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
-
Turn the ignition switch OFF to ON.
-
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
-
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.
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
-
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.
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
-
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-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".
Unbalance steering wheel turning force and return between right
and left
Description
Unbalance steering wheel turning force and return between right
and left.
Diagnosis Procedure
1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
Check the EPS warning lamp while engine ...
Removal and installation
EPS control unit
Exploded View
Steering column assembly
EPS control unit
Bracket plate
Front
Removal and Installation
REMOVAL
CAUTION:
Disconnect battery negative terminal ...
Other materials:
Front wiper drive assembly
Exploded view
Wiper blade (RH)
Wiper arm (RH)
Wiper drive assembly
Wiper arm (LH)
Wiper blade (LH)
Removal and installation
REMOVAL
Remove the cowl top. Refer to EXT-26, "Removal and Installation".
Disconnect the harness connector from the wiper drive assembly.
...
Diagnosis system (ipdm e/r) (without intelligent key system)
Diagnosis Description
AUTO ACTIVE TEST
Description
In auto active test, the IPDM E/R sends a drive signal to the following
systems to check their operation.
Front wiper (LO, HI)
Parking lamp
License plate lamp
Tail lamp
Front fog lamp (if equipped)
Headlamp (LO, HI)
A/C compress ...
Basic inspection
Diagnosis and repair work flow
Work flow
Overall sequence
Detailed flow
1.Get information for symptom
Get the detailed information from the customer about the symptom (the
condition and the environment when
the incident/malfunction occurred) using the “diagnostic work sheet”. ( ...
