LEMON Manuals: Even more car manuals for everyone
Home >> Honda >> 2021 >> Civic Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Gateway - DTC Diagnostics >> DTC Troubleshooting >> DTC U0047-00 (L15B7/L15BY: With CAN gateway) (2016 2017 2018)

DTC U0047-00 (L15B7/L15BY: With CAN gateway) (2016 2017 2018)

DTC U0047-00  : CAN Gateway F-CAN ch B Bus Off

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

DTC Description DTC
U0047-00 CAN Gateway F-CAN ch B 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 6 seconds.

    -5. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 2.

    NO 

    Intermittent failure, the system is OK at this time.

  2. Shorted unit check (PCM)

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

    -2. Jump the SCS line with the HDS.

    -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 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 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 U0047-00 goes away and the PCM was substituted, replace the original PCM .

  3. Shorted unit check (EPS control unit)

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

    -2. Disconnect the following connector.

    EPS control unit connector B (6P)

    -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 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 4.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the EPS control unit .

  4. Shorted unit check (multipurpose camera unit)

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

    -2. Jump the SCS line with the HDS.

    -3. Disconnect the following connector.

    Multipurpose camera unit 20P 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 6 seconds.

    -8. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES (without navigation)

    Go to step 5.

    YES (with navigation)

    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 multipurpose camera unit , then recheck. If DTC U0047-00 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

  5. Shorted unit check (audio unit)

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

    -2. Disconnect the following connector.

    Audio unit connector E (16P)

    -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 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 7.

    NO 

    Substitute a known-good audio unit , then recheck. If DTC U0047-00 goes away and the audio unit was substituted, replace the original audio unit .

  6. Shorted unit check (audio-navigation unit)

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

    -2. Disconnect the following connector.

    Audio-navigation unit connector E (16P)

    -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 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 7.

    NO 

    Substitute a known-good audio-navigation unit , then recheck. If DTC U0047-00 goes away and the audio-navigation unit was substituted, replace the original audio-navigation unit .

  7. Shorted unit check (SRS unit)

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

    -2. Do the 12 volt battery terminal disconnection procedure , and wait for at least 3 minutes.

    -3. Disconnect the following connector.

    SRS unit connector A (39P)

    -4. Do the 12 volt battery terminal reconnection procedure .

    -5. Turn the vehicle to the ON mode.

    -6. Clear the DTC with the HDS.

    -7. Turn the vehicle to the OFF (LOCK) mode.

    -8. Turn the vehicle to the ON mode, and wait 6 seconds.

    -9. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 8.

    NO 

    Substitute a known-good SRS unit , then recheck. If DTC U0047-00 goes away and the SRS unit was substituted, replace the original SRS unit .

  8. 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 6 seconds.

    -7. Check for DTCs with the HDS.

    DTC Description DTC
    U0047-00 CAN Gateway F-CAN ch B Bus Off  

    Is DTC U0047-00 indicated?

    YES 

    Go to step 9.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the VSA modulator-control unit .

  9. Shorted wire check (F-CAN B_H line)

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

    -2. Disconnect the following connector.

    CAN gateway 12P connector

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    EPS control unit connector B (6P): disconnected
    Multipurpose camera unit 20P connector: disconnected
    Audio unit connector E (16P) (without navigation): disconnected
    Audio-navigation unit connector E (16P) (with navigation): disconnected
    SRS unit connector A (39P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    CAN gateway 12P connector: disconnected
    Test point 1 CAN gateway 12P connector No. 12
    Test point 2 Body ground
    GHH400786Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    The F-CAN B_H wire is not short to ground. Go to step 10.

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

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    EPS control unit connector B (6P): disconnected
    Multipurpose camera unit 20P connector: disconnected
    Audio unit connector E (16P) (without navigation): disconnected
    Audio-navigation unit connector E (16P) (with navigation): disconnected
    SRS unit connector A (39P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    CAN gateway 12P connector: disconnected
    Test point 1 CAN gateway 12P connector No. 5
    Test point 2 Body ground
    GHH400787Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    The F-CAN B_L wire is not short to ground. Go to step 11.

  11. Shorted wire check (F-CAN B_H line to F-CAN B_L line)

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

    Test condition Vehicle OFF (LOCK) mode
    PCM connector A (50P): disconnected
    EPS control unit connector B (6P): disconnected
    Multipurpose camera unit 20P connector: disconnected
    Audio unit connector E (16P) (without navigation): disconnected
    Audio-navigation unit connector E (16P) (with navigation): disconnected
    SRS unit connector A (39P): disconnected
    VSA modulator-control unit 46P connector: disconnected
    CAN gateway 12P connector: disconnected
    Test point 1 CAN gateway 12P connector No. 5
    Test point 2 CAN gateway 12P connector No. 12
    GHH400788Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the F-CAN B_H wire to the F-CAN B_L wire between CAN gateway terminals No. 5 and No. 12.

    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 U0047-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .

scientia non olet · About LEMON Manuals