Nissan March K13. Manual — part 639
STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
STC-31
< SYMPTOM DIAGNOSIS >
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STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
Description
INFOID:0000000005912749
Steering wheel turning force is heavy or light.
Diagnosis Procedure
INFOID:0000000005912750
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
>> GO TO 4.
NO
>> GO TO 2.
2.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
1.
Turn the ignition switch OFF to ON.
2.
Perform “EPS” self-diagnosis.
Is any DTC detected?
YES
>> Check the DTC. Refer to
NO
>> GO TO 3.
3.
CHECK EPS CONTROL UNIT SIGNAL
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Turn steering wheel from full left stop to full right stop.
3.
Select “DATA MONITOR” of “EPS” 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
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
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Check the steering wheel turning force for mechanical malfunction. Refer to
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-32
< 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:0000000005912751
Unbalance steering wheel turning force and return between right and left.
Diagnosis Procedure
INFOID:0000000005912752
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
>> GO TO 2.
NO
>> Refer to
.
2.
CHECK WHEEL ALIGNMENT
1.
Check the wheel alignment. Refer to
.
2.
Perform “EPS” self-diagnosis.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Adjustment of wheel alignment. Refer to
3.
CHECK EPS CONTROL UNIT SIGNAL
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Turn steering wheel from full left stop to full right stop.
3.
Select “DATA MONITOR” of “EPS” 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
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
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Check the steering wheel turning force for mechanical malfunction. Refer to
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)
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
STC-33
< SYMPTOM DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Description
INFOID:0000000005912753
Unbalance steering wheel turning force (torque variation).
Diagnosis Procedure
INFOID:0000000005912754
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
>> GO TO 2.
NO
>> Refer to
.
2.
CHECK STEERING COLUMN AND STEERING GEAR
Check the steering column assembly and steering gear assembly.
• Steering column assembly. Refer to
.
• Steering gear assembly. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the specific malfunctioning part.
3.
CHECK EPS CONTROL UNIT SIGNAL
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Turn steering wheel from full left stop to full right stop.
3.
Select “DATA MONITOR” of “EPS” 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
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
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Check the steering wheel turning force for mechanical malfunction. Refer to
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-34
< REMOVAL AND INSTALLATION >
EPS CONTROL UNIT
REMOVAL AND INSTALLATION
EPS CONTROL UNIT
Exploded View
INFOID:0000000005912755
Removal and Installation
INFOID:0000000005912756
REMOVAL
CAUTION:
• Disconnect battery negative terminal before starting operations.
• Never shock EPS control unit, e.g. drop or hit.
• Never get EPS control unit wet with water or other liquid. Also, do not give EPS control unit a radical
temperature change to avoid getting water drops.
• Never disassemble or remodel EPS control unit, EPS motor, torque sensor, harness and connectors.
1.
Remove instrument lower panel LH. Refer to
2.
Disconnect EPS control unit connectors.
CAUTION:
Hold and pull the connector housing, not pulling harness, when disconnecting connectors. Also,
do not grip, collapse or apply excessive force to the connector.
3.
Remove EPS control unit from steering column assembly.
INSTALLATION
Note the following, and install in the reverse order of removal.
• Check that harness is not damaged when installing EPS control unit. Also, check that EPS control unit is
installed without trapping harness of foreign materials.
• After installing steering column assembly, perform self-diagnosis with CONSULT-III to ensure correct opera-
.
1.
Steering column assembly
2.
Bracket
3.
EPS control unit
Refer to
for symbols in the figure.
JPGIB0004GB
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