Unbalance Steering Wheel Turning Force (Torque Variation)

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

Description

Unbalance steering wheel turning force (torque variation).


Diagnosis Procedure


1. PERFORM SELF-DIAGNOSIS

With CONSULT
1.Turn the ignition switch OFF to ON.
2.Perform "EPS" self-diagnosis.
Is any DTC detected?
YES- Check the DTC. Testing and Inspection.
NO- GO TO 2.

2. CHECK THE ILLUMINATION OF THE EPS WARNING LAMP

Check the EPS warning lamp while the engine is started.
Does the EPS warning lamp turn OFF?
YES- GO TO 3.
NO- EPS Warning Lamp.

3. CHECK STEERING COLUMN AND STEERING GEAR

Check the steering column assembly and steering gear assembly.
- Steering column assembly. Exploded View.
- Steering gear assembly. Exploded View.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace the specific malfunctioning part.

4. CHECK EPS CONTROL UNIT SIGNAL (1)

With CONSULT
1.Start the engine.

CAUTION:
Never drive the vehicle.
2.Turn steering wheel from full left stop to full right stop.
3.Select "ASSIST LEVEL" in "DATA MONITOR" in "EPS".
Does the item in "DATA MONITOR" maintain "100%"?
YES- GO TO 7.
NO- GO TO 5.

5. CHECK EPS CONTROL UNIT SIGNAL (2)

With CONSULT
Select "BATTERY VOLT" in "DATA MONITOR" in "EPS".
Does the item in "DATA MONITOR" indicate "10 V" or more?
YES- GO TO 6.
NO- Perform trouble diagnosis of EPS control unit power supply and ground. C1601.

6. CHECK EPS CONTROL UNIT SIGNAL (3)

With CONSULT
1.Select "ASSIST LEVEL" in "DATA MONITOR" in "EPS".
2.Stop the EPS system until the item in "DATA MONITOR" becomes "100%".
NOTE:
While stopping the EPS system, do not turn steering wheel.
3.Check that the symptom continues.
Does the symptom continue?
YES- GO TO 7.
NO- The assist torque decreases because of protection function. This is not malfunction. INSPECTION END

7. CHECK EPS CONTROL UNIT SIGNAL (4)

With CONSULT
1.Start the engine.

CAUTION:
Never drive the vehicle.
2.Turn steering wheel from full left stop to full right stop.
3.Select "TORQUE SENSOR" in "DATA MONITOR" in "EPS".
4.Perform the torque sensor inspection.





Is the inspection result normal?
YES- GO TO 9.
NO- GO TO 8.

8. CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. C1606.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace the specific malfunctioning part.

9. CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Inspection.
Is the inspection result normal?
YES- INSPECTION END
NO- Check the steering wheel turning force for mechanical malfunction. Inspection.