DTC Troubleshooting: U0029-00
DTC U0029-00: CAN Communication Failure (Bus OFF)
NOTE:

DTC Description
DTC
Freeze Frame
U0029-00 CAN Communication Failure (Bus OFF)
    

1.
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.
Wait 2 seconds or more.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0029-00 CAN Communication Failure (Bus OFF)
    

Is DTC U0029-00 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step2.
     
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.?
2.
Open wire check (F-CAN_H, F-CAN_L lines):

Open wire check (F-CAN_H, F-CAN_L lines)
?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 connectors.
VSA modulator-control unit 38P connector
PCM connector A (51P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
VSA modulator-control unit 38P connector: disconnected
 
PCM connector A (51P): disconnected
Test circuit 1
  
Test point 1
VSA modulator-control unit 38P connector No. 38
Test point 2
L4 engine: PCM connector A (51P) No. 2
 
V6 engine: PCM connector A (51P) No. 9

Test circuit 2
  
Test point 1
VSA modulator-control unit 38P connector No. 26
Test point 2
L4 engine: PCM connector A (51P) No. 1
 
V6 engine: PCM connector A (51P) No. 10

Is there continuity?

     
YES
     
     
     
The F-CAN_H and F-CAN_L wires are OK. Go to step 3.
     
NO
     
     
     
Repair an open in the wire between the PCM and the VSA modulator-control unit.?
3.
VSA modulator-control unit check (update):

VSA modulator-control unit check (update)
?1.
Reconnect the following connectors.
VSA modulator-control unit 38P connector
PCM connector A (51P)

?2.
Update the VSA modulator-control unit if it does not have the latest software.

?3.
Turn the vehicle to the OFF (LOCK) mode, then start the engine.

?4.
Wait 2 seconds or more.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC U0029-00 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit.?
     
NO
     
     
     
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.?