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Nissan Sentra Service Manual: Steering wheel turning force is heavy or light

Nissan Sentra Service Manual / Steering / Steering control system / Symptom diagnosis / Steering wheel turning force is heavy or light

Description

Steering wheel turning force is heavy or light.

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 that the EPS warning lamp turns ON when ignition switch turns ON. Then, EPS warning lamp turns OFF after the engine is started.

Is the inspection result normal? YES >> GO TO 3.

NO >> Perform trouble diagnosis of EPS warning lamp. Refer to STC-31, "Diagnosis Procedure".

3.CHECK EPS CONTROL UNIT SIGNAL (1)

With CONSULT


  1. Start the engine.

CAUTION:

Never drive the vehicle.

  1. Select ASSIST LEVEL in DATA MONITOR in EPS.

Dose the item in DATA MONITOR indicate 100%? YES >> GO TO 6.

NO >> GO TO 4.

4.CHECK EPS CONTROL UNIT SIGNAL (2)

Select BATTERY VOLT in DATA MONITOR in EPS. With CONSULT


Select BATTERY VOLT in DATA MONITOR in EPS.

Dose the item in DATA MONITOR indicate 10 V or more? YES >> GO TO 5.

NO >> Perform trouble diagnosis of EPS control unit power supply and ground. Refer to STC-22, "Diagnosis Procedure".

5.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.

  1. Check that the symptom continues.

Dose the symptom continue? YES >> GO TO 6.

NO >> The assist torque decreases because of protection function. This is not malfunction. Inspection End.

6.Check EPS Control unit signal (4)

With CONSULT


  1. Start the engine.

CAUTION:

Never drive the vehicle.

  1. Turn steering wheel from full left stop to full right stop.

  2. Select TORQUE SENSOR in DATA MONITOR in EPS.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 8.

NO >> GO TO 7.

7.CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. Refer to STC-27, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 8.

NO >> Repair or replace the specific malfunctioning part.

8.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-8, "Inspection".

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