DTC Troubleshooting: C1423-14
DTC C1423-14: Torque Sensor Power Source Circuit Malfunction
NOTE: Before you troubleshoot, review the how to troubleshoot the EPS.

DTC Description
DTC
Freeze Frame
C1423-14 Torque Sensor Power Source Circuit Malfunction
    

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
C1423-14 Torque Sensor Power Source Circuit Malfunction
    

Is DTC C1423-14 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.
Torque sensor wire check (T/S VDD line):

Torque sensor wire check (T/S VDD line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Torque sensor 6P connector

?3.
Turn the vehicle to the ON mode.

?4.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Torque sensor input voltage
    

Is the voltage between 4.5?5.5 V?

     
YES
     
     
     
The T/S VDD wire is OK. Replace the steering gearbox.?
     
NO
     
     
     
Go to step 3.
3.
Shorted wire check (T/S VDD line):

Shorted wire check (T/S VDD line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
EPS control unit connector C (4P)

?3.
Turn the vehicle to the ON mode.

?4.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Torque sensor input voltage
    

Is the voltage between 4.5?5.5 V?

     
YES
     
     
     
Repair a short to ground in the wire between the torque sensor and the EPS motor/control unit.?
     
NO
     
     
     
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. If they are OK, replace the EPS motor/control unit.?