017 2018)

DTC U0104  : Lost Communication With Adaptive Cruise Control System (ACC) Control Module

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
U0104 Lost Communication With Adaptive Cruise Control System (ACC) Control Module      

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
    U0104 Lost Communication With Adaptive Cruise Control System (ACC) Control Module      

    Is DTC U0104 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 .

    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?

    TCM (Bus A) is Not Available

    Go to step 4.

    TCM (Bus B) is Not Available

    Go to step 6.

    ACC UNIT/MULTIPURPOSE CAMERA UNIT (Bus A) is Not Available

    Go to step 8.

    TCM and ACC UNIT/MULTIPURPOSE CAMERA UNIT are Detected

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

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

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

    - 2. Disconnect the following connectors.

    CAN gateway 24P connector
    TCM 58P connector

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 14
    Test point 2 TCM 58P connector No. 34
    GHH316190Courtesy 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 TCM.

  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 24P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 15
    Test point 2 TCM 58P connector No. 47
    GHH316191Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_L wire is OK. Update the TCM if it does not have the latest software , or substitute a known-good TCM , then recheck. If this DTC goes away and the TCM was updated, troubleshooting is complete. If this DTC goes away and the TCM was substituted, replace the original TCM .

    NO 

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

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

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

    - 2. Disconnect the following connectors.

    CAN gateway 24P connector
    TCM 58P connector

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 11
    Test point 2 TCM 58P connector No. 7
    GHH316192Courtesy 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 TCM.

  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 24P connector: disconnected
      TCM 58P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 10
    Test point 2 TCM 58P connector No. 20
    GHH316193Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN B_L wire is OK. Update the TCM if it does not have the latest software , or substitute a known-good TCM , then recheck. If this DTC goes away and the TCM was updated, troubleshooting is complete. If this DTC goes away and the TCM was substituted, replace the original TCM .

    NO 

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

  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 24P connector
    Multipurpose camera unit 20P connector

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

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 24P connector: disconnected
      Multipurpose camera unit 20P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 14
    Test point 2 Multipurpose camera unit 20P connector No. 2 - Refer to:
    Multipurpose Camera Unit Connector for Inputs and Outputs (2017 2018 2019 2020), or
    Multipurpose Camera Unit Connector for Inputs and Outputs (2016)
    GHH316194Courtesy 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 multipurpose camera unit.

  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 24P connector: disconnected
      Multipurpose camera unit 20P connector: disconnected
    Test point 1 CAN gateway 24P connector No. 15
    Test point 2 Multipurpose camera unit 20P connector No. 13 - Refer to:
    Multipurpose Camera Unit Connector for Inputs and Outputs (2017 2018 2019 2020), or
    Multipurpose Camera Unit Connector for Inputs and Outputs (2016)
    GHH316195Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F-CAN A_L wire is OK. Update the multipurpose camera unit if it does not have the latest software , or substitute a known-good multipurpose camera unit , then recheck. If this DTC goes away and the multipurpose camera unit was updated, troubleshooting is complete. If this DTC goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

    NO 

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

scientia non olet · About LEMON Manuals