Nissan X-Trail 32. Manual - part 1999

STC-46

< SYMPTOM DIAGNOSIS >

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

CAUTION:

Never drive the vehicle.

2.

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

3.

Select “TORQUE SENSOR” in “DATA MONITOR” in “EPS/DAST 3”.

Is the inspection result normal?

YES-1 (Models without Stop/Start System)>>GO TO 9.
YES-2 (Models with Stop/Start System)>>GO TO 8.
NO

>> GO TO 7.

7.

CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. Refer to 

STC-31, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace the specific malfunctioning part.

8.

CHECK STOP/START SYSTEM

With CONSULT

1.

Start the engine.

CAUTION:

Never drive the vehicle.

2.

Select “ST TORQUE STATUS” and “STOP/START SYSTEM” in “DATA MONITOR” in “EPS/DAST 3”.

3.

Operate stop/start system. Refer to 

STC-18, "Reference Value"

.

4.

Turn the steering wheel.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Check the ECM. Refer to 

EC-874, "CONSULT Function"

.

9.

CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Refer to 

ST-9, "Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check the steering wheel turning force for mechanical malfunction. Refer to 

ST-26, "Inspection"

.

Monitor item 

Condition

Display value

TORQUE SENSOR

Steering wheel: Not steer-
ing (There is no steering 
force)

Approx. 0 Nm

Steering wheel: Right turn

Positive value (Nm)

Steering wheel: Left turn

Negative value (Nm)

Monitor item 

Condition

Display value

ST TORQUE STA-
TUS

Steering wheel: Not steering (There is 
no steering force)

Off

STOP/START SYS-
TEM

When stop/start system is active

On

Monitor item 

Condition

Display value

ST TORQUE STA-
TUS

Steering wheel: Right or left turn

On

STOP/START SYS-
TEM

When stop/start system is prohibited

Off

UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BETWEEN 

RIGHT AND LEFT

STC-47

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UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BE-
TWEEN RIGHT AND LEFT

Description

INFOID:0000000010688441

Unbalance steering wheel turning force and return between right and left.

Diagnosis Procedure

INFOID:0000000010688442

1.

CHECK THE ILLUMINATION OF THE ELECTRIC POWER STEERING WARNING LAMP

Check the electric power steering warning lamp while engine is running.

Does the electric power steering warning lamp turn OFF?

YES

>> GO TO 2.

NO

>> Refer to 

STC-44, "Diagnosis Procedure"

.

2.

CHECK WHEEL ALIGNMENT

1.

Check the wheel alignment. Refer to 

FSU-8, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjustment of wheel alignment. Refer to 

FSU-9, "Adjustment"

.

3.

CHECK EPS CONTROL UNIT SIGNAL

With CONSULT

1.

Start the engine.

CAUTION:

Never drive the vehicle.

2.

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

3.

Select “DATA MONITOR” of “EPS/DAST 3” and select “TORQUE SENSOR”.

4.

Perform the torque sensor inspection.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. Refer to 

STC-31, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace the specific malfunctioning part.

5.

CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Refer to 

ST-9, "Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check the steering wheel turning force for mechanical malfunction. Refer to 

ST-26, "Inspection"

.

Monitor item 

Condition

Display value

TORQUE SENSOR

Steering wheel: Not steer-
ing (There is no steering 
force)

Approx. 0 Nm

Steering wheel: Right turn

Positive value (Nm)

Steering wheel: Left turn

Negative value (Nm)

STC-48

< SYMPTOM DIAGNOSIS >

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)

Description

INFOID:0000000010688443

Unbalance steering wheel turning force (torque variation).

Diagnosis Procedure

INFOID:0000000010688444

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS/DAST 3” self-diagnosis.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

STC-21, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK THE ILLUMINATION OF THE ELECTRIC POWER STEERING WANING LAMP

Check the electric power steering warning lamp while the engine is started.

Does the electric power steering warning lamp turn OFF?

YES

>> GO TO 3.

NO

>> Refer to 

STC-42, "Diagnosis Procedure"

.

3.

CHECK STEERING COLUMN AND STEERING GEAR

Check the steering column assembly and steering gear assembly.
• Steering column assembly. Refer to 

ST-13, "Exploded View"

.

• Steering gear assembly. Refer to the following.
- LHD 

ST-20, "LHD : Exploded View"

.

- RHD 

ST-21, "RHD : 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

1.

Start the engine.

CAUTION:

Never drive the vehicle.

2.

Select “ASSIST LEVEL” in “DATA MONITOR” in “EPS/DAST 3”.

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/DAST 3”.
Dose the item in “DATA MONITOR” indicate “10.5 V” or more?

YES

>> GO TO 6.

NO

>> Perform trouble diagnosis of EPS control unit power supply and ground. Refer to 

STC-27, "Diag-

nosis Procedure"

.

6.

CHECK EPS CONTROL UNIT SIGNAL (3)

With CONSULT

1.

Select “ASSIST LEVEL” in “DATA MONITOR” in “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.

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

STC-49

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3.

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. INSPEC-

TION END

7.

CHECK EPS CONTROL UNIT SIGNAL (4)

With CONSULT

1.

Start the engine.

CAUTION:

Never drive the vehicle.

2.

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

3.

Select “TORQUE SENSOR” in “DATA MONITOR” in “EPS/DAST 3”.

4.

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-31, "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-9, "Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check the steering wheel turning force for mechanical malfunction. Refer to 

ST-11, "Inspection"

.

Monitor item 

Condition

Display value

TORQUE SENSOR

Steering wheel: Not steer-
ing (There is no steering 
force)

Approx. 0 Nm

Steering wheel: Right turn

Positive value (Nm)

Steering wheel: Left turn

Negative value (Nm)