DTC Troubleshooting: U0131
DTC U0131: F-CAN Malfunction (PCM-EPS Control Unit)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
      

Is DTC U0131 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit and the PCM. 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.
EPS system check:

EPS system check
?1.
Check that the HDS communicates with the EPS system.

Does the HDS communicate with the EPS system?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Open wire check (F-CAN_H line):

Open wire check (F-CAN_H line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.
PCM connector A (51P)
EPS control unit connector B (6P) or B (5P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
EPS control unit connector B (6P) or B (5P): disconnected
Test point 1
EPS control unit connector B (6P) No. 4 (USA and Canada models)
 
EPS control unit connector B (5P) No. 1 (Mexico models)
Test point 2
PCM connector A (51P) No. 2

Is there continuity?

     
YES
     
     
     
The F-CAN_H wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the F-CAN_H wire between the PCM (A2) and the EPS control unit.?
4.
Open wire check (F-CAN_L line):

Open wire check (F-CAN_L line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
EPS control unit connector B (6P) or B (5P): disconnected
Test point 1
EPS control unit connector B (6P) No. 3 (USA and Canada models)
 
EPS control unit connector B (5P) No. 3 (Mexico models)
Test point 2
PCM connector A (51P) No. 1

Is there continuity?

     
YES
     
     
     
The F-CAN_L wire is OK. Update the EPS control unit if it does not have the latest software, or substitute a known-good EPS control unit, then recheck. If DTC U0131 is not indicated after substitution, replace the original EPS control unit.?
     
NO
     
     
     
Repair an open in the F-CAN_L wire between the PCM (A1) and the EPS control unit.?