STC-1
STEERING
C
D
E
F
H
I
J
K
L
M
SECTION STC
A
B
STC
N
O
P
CONTENTS
STEERING CONTROL SYSTEM
BASIC INSPECTION ....................................2
DIAGNOSIS AND REPAIR WORK FLOW .........2
Work Flow .................................................................2
FUNCTION DIAGNOSIS ...............................3
EPS SYSTEM ......................................................3
System Diagram ........................................................3
System Description ...................................................3
Component Parts Location ........................................5
Component Description .............................................5
COMPONENT DIAGNOSIS ..........................6
POWER SUPPLY AND GROUND CIRCUIT .......6
Description ................................................................6
Diagnosis Procedure .................................................6
POWER STEERING SOLENOID VALVE ...........7
Description ................................................................7
Diagnosis Procedure .................................................7
Component Inspection ..............................................8
ENGINE SPEED SIGNAL CIRCUIT ....................9
Description ................................................................9
Diagnosis Procedure .................................................9
VEHICLE SPEED SIGNAL CIRCUIT .................11
Description ..............................................................11
Diagnosis Procedure ...............................................11
ECU DIAGNOSIS .........................................13
POWER STEERING CONTROL UNIT ..............13
Reference Value ......................................................13
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - ............
14
Fail-Safe ..................................................................15
SYMPTOM DIAGNOSIS ..............................17
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) .......................
17
Description ...............................................................17
Diagnosis Procedure ...............................................17
PRECAUTION ..............................................18
PRECAUTIONS .................................................18
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
18
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect ...................................
18
ON-VEHICLE REPAIR .................................19
POWER STEERING CONTROL UNIT ..............19
Exploded View .........................................................19
Removal and Installation .........................................19
Revision: 2008 October 2009 Murano