DTC Troubleshooting: U0126-00
DTC U0126-00: CAN Communication Failure With Absolute Steering Wheel Angle Sensor
NOTE:

DTC Description
DTC
Freeze Frame
U0126-00 CAN Communication Failure With Absolute Steering Wheel Angle Sensor
    

1.
DTC check:

DTC check
?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)
    
U0126-00 CAN Communication Failure With Absolute Steering Wheel Angle Sensor
    

Is DTC U0126-00 indicated?

     
YES
     
     
     
If only DTC U0126-00 is indicated, go to step 2.
     
YES
     
     
     
If DTC U0029-00 is also indicated, go to DTC U0029-00.?
     
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.
Disconnect the following connectors.
VSA modulator-control unit 38P connector
Steering angle sensor 4P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
VSA modulator-control unit 38P connector: disconnected
 
Steering angle sensor 4P connector: disconnected
Test point 1
VSA modulator-control unit 38P connector No. 38
Test point 2
Steering angle sensor 4P connector No. 2

Test point 1
VSA modulator-control unit 38P connector No. 26
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 VSA modulator-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
 
VSA modulator-control unit 38P connector: 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.
VSA modulator-control unit 38P connector
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
     
     
     
The GND wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the wire between the steering angle sensor and body ground (G401).?
5.
Steering angle sensor check (substitution):

Steering angle sensor check (substitution)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Substitute a known-good steering angle sensor.

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Turn the vehicle to the OFF (LOCK) mode, then start the engine.

?6.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U0126-00 CAN Communication Failure With Absolute Steering Wheel Angle Sensor
    

Is DTC U0126-00 indicated?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
VSA modulator-control unit check (update):

VSA modulator-control unit check (update)
?1.
Update the VSA modulator-control unit if it does not have the latest software.

?2.
Turn the vehicle to the OFF (LOCK) mode, then start the engine.

?3.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC U0126-00 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.?