Nissan Cube. Manual — part 921
COMPONENT PARTS
STC-5
< SYSTEM DESCRIPTION >
C
D
E
F
H
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J
K
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A
B
STC
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009945953
Component Description
INFOID:0000000009945954
1.
EPS motor
2.
Reduction gear
3.
EPS control unit
4.
Torque sensor
A.
Steering column assembly
B.
EPS warning lamp
(Combination meter)
JSGIA0662ZZ
Components parts
Reference
EPS control unit
EPS motor
Torque sensor
Reduction gear
EPS warning lamp
STC-7, "EPS SYSTEM : System Description"
ECM
• Transmits mainly the following signals to EPS control unit via
CAN communication.
- Engine status signal
ABS actuator and electric unit (control unit)
• Transmits mainly the following signal to EPS control unit via
CAN communication.
- Vehicle speed signal (ABS)
STC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
EPS Control Unit
INFOID:0000000009945955
• EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor
signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal
to the EPS motor according to the driving condition.
• EPS control unit decreases the output signal to EPS motor while extremely using the power steering func-
tion (e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection
control).
EPS Motor
INFOID:0000000009945956
EPS motor provides the assist torque by the control signal from EPS control unit.
Torque Sensor
INFOID:0000000009945957
Torque sensor detects the steering torque, and transmit the signal to EPS control unit.
Reduction Gear
INFOID:0000000009945958
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.
Combination meter
• Transmits mainly the following signal to EPS control unit via
CAN communication.
- Vehicle speed signal (Meter)
• Turns ON the EPS warning lamp according to the signal from
EPS control unit via CAN communication.
Components parts
Reference
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
INFOID:0000000009945959
• EPS control unit performs an arithmetical operation on data, such
as steering wheel turning force (sensor signal) from the torque
sensor, vehicle speed signal, etc. Then it generates an optimum
assist torque signal to the EPS motor according to the driving con-
dition.
• In case of an error in the electrical system, the fail-safe function
stops output signals to the EPS motor. Refer to
• EPS control unit decreases the output signal to EPS motor while
extremely using the power steering function (e.g., full steering)
consecutively for protecting EPS motor and EPS control unit
(Overload protection control). Refer to
• Extensive steering at low speed will cause the EPS control unit
and EPS motor to heat up, once temperature reaches critical point
EPS control unit will reduce current to reduce heat up. System will
recover as temperature lowers (reduced or no assistance).
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
JSGIA1102GB
JSGIA0877GB
Control unit
Signal status
ECM
• Transmits mainly the following signals to EPS control unit via CAN communication.
- Engine status signal
ABS actuator and electric unit (con-
trol unit)
• Transmits mainly the following signals to EPS control unit via CAN communication.
- Vehicle speed signal (ABS)
Combination meter
• Transmits mainly the following signals to EPS control unit via CAN communication.
- Vehicle speed signal (Meter)
• Receives mainly the following signals from EPS control unit via CAN communication.
- EPS warning lamp signal
STC-8
< SYSTEM DESCRIPTION >
SYSTEM
EPS WARNING LAMP INDICATION
• Turn ON when there is a malfunction in EPS system. If indicates that fail-safe mode is engaged and enters a
manual steering state (Control turning force steering wheel becomes heavy).
• Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF after the engine
starts, if system is normal.
CAUTION:
EPS warning lamp also turns ON due to data reception error, CAN communication error etc.
EPS SYSTEM : Fail-Safe
INFOID:0000000009945960
• If any malfunction occurs in the system and control unit detects the malfunction, EPS warning lamp on com-
bination meter turns ON to indicate system malfunction.
• When EPS warning lamp is ON, the system enters into a manual steering state. (Control turning force steer-
ing wheel becomes heavy.)
• Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant.
EPS SYSTEM : Protection Function
INFOID:0000000009945961
EPS control unit decreases the output signal to EPS motor while extremely using the power steering function
(e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection control).
While activating overload protection control, the assist torque gradually decreases, and the steering wheel
turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a
while.
Condition
EPS warning lamp
Ignition switch ON. (Lamp check)
ON
Engine running.
OFF
EPS system malfunction [Other diagnostic item]
ON
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