Nissan March K13. Instruction — part 633
SYSTEM
STC-7
< SYSTEM DESCRIPTION >
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SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
INFOID:0000000005912711
• 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.
• In case of an error in the electrical system, the fail-safe function stops output signals to the EPS motor. Then
the previous state is changed to the instruction steering state.
• Self-diagnosis can be done with CONSULT-III.
• EPS control unit will decrease assistance under the following 2 conditions.
- Extensive steering at low speed will cause the ECU and MOTOR to heat up, once temperature reaches crit-
ical point ECU will reduce current to reduce heat up. System will recover as temperature lowers (reduced or
no assistance).
- Holding steering on rack-end (full lock) for 1 second will cause the system to engage rack-end protection.
This reduces assistance down to 50% in order to prevent heat up. Assistance is immediately returned to
100% when steering released or turned away from rack-end.
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
*1
: With ABS models
JPGIB0005GB
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)
*1
Transmits mainly the following signals to EPS control unit via CAN communication.
• Vehicle speed signal
*1
Combination meter
Transmits mainly the following signals to EPS control unit via CAN communication.
• Vehicle speed signal
EPS warning lamp signal is received from the EPS control unit via CAN communication.
STC-8
< SYSTEM DESCRIPTION >
SYSTEM
EPS WARNING LAMP INDICATION
CAUTION:
EPS warning lamp also turns ON due to data reception error, CAN communication error etc.
EPS SYSTEM : Fail-Safe
INFOID:0000000005912779
• 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, enters into a instruction steering state. (Control turning force steering wheel
becomes heavy.)
EPS SYSTEM : Protection Function
INFOID:0000000006021884
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 reactivates by no steering.
Condition
EPS warning lamp
Ignition switch ON. (Lamp check)
ON
Engine running.
OFF
EPS system malfunction [Other diagnostic item]
ON
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
STC-9
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
CONSULT-III Function
INFOID:0000000005912713
FUNCTION
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
ECU IDENTIFICATION
Displays the part number stored in the control unit.
SELF-DIAG RESULTS MODE
Display Item List
.
DATA MONITOR MODE
Display Item List
Diagnostic test mode
Function
ECU identification
Steering column assembly number can be read.
Self diagnostic result
Self-diagnostic results can be read and erased quickly.
Data monitor
Input/Output data in the EPS control unit can be read.
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.
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)
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.
VEHICLE SPEED (km/h) or (MPH)
Vehicle speed is displayed from vehicle speed signal via CAN communication.
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.
STC-10
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
ECU DIAGNOSIS INFORMATION
EPS CONTROL UNIT
Reference Value
INFOID:0000000005912714
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The output signal indicates the EPS control unit calculation data. The normal values will be displayed
even in the event that the output circuit (harness) is open.
*1: Almost in accordance with the value of MOTOR SIG. It is not a malfunction though these values are not accorded when steering
quickly.
*2: A fixed value is indicated regardless of steering turning.
*3: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls. However, it returns to 100%
when left standing.
*4: It is not a malfunction, though it might not be corresponding just after ignition switch in turned ON.
Monitor item
Display content
Data monitor
Condition
Display value
BATTERY VOLT
Power supply voltage for
EPS control unit
Ignition switch: ON
Battery voltage
TORQUE SENSOR
Steering wheel turning
force
Engine running
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)
MOTOR CURRENT
Consumption current of
EPS motor
Engine running
Steering wheel: Not steering
(There is no steering force)
Approx. 0 A
Steering wheel: Right or left
turn
Displays consumption cur-
rent of EPS motor (A)
*1
MOTOR SIG
Command current to
EPS motor
Engine running
Steering wheel: Not steering
(There is no steering force)
Approx. 0 A
Steering wheel: Right turn
Negative value (A)
Steering wheel: Left turn
Positive value (A)
ASSIST TORQUE
Displays assist torque
being output by the EPS.
Engine running
Approx. 0 Nm
*2
C/U TEMP
Displays temperature of
the EPS control unit.
Ignition switch ON or engine running
Displays temperature of in-
side of EPS control unit (
°
C)
ASSIST LEVEL
Assist available level
Engine running
100 %
*3
VEHICLE SPEED
Vehicle speed
Vehicle stopped
0 km/h (0 mph)
While driving
Approximately equal to the
indication on speedometer
(inside of
±
10%)
*4
WARNING LAMP
EPS warning lamp con-
dition
EPS warning lamp: ON
On
EPS warning lamp: OFF
Off
ENGINE STATUS
Engine status
Engine not running
Stop
Engine running
Run
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