DTC Troubleshooting: U0029-00
DTC U0029-00: F-CAN Malfunction (Bus-Off)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
U0029-00 F-CAN Malfunction (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.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0029-00 F-CAN Malfunction (Bus-Off)
    

Is DTC U0029-00 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.?
2.
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.
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?

     
EPS control unit (Bus B) is Not Available
     
     
     
Go to step 4.
     
EPS control unit (Bus B) is Available
     
     
     
Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit, then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit.?
4.
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.
Disconnect the following connectors.
EPS control unit connector B (6P)
CAN gateway 12P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EPS control unit connector B (6P): disconnected
 
CAN gateway 12P connector: disconnected
Test circuit 1
  
Test point 1
EPS control unit connector B (6P) No. 3
Test point 2
CAN gateway 12P connector (female terminals) No. 12:

Test circuit 2
  
Test point 1
EPS control unit connector B (6P) No. 1
Test point 2
CAN gateway 12P connector (female terminals) No. 5:


Is there continuity?

     
YES
     
     
     
The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit, then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit.?
     
NO
     
     
     
Repair an open in the wire between the EPS control unit and the CAN gateway.?