DTC U0029-00, U0047-00 (VSA Control Unit (With CAN Gateway))

DTC U0029-00  : CAN Communication Failure (Bus OFF Ch 1)DTC U0047-00  : CAN Communication Failure (Bus OFF Ch 2)

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

*1: CAN gateway 12P connector type

*2: CAN gateway 16P connector type

DTC (VSA)

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, then start the engine.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Communication Failure (Bus OFF Ch 1)
   U0047-00 CAN Communication Failure (Bus OFF Ch 2)

   Is DTC U0029-00 or U0047-00 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

2. DTC check (CAN gateway system)

   -1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC

   Are DTC (s) indicated?

   YES 

   Go to indicated DTC's troubleshooting.

   NO 

   Go to step 3.

3. F-CAN circuit communication check

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   VSA modulator-control unit (Bus A) is Not Available

   Go to step 4.

   VSA modulator-control unit (Bus B) is Not Available

   Go to step 5.

   VSA modulator-control unit (Bus A and B) is Available

   Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

4. Open wire check (F-CAN A H, F-CAN A L lines)

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

   -2. Disconnect the following connectors.

   VSA modulator-control unit 46P connector

   CAN gateway 12P connector *1

   CAN gateway 16P connector *2

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   	CAN gateway 12P connector *1: disconnected
   	CAN gateway 16P connector *2: disconnected
   Test circuit 1
   Test point 1	VSA modulator-control unit 46P connector No. 40
   Test point 2	CAN gateway 12P connector *1 (female terminals) No. 3:
   	CAN gateway 16P connector *2 (female terminals) No. 3:

   Test circuit 2
   Test point 1	VSA modulator-control unit 46P connector No. 28
   Test point 2	CAN gateway 12P connector *1 (female terminals) No. 9:
   	CAN gateway 16P connector *2 (female terminals) No. 11:

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

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN A H and F-CAN A L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Repair an open in the wire between the VSA modulator-control unit and the CAN gateway.

5. Open wire check (F-CAN B H, F-CAN B L lines)

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

   -2. Disconnect the following connectors.

   VSA modulator-control unit 46P connector

   CAN gateway 12P connector *1

   CAN gateway 16P connector *2

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   	CAN gateway 12P connector *1: disconnected
   	CAN gateway 16P connector *2: disconnected
   Test circuit 1
   Test point 1	VSA modulator-control unit 46P connector No. 46
   Test point 2	CAN gateway 12P connector *1 (female terminals) No. 12:
   	CAN gateway 16P connector *2 (female terminals) No. 6:

   Test circuit 2
   Test point 1	VSA modulator-control unit 46P connector No. 34
   Test point 2	CAN gateway 12P connector *1 (female terminals) No. 5:
   	CAN gateway 16P connector *2 (female terminals) No. 14:

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

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN B H and F-CAN B L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Repair an open in the wire between the VSA modulator-control unit and the CAN gateway.