Nissan Note E12. Instruction — part 596
PRECAUTIONS
STC-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
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The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SR and SB section of
this Service Instruction.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the
battery and wait at least three minutes before performing any service.
Service Notice and Precautions for EPS System
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• Check the following item when performing the trouble diagnosis:
- Check for possible causes of the malfunction by interviewing the customer as to what conditions were
present when the symptom occurred.
- Check if the steering wheel and the EPS control unit are genuine parts.
- Check if the air pressure and size of each tire is correct.
- Check if the installation of the links and suspension components are correct.
- Check if the tires are worn evenly, indicating the wheel alignment is correct.
- Check if the installation of the steering column and the steering gear are correct. Check for loose bolts, dam-
aged links, cracked boots and leaking grease, etc.
- Check for damage or modification to suspension or body resulting in increased weight or altered ground
clearance.
- Check if the battery voltage is proper.
- Check the EPS control unit harness to be sure the harness connectors are fully seated.
• Before connecting or disconnecting the EPS control unit harness connector, turn ignition switch “OFF” and
disconnect the battery cable from the negative terminal. Battery voltage is applied to the EPS control unit
even if ignition switch is turned “OFF”.
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< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
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A.
Steering column assembly
No.
Component
Function
1.
Combination meter
(EPS warning lamp)
• 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.
• For detailed installation location, refer to
SYSTEM : Component Parts Location"
.
2.
ABS actuator and electric unit (control unit)
• Transmits mainly the following signal to EPS control unit via
CAN communication.
- Vehicle speed signal (ABS)
• For detailed installation location, refer to
.
3.
ECM
• Transmits mainly the following signals to EPS control unit
via CAN communication.
- Engine status signal
• For detailed installation location, refer to
CONTROL SYSTEM : Component Parts Location"
.
• Receives mainly the following signal from EPS control unit
via CAN communication.
- EPS torque signal
ALGIA0166ZZ
COMPONENT PARTS
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< SYSTEM DESCRIPTION >
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EPS Control Unit
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• EPS control unit (1) 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).
EPS Motor, Torque Sensor, Reduction Gear
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EPS motor (1), torque sensor (2) and reduction gear (3) 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.
4.
EPS motor
Refer to
STC-5, "EPS Motor, Torque Sensor, Reduction
.
Reduction gear
Refer to
STC-5, "EPS Motor, Torque Sensor, Reduction
.
5.
EPS control unit
Refer to
6.
Torque sensor
Refer to
STC-5, "EPS Motor, Torque Sensor, Reduction
.
No.
Component
Function
JSGIA0852ZZ
JSGIA0853ZZ
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< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
CONSULT Function
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FUNCTION
CONSULT can display each diagnostic item using the diagnostic test modes shown following.
*: The following diagnosis information is erased by erasing.
• DTC
• Freeze frame data (FFD)
ECU IDENTIFICATION
Displays the part number stored in the control unit.
SELF-DIAG RESULTS MODE
.
When “CRNT” is displayed on self-diagnosis result.
• The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result.
• System malfunction in the past is detected, but the system is presently normal.
FREEZE FRAME DATA (FFD)
The following vehicle status is recorded when DTC is detected and is displayed on CONSULT.
DATA MONITOR MODE
*1: Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not
accorded when steering quickly.
Diagnostic test mode
Function
ECU identification
The part number stored in the control unit can be read.
Self diagnostic result
Self-diagnostic results and freeze frame data can be read and erased quickly.
*
Data monitor
Input/Output data in the EPS control unit can be read.
Item name
Display item
IGN COUNTER
(0-39)
The number of times that ignition switch is turned ON after the DTC is detected is displayed.
• When “0” is displayed: It indicates that the system is presently malfunctioning.
• When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system is pres-
ently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1
→2→3...38→39.
When the operation number of times exceeds 39, the number does not increase and “39” is displayed until self-
diagnosis is erased.
Monitor item (Unit)
Remarks
BATTERY VOLT (V)
Displays the power supply voltage for EPS control unit.
TORQUE SENSOR (Nm)
Displays steering wheel turning force detected by torque sensor.
MOTOR CURRENT (A)
Displays the current value consumed by EPS motor.
*1
MOTOR SIG (A)
Displays the current commanded value to EPS motor.
ASSIST TORQUE (Nm)
Displays assist torque being output by the electric power steering.
C/U TEMP (
°C or °F )
Displays the temperature of the EPS control unit.
ASSIST LEVEL (%)
Normally displays 100%. In case of an excessive stationary steering, the assist
curvature gradually falls. However, it return to 100% when left standing.
*2
VEHICLE SPEED (km/h or MPH)
Vehicle speed is displayed from vehicle speed signal via CAN communication.
*3
WARNING LAMP (On/Off)
EPS warning lamp control status is displayed.
ENGINE STATUS (Stop/Run)
Engine speed is displayed from engine status signal via CAN communication.
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