Nissan Juke F15. Manual — part 1187
STC-4
< PRECAUTION >
PRECAUTIONS
• Turbocharger cooling pump may operate in a few minutes after the ignition switch is turned OFF.
• Example of high-load driving
- Driving for 30 minutes or more at 140 km/h (86 MPH) or more.
- Driving for 30 minutes or more on a steep slope.
• For vehicles with the 2-batteries, be sure to connect the main battery and the sub battery before turning ON
the ignition switch.
NOTE:
If the ignition switch is turned ON with any one of the terminals of main battery and sub battery discon-
nected, then DTC may be detected.
• After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC.
NOTE:
The removal of 12V battery may cause a DTC detection error.
Service Notice or Precautions for EPS System
INFOID:0000000012199910
• Check the following item when performing the trouble diagnosis.
- Check any possible causes by interviewing the symptom and it
′s condition from the customer if any malfunc-
tion, such as EPS warning lamp is turned ON, occurs.
- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel, and con-
trol unit is genuine part.
- Check if the connection of steering column assembly and steering gear assembly is proper (there is not
looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc).
- Check if the wheel alignment is adjusted properly.
- Check if there is any damage or modification to suspension or body resulting in increased weight or altered
ground clearance.
- Check if installation conditions of each link and suspension are proper.
- Check if the battery voltage is proper.
- Check connection conditions of each connector are proper.
- Before connecting or disconnecting the EPS control unit harness
connector, turn ignition switch “OFF” and disconnect battery
ground cable. Because battery voltage is applied to EPS control
unit even if ignition switch is turned “OFF”.
- When connecting or disconnecting pin connectors into or from
EPS control unit, take care not to damage pin terminals (bend or
break).
- When connecting pin connectors, make sure that there are no
bends or breaks on EPS control unit pin terminal.
• During quick steering, rasping noise may be heard from around the
steering wheel. This is not a malfunction. The noise is an operating
noise of the EPS system under normal conditions. If the rasping
noise occurs during slow steering, this may not be an operating
noise of the system. In this case, it is necessary to find out the
location of the noise and repair, if necessary.
SEF289H
SEF291H
COMPONENT PARTS
STC-5
< SYSTEM DESCRIPTION >
C
D
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A
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STC
N
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000012199911
*: Models with Integrated Control System
Component Description
INFOID:0000000012199912
1.
Multi display unit
*
.
2.
ABS actuator and electric unit (con-
trol unit)
Refer to
3.
ECM
Refer to
TROL SYSTEM :
Component Parts Location"
4.
Combination meter
Refer to
.
5.
EPS warning lamp
(In combination meter)
6.
EPS motor
7.
EPS control unit
8.
Reduction gear
9.
Torque sensor
A.
Steering column assembly
JSGIA0830GB
Components parts
Reference
EPS control unit
EPS motor
Torque sensor
Reduction gear
EPS warning lamp
STC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
*: Models with Integrated Control System
EPS Control Unit
INFOID:0000000012199913
• 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).
• In SPORT mode, changes the steering assist characteristic to enhance a stable steering feel according to
the mode signals from multi display unit via CAN communication. (Models with Integrated Control System)
EPS Motor
INFOID:0000000012199914
EPS motor provides the assist torque by the control signal from EPS control unit.
Torque Sensor
INFOID:0000000012199915
Torque sensor detects the steering torque, and transmit the signal to EPS control unit.
Reduction Gear
INFOID:0000000012199916
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.
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
Combination meter
• Transmits mainly the following signal to EPS control unit via
CAN communication.
- Vehicle speed signal
• Turns ON the EPS warning lamp according to the signal from
EPS control unit via CAN communication.
Multi display unit
*
• Transmits mainly the following signals to EPS control unit via
CAN communication.
- ECO mode signal
- NORMAL mode signal
- SPORT mode signal
Components parts
Reference
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
C
D
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STC
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SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
INFOID:0000000012199917
• 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).
• In SPORT mode, changes the steering assist characteristic to
enhance a stable steering feel according to the mode signals from
multi display unit via CAN communication. (Models with Integrated
Control System)
SYSTEM DIAGRAM
Multi display unit is applied to models with Integrated Control System.
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
JSGIA1102GB
JSGIA0833GB
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
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