DTC U0047-00: CAN Gateway F-CAN ch B Bus Off (2014-15)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2014-15) .

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. 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. Shorted unit check (electrical servo brake control unit)

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

   - 2. Disconnect the following connector.

   Electrical serve brake control unit connector A (11P) - Refer to: Electric Servo Brake Control Unit Removal and Installation (2014-15)

   - 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 3.

   NO 

   Replace the electrical serve brake control unit - Refer to: Electric Servo Brake Control Unit Removal and Installation (2014-15) .

3. Shorted unit check (keyless access control unit)

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

   - 2. Disconnect the following connector.

   Keyless access control unit connector C (24P)

   - 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 

   Replace keyless access control unit .

4. Shorted unit check (Active noise cancellation unit)

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

   - 2. Disconnect the following connector.

   Active noise cancellation unit 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 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 5.

   NO 

   Replace the Active noise cancellation unit .

5. Shorted unit check (acoustic vehicle alerting control unit)

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

   - 2. Disconnect the following connector.

   Acoustic vehicle alerting control unit 12P 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 6.

   NO 

   Replace the acoustic vehicle alerting control unit .

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

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

   - 2. Jump the SCS line with the HDS.

   - 3. Disconnect the following connector.

   VSA modulator-control unit 21P 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 

   Go to step 7.

   NO 

   Update the VSA modulator-control unit if it does not have the latest software, or substitute a known-good VSA modulator-control unit , then recheck. If the DTC U0047-00 goes away and the VSA modulator-control unit was updated, troubleshooting is complete. If the DTC U0047-00 goes away and the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit .

7. Shorted unit check (ACC unit)

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

   - 2. Jump the SCS line with the HDS.

   - 3. Disconnect the following connector.

   ACC 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 

   Go to step 8.

   NO 

   Update the ACC unit if it does not have the latest software, or substitute a known-good ACC unit , then recheck. If the DTC U0047-00 goes away and the ACC unit was updated, troubleshooting is complete. If the DTC U0047-00 goes away and the ACC unit was substituted, replace the original ACC unit .

8. 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 (51P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2014-15)

   - 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 9.

   NO 

   Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2014-15) , then recheck. If the DTC U0047-00 goes away and the PCM was updated, troubleshooting is complete. If the DTC U0047-00 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (2014-15) .

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 24P connector - Refer to: CAN Gateway Removal and Installation (2014-15)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Electrical servo brake control unit connector A (11P): disconnected
   	Keyless access control unit connector C (24P): disconnected
   	Active noise cancellation unit 20P connector: disconnected
   	Acoustic vehicle alerting control unit 12P connector: disconnected
   	VSA modulator-control unit 21P connector
   	ACC unit 20P connector: disconnected
   	PCM connector A (51P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN B_H
   Test point 1	CAN gateway 24P connector No. 11 (GRN)
   Test point 2	Body ground

   Courtesy 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 

   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
    	Electrical servo brake control unit connector A (11P): disconnected
    	Keyless access control unit connector C (24P): disconnected
    	Active noise cancellation unit 20P connector: disconnected
    	Acoustic vehicle alerting control unit 12P connector: disconnected
    	VSA modulator-control unit 21P connector
    	ACC unit 20P connector: disconnected
    	PCM connector A (51P): disconnected
    	CAN gateway 24P connector: disconnected
    Test circuit	F-CAN B_L
    Test point 1	CAN gateway 24P connector No. 10 (LT GRN)
    Test point 2	Body ground

    Courtesy 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 

    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
    	Electrical servo brake control unit connector A (11P): disconnected
    	Keyless access control unit connector C (24P): disconnected
    	Active noise cancellation unit 20P connector: disconnected
    	Acoustic vehicle alerting control unit 12P connector: disconnected
    	VSA modulator-control unit 21P connector
    	ACC unit 20P connector: disconnected
    	PCM connector A (51P): disconnected
    	CAN gateway 24P connector: disconnected
    Test circuit	F-CAN B_H, F-CAN B_L
    Test point 1	CAN gateway 24P connector No. 11 (GRN)
    Test point 2	CAN gateway 24P connector No. 10 (LT GRN)

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

    Is there continuity?

    YES 

    Repair a short in the F-CAN B_H wire to F-CAN B_L wire between CAN gateway terminals No. 10 and No. 11.

    NO 

    Update the CAN gateway if it does not have the latest software, or substitute a known-good CAN gateway - Refer to: CAN Gateway Removal and Installation (2014-15) , then recheck. If the DTC U0029-00 goes away and the CAN gateway was updated, troubleshooting is complete. If the DTC U0029-00 goes away and the CAN gateway was substituted, replace the original CAN gateway - Refer to: CAN Gateway Removal and Installation (2014-15) .