Nissan Sentra Service Manual: 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. Refer to STC-14, "DTC Index".

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 >> Refer to STC-31, "Diagnosis Procedure".

3.CHECK STEERING COLUMN AND STEERING GEAR

Check the steering column assembly and steering gear assembly.

• Steering column assembly. Refer to ST-12, "Exploded View".

• Steering gear assembly. Refer to ST-14, "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.

Dose 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. Refer to STC-22, "Diagnosis Procedure".

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.

Dose 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. Refer to STC-27, "Diagnosis Procedure".

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. Refer to ST-5, "Inspection".

Is the inspection result normal? YES >> Inspection End.

NO >> Check the steering wheel turning force for mechanical malfunction. Refer to ST-5, "Inspection".