Nissan Leaf. Manual — part 1147

EPS WARNING LAMP DOES NOT TURN OFF

STC-33

< SYMPTOM DIAGNOSIS >

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EPS WARNING LAMP DOES NOT TURN OFF

Description

INFOID:0000000010119212

EPS warning lamp does not turn OFF several seconds after the vehicle is READY state.

Diagnosis Procedure

INFOID:0000000010119213

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn the power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is any DTC detected?

YES

>> Check the DTC. Refer to

STC-14, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK EPS WARNING LAMP

Perform the trouble diagnosis of EPS warning lamp. Refer to

STC-31, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the specific malfunctioning part.

3.

CHECK EPS CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

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

STC-23, "Diagnosis Pro-

cedure"

.

Is the inspection result normal?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Repair or replace the specific malfunctioning part.

STC-34

< SYMPTOM DIAGNOSIS >

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

Description

INFOID:0000000010119214

Steering wheel turning force is heavy or light.

Diagnosis Procedure

INFOID:0000000010119215

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn the power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
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 that the EPS warning lamp turns ON when power switch turns ON. Then, EPS warning lamp turns OFF

after the vehicle is READY state.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble diagnosis of EPS warning lamp. Refer to

STC-31, "Diagnosis Procedure"

.

3.

CHECK EPS CONTROL UNIT SIGNAL (1)

With CONSULT

1. Set the vehicle to READY.

2. Select “ASSIST LEVEL” in “Data Monitor” of “EPS”.
Does the item in “Data Monitor” indicate “100%”?

YES

>> GO TO 6.

NO

>> GO TO 4.

4.

CHECK EPS CONTROL UNIT SIGNAL (2)

With CONSULT

Select “BATTERY VOLT” in “Data Monitor” of “EPS”.
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

STC-23, "Diag-

nosis Procedure"

.

5.

CHECK EPS CONTROL UNIT SIGNAL (3)

With CONSULT

1. Select “C/U TEMP” in “Data Monitor” of “EPS”.

2. Stop the EPS system until the item in “Data Monitor” becomes “85

°C (185°F)” or less.

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.

6.

CHECK EPS CONTROL UNIT SIGNAL (4)

With CONSULT

1. Set the vehicle to READY.

CAUTION:

Never drive the vehicle.

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

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT

STC-35

< SYMPTOM DIAGNOSIS >

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3. Select “TORQUE SENSOR” in “Data Monitor” in “EPS”.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

CHECK EPS MOTOR

Perform the trouble diagnosis of EPS motor. Refer to

STC-27, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace the specific malfunctioning part.

8.

CHECK STEERING WHEEL TURNING FORCE

Check the steering wheel turning force. Refer to

ST-33, "Inspection"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

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

ST-44, "Inspection"

.

Monitor item

Condition

Display value

TORQUE SENSOR

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)

STC-36

< SYMPTOM DIAGNOSIS >

UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BETWEEN

RIGHT AND LEFT

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

Description

INFOID:0000000010119216

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

Diagnosis Procedure

INFOID:0000000010119217

1.

CHECK THE ILLUMINATION OF THE EPS WARNING LAMP

Check the EPS warning lamp while the vehicle is READY state.
Does the EPS warning lamp turn OFF?

YES

>> GO TO 2.

NO

>> Refer to

STC-33, "Diagnosis Procedure"

.

2.

CHECK WHEEL ALIGNMENT

Check the wheel alignment. Refer to

FSU-11, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Adjustment of wheel alignment. Refer to

FSU-11, "Inspection"

.

3.

CHECK EPS CONTROL UNIT SIGNAL

With CONSULT

1. Set the vehicle to READY.

CAUTION:

Never drive the vehicle.

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

3. Select “TORQUE SENSOR” in “Data Monitor” of “EPS”.

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-27, "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-33, "Inspection"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

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

ST-44, "Inspection"

.

Monitor item

Condition

Display value

TORQUE SENSOR

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)