DTC Troubleshooting: C1420-29
DTC C1420-29: Main Torque Sensor and Sub Torque Sensor Incorrect Correlation
NOTE: Before you troubleshoot, review the how to troubleshoot the EPS.

DTC Description
DTC
Freeze Frame
C1420-29 Main Torque Sensor and Sub Torque Sensor Incorrect Correlation
    

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.
Turn the steering wheel to the right and left several times.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C1420-29 Main Torque Sensor and Sub Torque Sensor Incorrect Correlation
    
C1421-14 Main Torque Sensor Malfunction
    
C1422-14 Sub Torque Sensor Malfunction
    

Is DTC C1420-29 indicated?

     
YES
     
     
     
Go to step 2.
     
YES
     
     
     
If DTC C1421-14 or C1422-14 are also indicated, go to DTC C1421-14 or C1422-14 troubleshooting.?
     
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 internal resistance check:

Torque sensor internal resistance check
?1.
Turn the vehicle to the OFF (LOCK) mode.

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

?3.
On the sensor side, measure the resistance between test points 1 and 2 individually (see table).
Test condition
Vehicle OFF (LOCK) mode
 
Torque sensor 6P connector: disconnected

Test Circuit
Torque Sensor
6P Connector
(male terminals):
Reference resistance value
Test point 1
Test point 2
T/S VDD - T/S GND
No. 5
No. 3
141?175 ?
TSM - T/S GND
No. 2
No. 3
179?244 ?
TSS - T/S GND
No. 4
No. 3
179?244 ?


Is the resistance OK?

     
YES
     
     
     
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