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 .
• Information marked with an asterisk (*) applies to the CAN gateway (16P connector type).

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

   Is DTC U0029-00 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, and wait more than 1 minute.

   -3. Disconnect the following connector.

   PCM connector A (50P)

   -4. Exit the SCS mode with the HDS.

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

   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 .

3. Shorted unit check (TCM)

   -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.

   TCM 50P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 4.

   NO 

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

4. 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   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 replace the known-good VSA modulator-control unit .

5. Shorted unit check (electric brake booster)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open, then wait 3 minutes.

   NOTE:  Do not close the driver's door.

   -2. Disconnect the following connector.

   Electric brake booster 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 6 seconds.

   -7. Check for DTCs with the HDS.

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

   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 replace the electric brake booster .

6. Shorted unit check (body control module)

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

   -2. Disconnect the following connector.

   Body control module connector B (36P)

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

   Is DTC U0029-00 indicated?

   YES 

   Go to step 7.

   NO 

   Substitute a known-good body control module .

7. Shorted unit check (gauge control module)

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

   -2. Disconnect the following connector.

   Gauge control module connector A (32P)

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

   Is DTC U0029-00 indicated?

   YES 

   Go to step 8.

   NO 

   Substitute a known-good gauge control module .

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

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

   -2. Disconnect the following connector.

   CAN gateway 12P (16P)* connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	TCM 50P connector: disconnected
   	VSA modulator-control unit 46P connector
   	Electric brake booster 26P connector: disconnected
   	Body control module connector B (36P): disconnected
   	Gauge control module connector A (32P): disconnected
   	CAN gateway 12P (16P)* connector: disconnected
   Test point 1	CAN gateway 12P connector (female terminal) No. 3: CAN gateway 16P connector (female terminal) No. 3: *
   Test point 2	Body ground

   12P Connector Type 

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

   16P Connector Type* 

   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 A_H wire between the CAN gateway and the connected units.

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	TCM 50P connector: disconnected
   	VSA modulator-control unit 46P connector
   	Electric brake booster 26P connector: disconnected
   	Body control module connector B (36P): disconnected
   	Gauge control module connector A (32P): disconnected
   	CAN gateway 12P (16P)* connector: disconnected

   Test point 1	CAN gateway 12P connector (female terminal) No. 9: CAN gateway 16P connector (female terminals) No. 11: *
   Test point 2	Body ground

   12P Connector Type 

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

   16P Connector Type* 

   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 A_L wire between the CAN gateway and the connected units.

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (50P): disconnected
    	TCM 50P connector: disconnected
    	VSA modulator-control unit 46P connector
    	Electric brake booster 26P connector: disconnected
    	Body control module connector B (36P): disconnected
    	Gauge control module connector A (32P): disconnected
    	CAN gateway 12P (16P)* connector: disconnected
    Test point 1	CAN gateway 12P connector (female terminal) No. 3: CAN gateway 16P connector (female terminal) No. 3: *
    Test point 2	CAN gateway 12P connector (female terminal) No. 9: CAN gateway 16P connector (female terminals) No. 11: *

    12P Connector Type 

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

    16P Connector Type* 

    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 real time CAN gateway .

    NO 

    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. 9 (No. 3 and No. 11)*.