Unbalance Steering Wheel Turning Force (Torque Variation)

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

Diagnosis Procedure


1. PERFORM SELF-DIAGNOSIS

With CONSULT
Perform "EPS" self-diagnosis.
Is a malfunctioning system displayed?
YES- Check malfunctioning system. Refer to "DTC Index" A L L Diagnostic Trouble Codes ( DTC ).
NO- GO TO 2.

2. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (1)

With CONSULT
1.Start the engine.

CAUTION:
Never drive the vehicle.
2.Turn the steering wheel until it stops.
3.Select "MTR ASSIST" in "DATA MONITOR" of "EPS".
Is the display value "100%"?
YES- GO TO 4.
NO- GO TO 3.

3. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (2)

With CONSULT
1.Select "C/U TEMP" and "C/U TEMP A" in "DATA MONITOR" of "EPS".
2.Stop the system until the DATA MONITOR display value drops to "90�C (194�F)" or less.
3.Check whether symptom continues.
Did symptom continue?
YES- GO TO 4.
NO- This occurs because the protection function lowers the assist force. It is not a system malfunction.
Inspection End.

4. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (3)

With CONSULT
1.Turn the steering wheel to the straight-ahead position. (There is no steering force.)
2.Select "BATTERY VOLT" in "DATA MONITOR" of "EPS".
Is the display value "10.5 V" or more?
YES- GO TO 5.
NO- Check the battery power system. Refer to "Diagnosis Procedure" C1601.

5. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (4)

With CONSULT
Select in "ESTM VHCL SPD" in "DATA MONITOR" of "EPS".





*: This may not agree with the speedometer indication immediately after the ignition switch is turned ON. This is not a malfunction.
Is the check result normal?
YES- GO TO 6.
Revision: March 20122013 Infiniti JX
NO- Check the combination meter, ABS actuator and electric unit (control unit). Refer to "CONSULT Function (METER/M&A)" Consult Function and "CONSULT Function" Scan Tool Testing and Procedures.

6. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (5)

With CONSULT
Select "STR ANG SPD" in "DATA MONITOR" of "EPS".





Is the check result normal?
YES- GO TO 7.
NO- Check the steering angle sensor. Refer to "Diagnosis Procedure" C1143.

7. CHECK THE POWER STEERING CONTROL MODULE SIGNAL (6)

With CONSULT
Select "ENGINE STATUS" in "DATA MONITOR" of "EPS".
Is the display value "RUN"?
YES- GO TO 8.
NO- Check the ECM. Refer to "CONSULT Function" Consult Function.

8. CHECK STEERING COLUMN AND STEERING GEAR

Check the steering column assembly and steering gear assembly.
- Steering column assembly. Refer to "Steering Column" [1][2]Specifications.
- Steering gear assembly. Refer to "Power Steering Gear" [1][2]Specifications.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace malfunctioning component.

9. CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Refer to "Diagnosis Procedure" Steering Wheel Turning Force Is Heavy or Light.
Is the inspection result normal?
YES- Inspection End.
NO- Check the steering wheel turning force for mechanical malfunction. Refer to "Diagnosis Procedure" Steering Wheel Turning Force Is Heavy or Light.
Revision: March 20122013 Infiniti JX