Nissan Versa

 Sedan Service Manual

Steering » Steering control system (STC)
Unbalance steering wheel turning force and return between right and left

Description

Unbalance steering wheel turning force and return between right and left.

Diagnosis Procedure

1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP

Check the EPS warning lamp while engine is running.

Does the EPS warning lamp turn OFF?

YES >> GO TO 2.

NO >> Refer to STC"Diagnosis Procedure".

2.CHECK WHEEL ALIGNMENT

1. Check the wheel alignment. Refer to FSU "Inspection and Adjustment".
2. Perform "EPS" self-diagnosis.

Is the inspection result normal?

YES >> GO TO 3.

NO >> Adjustment of wheel alignment. Refer to FSU "Inspection and Adjustment".

3.CHECK EPS CONTROL UNIT SIGNAL

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 "DATA MONITOR" of "EPS" and select "TORQUE SENSOR".
4. Perform the torque sensor inspection.                           

Is the inspection result normal?

YES >> GO TO 5.

NO >> GO TO 4.

4.CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. Refer to STC "Diagnosis Procedure".

Is the inspection result normal?

YES >> GO TO 5.

NO >> Repair or replace the malfunctioning component.

5.CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Refer to ST "Inspection".

Is the inspection result normal?

YES >> Inspection End

NO >> Check the steering wheel turning force for mechanical malfunction. Refer to ST "Inspection".

Precautions

EPS System

Diagnosis system (EPS control unit)

EPS control unit

Diagnosis and repair workflow

C1601 Battery power supply

C1604 Torque sensor

C1606 EPS Motor

C1607, C1608 EPS Control unit

C1609 Vehicle speed signal

C1610 Engine status signal

U1000 CAN Comm circuit

EPS Warning lamp

EPS Warning lamp does not turn OFF

Steering wheel turning force is heavy or light

Unbalance steering wheel turning force and return between right and left

Unbalance steering wheel turning force (torque variation)

EPS Control unit