DTC Advanced Diagnostics: C1420-29

DTC C1420-29: Main Torque Sensor and Sub Torque Sensor Incorrect Correlation

NOTE

	Initial Diagnosis: The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the EPS indicator comes on, and continues until the indicator goes off.
	Regular Diagnosis: The regular on-board diagnosis begins right after the EPS indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
	Review "How to troubleshoot the EPS system" before doing the DTC troubleshooting procedure.
	Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
	The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure

Basic Condition:

Torque sensor power supply voltage 4.5 - 5.5 V

With the Driving Pattern:

1.	Start the engine.
2.	Turn the steering wheel to left and right several times, and keep holding each direction for 10 seconds.

Execution

Regular Diagnosis

Duration

About 1 second

DTC Type

	1 drive cycle
	EPS indicator on

Fail Safe Action

	Stop or continue EPS function/assist (Limited assist) (Dependant upon the conditions)
	Stop motion adaptive-EPS function/assist

Possible Cause

	EPS motor/control unit internal failure
	Steering gearbox internal failure (Torque sensor)