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DTC U0029-00 (CAN Gateway)

DTC U0029-00  : CAN Gateway F-CAN ch A Bus Off

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC Description DTC
U0029-00 CAN Gateway F-CAN ch A Bus Off  

DTC (CAN GATEWAY)

  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, and wait for 6 seconds.

    -5. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    The failure is duplicated. Go to step 2.

    NO 

    Intermittent failure, the system is OK at this time. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

  2. Shorted unit check (PCM)

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

    -2. Jump the SCS line with the HDS, and wait more than 1 minute.

    -3. Disconnect the following connector.

    PCM connector A (50P)

    -4. Turn the vehicle to the ON mode.

    -5. Clear the DTC with the HDS.

    -6. Turn the vehicle to the OFF (LOCK) mode.

    -7. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 3.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC U0029-00 goes away and the PCM was substituted, replace the original PCM .

  3. Shorted unit check (electric A/C compressor)

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

    -2. Disconnect the following connector.

    Electric A/C compressor connector A (4P)

    -3. Turn the vehicle to the ON mode.

    -4. Clear the DTC with the HDS.

    -5. Turn the vehicle to the OFF (LOCK) mode.

    -6. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 4.

    NO 

    Substitute a known-good electric A/C compressor , then recheck. If DTC U0029-00 goes away and the electric A/C compressor was substituted, replace the original electric A/C compressor .

  4. Shorted unit check (PCU)

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

    -2. Disconnect the following connector.

    PCU 33P connector

    NOTE:  Before disconnecting the PCU connector, do the 12 volt battery terminal disconnection procedure , and turn off the service plug .

    -3. Do the 12 volt battery terminal reconnection procedure .

    -4. Turn the vehicle to the ON mode.

    -5. Clear the DTC with the HDS.

    -6. Turn the vehicle to the OFF (LOCK) mode.

    -7. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 5.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCU , then recheck. If DTC U0029-00 goes away and the PCU was substituted, replace the original PCU .

  5. Shorted unit check (battery condition monitor module)

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

    -2. Disconnect the following connector.

    Battery condition monitor module connector E (32P)

    NOTE:  Before disconnecting the IPU connector, do the 12 volt battery terminal disconnection procedure , and turn off the service plug .

    -3. Do the 12 volt battery terminal reconnection procedure .

    -4. Turn the vehicle to the ON mode.

    -5. Clear the DTC with the HDS.

    -6. Turn the vehicle to the OFF (LOCK) mode.

    -7. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 6.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good battery condition monitor module .

  6. Shorted unit check (VSA modulator-control unit)

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

    -2. Disconnect the following connector.

    VSA modulator-control unit 46P connector

    -3. Turn the vehicle to the ON mode.

    -4. Clear the DTC with the HDS.

    -5. Turn the vehicle to the OFF (LOCK) mode.

    -6. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 7.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good VSA modulator-control unit , then recheck. If DTC U0029-00 goes away and the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit .

  7. Shorted unit check (park pawl actuator driver unit)

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

    -2. Disconnect the following connector.

    Park pawl actuator driver unit 26P connector

    -3. Turn the vehicle to the ON mode.

    -4. Clear the DTC with the HDS.

    -5. Turn the vehicle to the OFF (LOCK) mode.

    -6. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 8.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good park pawl actuator driver unit .

  8. Shorted unit check (electric servo brake control unit)

    -1. Turn the vehicle to the OFF (LOCK) mode with the driver's door open.

    -2. Wait for 3 minutes or more.

    NOTE:  Do not close the driver's door.

    -3. Disconnect the following connector.

    Electric servo brake control unit 22P connector

    -4. Turn the vehicle to the ON mode.

    -5. Clear the DTC with the HDS.

    -6. Turn the vehicle to the OFF (LOCK) mode.

    -7. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 9.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good electric servo brake control unit .

  9. Shorted unit check (SBW shifter control module)

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

    -2. Disconnect the following connector.

    SBW shifter control module 20P connector

    -3. Turn the vehicle to the ON mode.

    -4. Clear the DTC with the HDS.

    -5. Turn the vehicle to the OFF (LOCK) mode.

    -6. Turn the vehicle to the ON mode, and wait for 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off  

    DTC (CAN GATEWAY)

    Is DTC U0029-00 indicated?

    YES 

    Go to step 10.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good SBW shifter assembly .

  10. Shorted wire check (F-CAN A_H line)

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

    -2. Disconnect the following connector.

    CAN gateway 16P connector

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    Electric A/C compressor connector A (4P): disconnected
    PCU 33P connector: disconnected
    Battery condition monitor module connector E (32P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    Park pawl actuator driver unit 26P connector: disconnected
    Electric servo brake control unit 22P connector: disconnected
    SBW shifter control module 20P connector: disconnected
    CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 3:
    Test point 2 Body ground
    GHH383598Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_H wire between the CAN gateway and the connected units.

    NO 

    Go to step 11.

  11. Shorted wire check (F-CAN A_L line)

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    Electric A/C compressor connector A (4P): disconnected
    PCU 33P connector: disconnected
    Battery condition monitor module connector E (32P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    Park pawl actuator driver unit 26P connector: disconnected
    Electric servo brake control unit 22P connector: disconnected
    SBW shifter control module 20P connector: disconnected
    CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 11:
    Test point 2 Body ground
    GHH383600Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_L wire between the CAN gateway and the connected units.

    NO 

    Go to step 12.

  12. Shorted wire check (F-CAN A_H line to F-CAN A_L line)

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    Electric A/C compressor connector A (4P): disconnected
    PCU 33P connector: disconnected
    Battery condition monitor module connector E (32P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    Park pawl actuator driver unit 26P connector: disconnected
    Electric servo brake control unit 22P connector: disconnected
    SBW shifter control module 20P connector: disconnected
    CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 3:
    Test point 2 CAN gateway 16P connector (female terminals) No. 11:
    GHH383603Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_H wire to the F-CAN A_L wire between CAN gateway terminals No. 3 and No. 11.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good CAN gateway , then recheck. If DTC U0029-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .

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