Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Steering / Steering Control System :: Symptom Diagnosis / Steering Wheel Turning Force Is Heavy or Light / Diagnosis Procedure

Diagnosis Procedure

PERFORM SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “EPS/DAST 3”.
Is any DTC detected?
YES >>
Check the DTC. Refer to DTC Index.
NO >>
GO TO 2.
CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
1. 1. Ignition switch ON.
  2. Check that the EPS warning lamp 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 Diagnosis Procedure.
CHECK EPS CONTROL UNIT SIGNAL (1)
1. CONSULT
  1. Start the engine.
    
    CAUTION:
    
    Never drive the Nissan Sentra vehicle.
  2. Select “Assist level” in “Data Monitor” mode of “EPS/DAST 3”.
Does the item in “Data Monitor” indicate “100%”?
YES >>
GO TO 6.
NO >>
GO TO 4.
CHECK EPS CONTROL UNIT SIGNAL (2)
1. CONSULT
  
  Select “Battery voltage” in “Data Monitor” mode of “EPS/DAST 3”.
Does the item in “Data Monitor” indicate “10.5 V” or more?
YES >>
GO TO 5.
NO >>
Perform trouble diagnosis of EPS control unit power supply and ground. Refer to Diagnosis Procedure.
CHECK EPS CONTROL UNIT SIGNAL (3)
1. CONSULT
  1. Select “Assist level” in “Data Monitor” mode of “EPS/DAST 3”.
  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.
Does the symptom continue?
YES >>
GO TO 6.
NO >>
The assist torque decreases because of protection function. This is not malfunction. Inspection End.

CHECK EPS CONTROL UNIT SIGNAL (4)

CONSULT

Start the engine.

CAUTION:

Never drive the Nissan Sentra vehicle.
Turn steering wheel from full left stop to full right stop.

Select “Steering torque” in “Data Monitor” mode of “EPS/DAST 3”.

Monitor item	Condition	Display value
STEERING TORQUE	Steering wheel: Not steering (There is no steering force)	Approx. 0 Nm
	Steering wheel: Right turn	Positive value (Nm)
	Steering wheel: Left turn	Negative value (Nm)

Is the inspection result normal?

YES >>

GO TO 8.

NO >>

GO TO 7.

CHECK EPS MOTOR
1. Perform the trouble diagnosis of EPS motor. Refer to DTC Diagnosis Procedure.
Is the inspection result normal?
YES >>
GO TO 8.
NO >>
Repair or replace the specific malfunctioning part.
CHECK STEERING WHEEL TURNING FORCE
1. Check the steering wheel turning force. Refer to Inspection.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Check the steering wheel turning force for mechanical malfunction. Refer to Inspection.

Unbalance Steering Wheel Turning Force and Return Between Right and Left

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