Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Primera 2000.2005 Approved Nissan Note 2006 STC
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STEERING CONTROL SYSTEM
G STEERING
A
SECTION
STEERING CONTROL SYSTEM
STC B
C
D
E
CONTENTS
EPS For Fast and Accurate Trouble Diagnosis ............. 13 . F
Basic Inspection .................................................... 13
.
PRECAUTIONS ......................................................... 2
. BASIC INSPECTION 1: POWER SUPPLY CIR-
Maintenance Information ......................................... 2 . CUIT TERMINAL LOOSENESS AND BATTERY 13 ... STC
RHD MODELS ..................................................... 2. BASIC INSPECTION 2: EPS WARNING LAMP
LHD MODELS ...................................................... 2
. INSPECTION ..................................................... 13
.
SYSTEM DESCRIPTION ........................................... 3 . BASIC INSPECTION 3: EPS CONTROL UNIT
Components ............................................................ 3
. H
POWER SUPPLY CIRCUIT AND GROUND CIR-
Electric Power Steering Function ............................ 3 . CUIT INSPECTION ............................................ 14 .
Fail-Safe Function ................................................... 3
. Inspection 1: Battery Voltage Malfunction ............. 15 .
TROUBLE DIAGNOSIS ............................................. 4 . Inspection 2: Torque Sensor Malfunction .............. 16 . I
How to Perform Trouble Diagnosis ......................... 4 . Inspection 3: Motor Malfunction ............................. 17 .
BASIC CONCEPT ................................................ 4 . Inspection 4: EEPROM Malfunction ...................... 18 .
Component Parts Location ...................................... 5 . Inspection 5: Control unit malfunction ................... 18 . J
Schematic ............................................................... 6
. Inspection 6: Vehicle Speed Signal Malfunction .... 19 .
Wiring Diagram -- EPS -- ...................................... 7 . Inspection 7: Engine Signal Malfunction ................ 19 .
Control Unit Input/Output Signal Standard ............ 10 . Inspection 8: CAN Communication Circuit ............ 20 .
CIRCUIT TESTER REFERENCE VALUE .......... 10 . K
Symptom 1: Steering is Heavy or Light ................. 20 .
STANDARD BY CONSULT-II ............................. 10 . Symptom 2: There is a Difference in the Steering
CONSULT-II Function (EPS) ..................................11 . Turning/Returning Force of Left and Right (Biased
CONSULT-II MAIN FUNCTION ...........................11 . to One Side) .......................................................... 21
. L
CONSULT-II START PROCEDURE ....................11 . Symptom 3: Steering Wheel Turning Force is
SELF-DIAGNOSIS ..............................................11 . Uneven (Torque Variation) ..................................... 21 .
DATA MONITOR ................................................ 12 . Symptom 4: EPS Warning Lamp Stays ON ........... 22 . M
ECU PART NUMBER ......................................... 13 .
CAN COMMUNICATION .................................... 13 .
STC-1
PRECAUTIONS
[EPS]
PRECAUTIONS
[EPS] PFP:00001
Maintenance Information BGS0004A
If any of following part is replaced, always replace with new* one.
If it's not (or fail to do so), the electrical system may not be operated properly.
*: New one means a virgin control unit that has never been energized on-board.
RHD MODELS
q BCM (Models without Intelligent Key system)
q Intelligent Key unit (Models with Intelligent Key system)
q ECM
q IPDM E/R
q Combination meter
q EPS control unit
LHD MODELS
q BCM (Models without Intelligent Key system)
q Intelligent Key unit (Models with Intelligent Key system)
q ECM
STC-2
SYSTEM DESCRIPTION
[EPS]
SYSTEM DESCRIPTION PFP:00000
A
Components BGS0002W
B
C
D
E
F
STC
SGIA1304E
1. Steering wheel 2. Motor 3. EPS control unit
4. Steering gear assembly 5. Torque sensor 6. Reduction gear H
A. Sensor processing signal B. Sensor signal C. Assist torque signal (motor drive)
D. Ignition power E. CAN (H) F. CAN (L)
G. Power supply H. Ground I
Electric Power Steering Function BGS0002X
Parts name Function J
q Outputs optimum assist torque signal to motor by steering wheel turning force
(sensor signal) from torque sensor and vehicle speed signal from CAN communi-
cation.
K
q Reduces output signals to motor and protects motor and EPS control unit when
using power steering continuously and excessively.
Electric power steering (EPS) control unit
q Under unusual conditions of electric system, fail-safe function starts, output sig-
L
nal to motor is turned off, and then changes to manual steering. EPS warning
lamp turns on to indicate system error.
q Controls communication with other control units by using CAN communication.
q Allows system diagnosis with CONSULT-II
M
Motor q Produces assist torque by control signal from EPS control unit.
q Detects steering wheel turning force and outputs sensor signal to EPS control
Torque sensor
unit.
q Increases motor-produced assist torque by worm gear and transmits it to column
Reduction gear
shaft.
q Turns on when fail-safe function operates, and indicates manual steering state.
EPS warning lamp q Turns on when key switch is turned on to check value, and turns off after engine
starts
Fail-Safe Function BGS0002Y
In case an unusual condition is encountered in the system, fail-safe function stops EPS control and the system
enters a fail-safe state. EPS warning lamp turns on to indicate unusual state, and enters a manual steering
state. (Control turning force of steering wheel becomes heavy.)
STC-3
TROUBLE DIAGNOSIS
[EPS]
TROUBLE DIAGNOSIS PFP:00004
How to Perform Trouble Diagnosis BGS0002Z
BASIC CONCEPT
q The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.
q It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
CAUTION:
Customers are not professionals. Do not assume "maybe
customer means..." or "maybe customer mentioned this
symptom".
SEF234G
q It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform inspection on ad hoc basis. Most intermittent
malfunctions are caused by poor contacts. In this case, it will be
effective to shake suspected harness or connector by hand.
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
q After diagnosis, make sure to perform "ERASE MEMORY".
Refer to STC-11, "Erase Memory" . SEF233G
q Always read "GI General Information" to confirm general precau-
tions. Refer to GI-4, "General Precautions" .
STC-4
TROUBLE DIAGNOSIS
[EPS]
Component Parts Location BGS00030
A
B
C
D
E
F
STC
H
I
J
K
L
M
MGIB0003E
1. Motor 2. EPS control unit 3. Torque sensor (built-in)
4. Reduction gear (built-in) 5. EPS warning lamp A. Sensor processing signal
B. Sensor signal C. Assist torque signal (motor drive) D. Ignition power
E. CAN (H) F. CAN (L) G. Power supply
H. Ground
STC-5
TROUBLE DIAGNOSIS
[EPS]
Schematic BGS00031
MGWA0006E
STC-6
TROUBLE DIAGNOSIS
[EPS]
Wiring Diagram -- EPS -- BGS00032
A
B
C
D
E
F
STC
H
I
J
K
L
M
MGWA0005E
STC-7
TROUBLE DIAGNOSIS
[EPS]
MGWA0007E
STC-8
TROUBLE DIAGNOSIS
[EPS]
A
B
C
D
E
F
STC
H
I
J
K
L
M
MGWA0008E
STC-9
TROUBLE DIAGNOSIS
[EPS]
Control Unit Input/Output Signal Standard BGS00033
CIRCUIT TESTER REFERENCE VALUE
CAUTION:
When checked using a circuit tester for voltage measurement, connector terminals should not be
forcefully extended.
Terminal
Measuring point Measuring condition Standard
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