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

DTC Troubleshooting: U0029-00, U0047-00

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.

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

Problem verification:

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	Freeze Frame
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. 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.?

DTC check (CAN gateway system):

DTC check (CAN gateway system)

?1.

Check for CAN gateway system DTCs with the HDS.

DTC Description	DTC

Is DTC indicated?


	YES

Go to indicated DTC's troubleshooting.?


	NO

Go to step 3.

F-CAN circuit communication check:

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.

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.?

Open wire check (F-CAN A_H, F-CAN A_L lines):

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

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	VSA modulator-control unit 46P connector: disconnected
	CAN gateway 12P connector: disconnected
Test circuit 1
Test point 1	VSA modulator-control unit 46P connector No. 40
Test point 2	CAN gateway 12P connector (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 (female terminals) No. 9:

Is there continuity?


	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.?

Open wire check (F-CAN B_H, F-CAN B_L lines):

Open wire check (F-CAN B_H, F-CAN B_L lines)

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

?2.