DTC Troubleshooting: U0126-00
DTC U0126-00: F-CAN Malfunction (EPS Control Unit-Steering Angle Sensor)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
U0126-00 F-CAN Malfunction (EPS Control Unit-Steering Angle Sensor)
    

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 to the ON mode.

?4.
Wait 60 seconds or more.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0126-00 F-CAN Malfunction (EPS Control Unit-Steering Angle Sensor)
    

Is DTC U0126-00 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. 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.
Disconnect the following connectors.
EPS control unit connector B (6P)
Steering angle sensor 4P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
EPS control unit connector B (6P): disconnected
 
Steering angle sensor 4P connector: disconnected
Test point 1
EPS control unit connector B (6P) No. 4
Test point 2
Steering angle sensor 4P connector No. 2

Test point 1
EPS control unit connector B (6P) No. 3
Test point 2
Steering angle sensor 4P connector No. 3


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 EPS control unit and the steering angle sensor.?
3.
Open wire check (IG1 VSA/ABS line):

Open wire check (IG1 VSA/ABS line)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
EPS control unit connector B (6P): disconnected
 
Steering angle sensor 4P connector: disconnected
Test point 1
Steering angle sensor 4P connector No. 1
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 VSA/ABS wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the No. C27 (7.5 A) fuse in the under-dash fuse/relay box and the steering angle sensor.?
4.
Open wire check (GND line):

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

?2.
Reconnect the following connectors.
EPS control unit connector B (6P)
Steering angle sensor 4P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Test point 1
Steering angle sensor 4P connector No. 4
Test point 2
Body ground


Is there 0.1 V or less?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire between the steering angle sensor and body ground (G401).?