Nissan Leaf. Manual — part 1148
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
STC-37
< SYMPTOM DIAGNOSIS >
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UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Description
INFOID:0000000010119218
Unbalance steering wheel turning force (torque variation).
Diagnosis Procedure
INFOID:0000000010119219
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
NO
>> GO TO 2.
2.
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 3.
NO
>> Refer to
.
3.
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 4.
NO
>> Repair or replace the specific malfunctioning part.
4.
CHECK EPS CONTROL UNIT SIGNAL (1)
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 “ASSIST LEVEL” in “Data Monitor” of “EPS”.
Does 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” of “EPS”.
Does 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
.
6.
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.
STC-38
< SYMPTOM DIAGNOSIS >
UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
Does 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
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 9.
NO
>> GO TO 8.
8.
CHECK EPS MOTOR
Perform the trouble diagnosis of EPS motor. Refer to
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
.
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 steering (There is no
steering force)
Approx. 0 Nm
Steering wheel: Right turn
Positive value (Nm)
Steering wheel: Left turn
Negative value (Nm)
EPS CONTROL UNIT
STC-39
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
EPS CONTROL UNIT
Removal and Installation
INFOID:0000000010119220
CAUTION:
Disconnect 12V battery negative terminal before starting operations.
Never remove EPS control unit from steering column assembly. When replacing EPS control unit, replace
steering column assembly. Refer to
TM-1
TRANSMISSION & DRIVELINE
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SECTION
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CONTENTS
TRANSAXLE & TRANSMISSION
REDUCTION GEAR: RE1F61B
PRECAUTION . . . . . . . . . . . ...
PRECAUTIONS . . . . . . . . . . . . ...
Precaution for Technicians Using Medical Electric
. ..
Point to Be Checked Before Starting Maintenance
Work . . . . . . . . . . . . . . . . . . ..
Precaution for Procedure without Cowl Top Cover . ..
High Voltage Precautions . . . . . . . . . . ..
Precautions for Removing Battery Terminal . . .....
PREPARATION . . . . . . . . . . .
PREPARATION . . . . . . . . . . . . ...
Commercial Service Tools . . . . . . . . . ....
SYSTEM DESCRIPTION . . . . . . . .
STRUCTURE AND OPERATION . . . . . ...
Sectional View . . . . . . . . . . . . . . .
Power Transfer Diagram . . . . . . . . . . .
PERIODIC MAINTENANCE . . . . . . .
REDUCTION GEAR OIL . . . . . . . . .
Inspection . . . . . . . . . . . . . . . .
Draining and Refilling . . . . . . . . . . . ..
REMOVAL AND INSTALLATION . . . ...
EARTH BRUSH . . . . . . . . . . . . ..
Exploded View . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . .
Inspection . . . . . . . . . . . . . . . .
BREATHER HOSE . . . . . . . . . . . .
Exploded View . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . .
UNIT REMOVAL AND INSTALLATION . ..
REDUCTION GEAR . . . . . . . . . . ..
Exploded View . . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . .
Inspection and Adjustment . . . . . . . . . ..
SERVICE DATA AND SPECIFICATIONS
(SDS) . . . . . . . . . . . . . . .
SERVICE DATA AND SPECIFICATIONS
(SDS) . . . . . . . . . . . . . . . . .
General Specifications . . . . . . . . . . . .
Earth Brush . . . . . . . . . . . . . . . ..
ELECTRIC SHIFT
PRECAUTION . . . . . . . . . . . ..
PRECAUTIONS . . . . . . . . . . . . .
Precaution for Technicians Using Medical Electric .
Point to Be Checked Before Starting Maintenance
Work . . . . . . . . . . . . . . . . . .
Precaution for Procedure without Cowl Top Cover .
Precautions for Removing Battery Terminal . . .
General Precautions . . . . . . . . . . . .
SYSTEM DESCRIPTION . . . . . . . .
DESCRIPTION . . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . ...
COMPONENT PARTS . . . . . . . . . ..
Component Parts Location . . . . . . . . . ..
Electric Shift Control Module . . . . . . . . ...
Parking Actuator . . . . . . . . . . . . . ..
Parking Actuator Relay A . . . . . . . . . .
Electric Shift Selector . . . . . . . . . . . ..
Electric Shift Sensor . . . . . . . . . . . .
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