Nissan Versa Sedan Service ManualSteering » Steering control system (STC)
Unbalance steering wheel turning force (torque variation)
Unbalance steering wheel turning force (torque variation)
Description
Unbalance steering wheel turning force (torque variation).
Diagnosis Procedure
1.PERFORM SELF-DIAGNOSIS
With CONSULT
- Turn the ignition switch OFF to ON.
- Perform "EPS" self-diagnosis.
Is any DTC detected?
YES >> Check the DTC. Refer to STC "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 "Diagnosis Procedure".
3.CHECK STEERING COLUMN AND STEERING GEAR
Check the steering column assembly and steering gear assembly.
- Steering column assembly. Refer to ST "Exploded View".
- Steering gear assembly. Refer to ST "Exploded View".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace the malfunctioning component.
4.CHECK EPS CONTROL UNIT SIGNAL (1)
With CONSULT
- Start the engine.
CAUTION: Never drive the vehicle.
- Turn steering wheel from full left stop to full right stop.
- Select "ASSIST LEVEL" in "DATA MONITOR" in "EPS".
Does 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 "Diagnosis Procedure".
6.CHECK EPS CONTROL UNIT SIGNAL (3)
With CONSULT
- Select "ASSIST LEVEL" in "DATA MONITOR" in "EPS".
- Stop the EPS system until the item in "DATA MONITOR" becomes "100%".
NOTE: While stopping the EPS system, do not turn steering wheel.
- Check that the symptom continues.
Does the symptom continue?
YES >> GO TO 7.
NO >> The assist torque decreases because of protection function. This is not a malfunction. Inspection End.
7.CHECK EPS CONTROL UNIT SIGNAL (4)
With CONSULT
- Start the engine.
CAUTION: Never drive the vehicle.
- Turn steering wheel from full left stop to full right stop.
- Select "TORQUE SENSOR" in "DATA MONITOR" in "EPS".
- 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 "Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair or replace the malfunctioning component.
9.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".
REMOVAL AND INSTALLATION