Unbalance Steering Wheel Turning Force (Torque Variation)

Unbalance Steering Wheel Turning Force (Torque Variation)

SYMPTOM: Unbalance steering wheel turning force, while driving (Torque variation).

DIAGNOSTIC PROCEDURE

1. CHECK EPS WARNING LAMP
Confirm EPS warning lamp during engine running.
Does EPS warning lamp turn OFF?
YES >> GO TO 2.
NO >> Go to STC-21, "EPS Warning Lamp Does Not Turn OFF". EPS Warning Lamp Does Not Turn Off

2. CHECK STEERING COLUMN INTERMEDIATE SHAFT
Check the connection between intermediate shaft and the mounting part of steering column assembly and steering gear assembly.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-9, "EPS Control Unit Input/Output Signal Reference Value". EPS Control Unit Input/Output Signal Reference Value
OK or NG
OK >> GO TO 4.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

4. SYMPTOM CHECK
Check again.
OK or NG
OK >> INSPECTION END
NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to PS-6, "On-Vehicle Inspection and Service". Component Tests and General Diagnostics