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

Nissan Sentra B18 (2020-2025) Service Manual / Steering / Steering Control System :: Symptom Diagnosis / Unbalance Steering Wheel Turning Force and Return Between Right and Left / Diagnosis Procedure

Diagnosis Procedure

CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
1. Check the EPS warning lamp while engine is running.
Does the EPS warning lamp turn OFF?
YES>>
GO TO 2.
NO>>
Refer to Diagnosis Procedure.
CHECK WHEEL ALIGNMENT
1. 1. Check the wheel alignment. Refer to Wheel Alignment (Unladen1).
  2. Select “Self Diagnostic Result” mode of “EPS/DAST 3”.
Is the inspection result normal?
YES>>
GO TO 3.
NO>>
Adjustment of wheel alignment. Refer to Wheel Alignment (Unladen1).

CHECK EPS CONTROL UNIT SIGNAL

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”.

Perform the torque sensor inspection.

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 5.

NO>>

GO TO 4.

CHECK EPS MOTOR
1. Perform the trouble diagnosis of EPS motor. Refer to DTC Diagnosis Procedure.
Is the inspection result normal?
YES>>
GO TO 5.
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 (torque Variation)

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Other materials:

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EPS Warning lamp
Component Function Check 1.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 >> Inspection End. NO >> Perfo ...