DTC U0056-00 (CAN Gateway)

DTC U0056-00  : CAN Gateway F-CAN ch C Bus Off

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

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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 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 (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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   Go to step 3.

   NO 

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

3. 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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 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 VSA modulator-control unit .

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

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

   -2. Disconnect the following connector.

   Electric servo brake control unit 22P 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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   Go to step 5.

   NO 

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

5. Shorted unit check (multipurpose camera unit)

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

   -2. Disconnect the following connector.

   Multipurpose camera 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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 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 multipurpose camera unit .

6. Shorted unit check (millimeter wave radar)

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

   -2. Disconnect the following connector.

   Millimeter wave radar 8P 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
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 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 millimeter wave radar .

7. Shorted unit check (SRS unit)

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

   -2. Disconnect the following connector.

   SRS unit connector A (39P)

   NOTE:  Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure , and wait for at least 3 minutes.

   -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 6 seconds.

   -8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 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 SRS unit .

8. Shorted wire check (F-CAN C_H line)

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

   -2. Disconnect the following connector.

   CAN gateway 16P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	EPS control unit connector B (6P): disconnected
   	VSA modulator-control unit 46P connector: disconnected
   	Electric servo brake control unit 22P connector: disconnected
   	Multipurpose camera unit 12P connector: disconnected
   	Millimeter wave radar 8P connector: disconnected
   	SRS unit connector A (39P): disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 5:
   Test point 2	Body ground

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

   Is there 1 MΩ or more?

   YES 

   Go to step 9.

   NO 

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

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

   -1. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	EPS control unit connector B (6P): disconnected
   	VSA modulator-control unit 46P connector: disconnected
   	Electric servo brake control unit 22P connector: disconnected
   	Multipurpose camera unit 12P connector: disconnected
   	Millimeter wave radar 8P connector: disconnected
   	SRS unit connector A (39P): disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 13:
   Test point 2	Body ground

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

   Is there 1 MΩ or more?

   YES 

   Go to step 10.

   NO 

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

10. Shorted wire check (F-CAN C_H line to F-CAN C_L line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition	Vehicle OFF (LOCK) mode
    	EPS control unit connector B (6P): disconnected
    	VSA modulator-control unit 46P connector: disconnected
    	Electric servo brake control unit 22P connector: disconnected
    	Multipurpose camera unit 12P connector: disconnected
    	Millimeter wave radar 8P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 5:
    Test point 2	CAN gateway 16P connector (female terminals) No. 13:

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

    Is there 1 MΩ or more?

    YES 

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

    NO 

    Repair a short in the F-CAN C_H wire to the F-CAN C_L wire between CAN gateway terminals No. 5 and No. 13.