Nissan X-Trail 32. Manual — part 1990
STC-10
< SYSTEM DESCRIPTION >
COMPONENT PARTS
*1: With stop/start system
*2: Models around view monitor with park assist
EPS Control Unit
INFOID:0000000010688400
NOTE:
The EPS control unit, EPS motor, torque sensor, and reduction gear are integrated with the steering column
assy.
• EPS control unit
is installed to steering column assembly.
• 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.
• 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).
• When the stop/start system operation starts, the EPS control unit
receives a stop/start status signal from ECM via CAN communica-
tion and disables the assist control. (Models with stop/start system)
• When the driver turns the steering wheel (torque application exceeding the specified torque) during stop/
start system operation, the EPS control unit transmits an EPS torque signal to ECM via CAN communication
and restarts the engine (disables stop/start system). (Models with stop/start system)
• EPS control unit receives a Park Assist status signal from the around view monitor control unit and performs
around view monitor with park assist control.
• EPS control unit receives a Park Assist status signal to the around view monitor control unit to examine
whether the EPS control unit can perform around view monitor with park assist control or not.
• Around view monitor with park assist control is cancelled when the driver operates the steering wheel during
around view monitor with park assist control.
• Diagnoses can be performed with CONSULT.
EPS Motor, Torque Sensor, Reduction Gear
INFOID:0000000010688401
NOTE:
The EPS control unit, EPS motor, torque sensor, and reduction gear are integrated with the steering column
assy.
Around view monitor control unit
*2
• Transmits mainly the following signal to EPS control unit via
CAN communication.
- Park Assist status signal
- Park Assist malfunction signal
- Steering angle command signal
• Receives mainly the following signal to EPS control unit via
CAN communication.
- EPS torque signal
- Park Assist permit signal
• For detailed installation location, refer to
.
Sonar control unit
*2
• Transmits mainly the following signals to EPS control unit via
CAN communication.
- Steering angle command signal
• For detailed installation location,
: Refer to
SN-119, "Component Parts Location"
.
EPS control unit
EPS motor
STC-10, "EPS Motor, Torque Sensor, Reduction Gear"
Torque sensor
STC-10, "EPS Motor, Torque Sensor, Reduction Gear"
Reduction gear
STC-10, "EPS Motor, Torque Sensor, Reduction Gear"
No.
Component
Function
JSGIA1430ZZ
COMPONENT PARTS
STC-11
< SYSTEM DESCRIPTION >
C
D
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F
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A
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STC
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EPS motor
, torque sensor
and reduction gear
are installed
to steering column assembly.
EPS MOTOR
EPS motor provides the assist torque by the control signal from EPS control unit.
TORQUE SENSOR
Torque sensor detects the steering torque, and transmits the signal to EPS control unit.
REDUCTION GEAR
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.
JSGIA1431ZZ
STC-12
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
INFOID:0000000010688402
DESCRIPTION
• EPS system consists mainly of EPS system, EPS motor, torque
sensor, and reduction gear.
• EPS system calculates a control signal to transmit to the EPS
motor based on information received from ECM, ABS actuator and
electric unit (control unit), around view monitor control unit, and
combination meter via CAN communication and information
received from torque sensor.
• 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.
• When the driver turns the steering wheel (torque application
exceeding the specified torque) during stop/start, the EPS control
unit restarts the engine (disables stop/start system) and immedi-
ately brings the assist control in its ready-to-start state.
• If EPS becomes out of order, the power steering warning lamp
blinks and the Stop/Start System brings about such conditions as
follows (Models with stop/start system):
- Stop/start mode is not enabled under non stop/start state.
- The engine is restarted during stop/start, regardless of steering
wheel operation. (Models with stop/start system)
• The around view monitor with park assist function assists garaging
and parallel parking and allows automatic operation of the steering
wheel when the system starts.
• When an error in the electrical system, the fail-safe function stops output signals to the EPS motor. Refer to
STC-14, "EPS SYSTEM : Fail-Safe"
.
• 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). Refer to
SYSTEM DIAGRAM
NOTE:
JSGIA1102GB
SYSTEM
STC-13
< SYSTEM DESCRIPTION >
C
D
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F
H
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A
B
STC
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Around view monitor control unit and sonar control unit: Models around view monitor with park assist
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
*1: With stop/start system
*2: Models around view monitor with park assist
ELECTRIC POWER STEERING 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).
JSGIA1557GB
Control unit
Signal status
ECM
• Transmits mainly the following signals to EPS control unit via CAN communication.
- Engine status signal
- EPS assist request signal
*1
- Stop/start status signal
*1
• Receives mainly the following signal to EPS control unit via CAN communication.
- EPS operation signal
- Stop/start inhibit signal
*1
ABS actuator and electric unit (con-
trol unit)
• Transmits the following signal to EPS control unit via CAN communication.
- Vehicle speed signal (ABS)
Combination meter
• Transmits the following signal to EPS control unit via CAN communication.
- Vehicle speed signal (Meter)
• Receives the following signal from EPS control unit via CAN communication.
- Electric power steering warning lamp
Around view monitor control unit
*2
• Transmits mainly the following signal to EPS control unit via CAN communication.
- Park Assist status signal
- Park Assist malfunction signal
- Steering angle command signal
• Receives mainly the following signal to EPS control unit via CAN communication.
- EPS torque signal
- Park Assist permit signal
Sonar control unit
*2
• Transmits the following signal to EPS control unit via CAN communication.
- Steering angle command signal
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