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STC

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STEERING CONTROL SYSTEM

G STEERING

SECTION
STEERING CONTROL SYSTEM
STC B

E
CONTENTS
PRECAUTIONS ......................................................... 2
. TYPE 7/TYPE 8 .................................................. 20 . F
Precautions for Supplemental Restraint System TYPE 9/TYPE 10/TYPE 11/TYPE 12 ................. 23 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TYPE 13/TYPE 14 .............................................. 25 .
SIONER" ................................................................. 2
. Correct and Quick Diagnosis ................................. 27 . STC
Maintenance Information ......................................... 2 . CHECK THE FOLLOWING ITEMS WITH THE
RHD MODELS ..................................................... 2. VEHICLE STOPPED. ......................................... 27 .
LHD MODELS ...................................................... 2
. CHECK THE FOLLOWING ITEMS WITH THE
H
PREPARATION .......................................................... 3
. VEHICLE RUNNING. .......................................... 27 .
Special Service Tools .............................................. 3
. Basic Inspection .................................................... 27 .
ON-VEHICLE SERVICE ............................................ 4 . BASIC INSPECTION 1 INSPECTION OF
Steering Angle Adjustment (WORK SUPPORT) ..... 4 POWER SUPPLY SYSTEM TERMINAL LOOSE- I
OPERATION PROCEDURE ................................ 4 . NESS AND BATTERY ........................................ 27 .
SYSTEM DESCRIPTION ........................................... 5 . BASIC INSPECTION 2 INSPECTION OF ELEC-
System Component Parts Location ......................... 5 . TRIC POWER STEERING WARNING LAMP .... 27 . J
Electric Power Steering Function ............................ 5 . Inspection 1: Battery Voltage Is Incorrect .............. 27 .
Fail-Safe Function ................................................... 5
. Inspection 2: No Setting ........................................ 28 .
TROUBLE DIAGNOSIS ............................................. 6 . Inspection 3: Steering Angle Has Not Been
K
Diagnosis Procedure ............................................... 6
. Adjusted. ................................................................ 29
.
BASIC CONCEPT ................................................ 6 . Inspection 4: Torque Sensor Malfunction .............. 29 .
Component Parts Location ...................................... 7 . Inspection 5: Steering Angle Sensor Malfunction ... 29
Wiring Diagram ....................................................... 8
. Inspection 6: Motor Malfunction .............................. 29 L
Control Unit Input/Output Signal Standard .............. 9 . Inspection 7: EEPROM Malfunction ...................... 30 .
STANDARD WHEN USING CIRCUIT TESTER 9 ..... Inspection 8: Control Unit Malfunction ................... 30 .
STANDARD VALUES WITH CONSULT-II ............ 9 . Inspection 9: CAN Communication System ........... 30 . M
CONSULT-II Function (EPS) ..................................11 . Symptom 1: Steering Wheel Operation Is Heavy or
DESCRIPTION ....................................................11. Light ....................................................................... 30
.
CONSULT-II BASIC OPERATION .......................11 . Symptom 2: Steering Force and Steering Wheel
SELF-DIAG RESULTS ....................................... 12 . Return Force Are Different in Right and Left. Steer-
DATA MONITOR ................................................ 12 . ing Wheel Is Pulled to One Side ............................ 31 .
CONTROL UNIT PART NUMBER ..................... 13 . Symptom 3: Steering Wheel Does Not Return Prop-
CAN Communication ............................................. 14 . erly ......................................................................... 32
.
SYSTEM DESCRIPTION ................................... 14 . Symptom 4: Steering Effort Is Uneven (Torque Vari-
CAN Communication Unit ..................................... 14 . ation) ...................................................................... 32
.
TYPE 1/TYPE 2 ................................................. 15. Symptom 5: EPS Warning Lamp Keeps Illuminating 33 ...
TYPE 3/TYPE 4/TYPE 5/TYPE 6 ....................... 18 .

STC-1
PRECAUTIONS

PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EGS000LM

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 SRS and SB section of
this Service Manual.
WARNING:
q 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 per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Maintenance Information EGS000LN

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
PREPARATION

PREPARATION PFP:00002
A
Special Service Tools EGS000JF

Description Application
B

CONSULT-II unit, and C
Program card AED02E

PBIA3527J D
For system diagnosis, and checks

E
CONSULT-II CONVERTER

F
PBIA3526J

STC

STC-3
ON-VEHICLE SERVICE

ON-VEHICLE SERVICE PFP:00000

Steering Angle Adjustment (WORK SUPPORT) EGS000JG

q If steering column or steering gear is installed or removed, make sure to adjust steering angle.
CAUTION:
Use CONSULT-II to adjust steering angle. (Adjustment cannot be achieved without using CON-
SULT-II.)
OPERATION PROCEDURE
1. Connect CONSULT-II and CONVERTER to data link connector. Refer to STC-11, "CONSULT-II BASIC
OPERATION" .
2. Touch "EPS", "WORK SUPPORT", and "EPS CALIBRATION".
3. Start engine.
4. Set steering wheel to straight-ahead position.
5. Turn steering wheel to right until it stops.
6. Return steering wheel to straight-ahead position.
CAUTION:
Error should be within

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