Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti M45 Y34 2003-2004 Approved M45-Y34-2003 stc
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STEERING CONTROL SYSTEM
G STEERING
A
SECTION
STEERING CONTROL SYSTEM
STC B
C
D
E
CONTENTS
EPS TILT/TELESCOPIC F
ELECTRICALLY CONTROLLED POWER STEER- TILT & TELESCOPIC SYSTEM ............................... 11 .
ING SYSTEM ............................................................. 2
. System Description ................................................ 11
.
STC
Precautions ............................................................. 2
. OPERATION ....................................................... 11
.
BEFORE DIAGNOSING THE POWER STEER- Component Parts and Harness Connector Location 11 ...
ING SYSTEM, ENSURE THAT ............................ 2 . Wiring Diagram ...................................................... 12
.
Description .............................................................. 2
. BCM Input/Output Signal Standard ....................... 13 . H
SYSTEM DESCRIPTION ..................................... 2 . Preliminary Check ................................................. 14
.
FAIL-SAFE FUNCTION ........................................ 2 . POWER SUPPLY AND GROUND CIRCUIT
HYDRAULIC CIRCUIT ......................................... 3 . INSPECTION ..................................................... 14
. I
Component Parts Location ...................................... 3 . Symptom 1: Telescopic System Does Not Operate 15 ...
Wiring Diagram ....................................................... 4
. Symptom 2: Tilt System Does Not Operate ........... 18 .
Control Unit Input/Output Signal Standard .............. 6 . J
Trouble Diagnosis ................................................... 7
.
PRECAUTIONS FOR DIAGNOSIS ...................... 7 .
INSPECTION BEFORE TROUBLE DIAGNOSIS 7 .....
DIAGNOSIS PROCEDURE ................................. 7 . K
L
M
Revision; 2004 April STC-1 2003 M45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS] PFP:28500
Precautions AGS0003E
BEFORE DIAGNOSING THE POWER STEERING SYSTEM, ENSURE THAT
Vehicle Stopped
1. Power steering components (gears, oil pump, pipes, etc.) are free from leakage, and that oil level is cor-
rect.
2. Tires are inflated to specified pressure and are of specified size, and that steering wheel is a genuine Nis-
san part.
3. Suspension utilizes the original design, and is free of modifications which increase vehicle weight.
4. Wheel alignment is adjusted properly.
Vehicle In Operation
1. Understand the symptom.
2. Engine is operation properly
Description AGS0003F
SYSTEM DESCRIPTION
The power steering system is a twin orifice type, which uses a vehicle-speed sensing, electronic control
design. Solenoid valve sensitivity is controlled in response to vehicle speed to achieve optimum steering effort.
FAIL-SAFE FUNCTION
The fail-safe function operates to regulate solenoid valve operation in response to engine speed, thereby
maintaining the required steering force.
SGIA0326E
Fail-Safe Input Conditions
Fail-safe input conditions Release conditions
No vehicle speed signal entered for at least 10 seconds while
q A vehicle speed signal of greater than 1.4 km/h (0.9 MPH) is
driving at an engine speed of greater than 1,500 rpm.
entered
A vehicle speed signal of greater than 30 km/h (19 MPH) or
q Ignition switch is turned from OFF to ON.
abruptly drops below 2 km/h (1 MPH).
NOTE:
When the engine is revved up to 1,500 rpm or more for at least 10 seconds with vehicle at standstill, the fail-
safe function operates; however, this is not a matter of concern. The fail-safe function can be released by driv-
ing vehicle of a speed of greater than 1.4 km/h (0.9 MPH) or by turning ignition switch from "OFF" to "ON".
Revision; 2004 April STC-2 2003 M45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
HYDRAULIC CIRCUIT
A
B
C
D
E
F
SGIA0327E
Component Parts Location AGS0003G STC
H
I
J
SGIA0042E
K
L
M
Revision; 2004 April STC-3 2003 M45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
Wiring Diagram AGS0009N
TGWA0008E
Revision; 2004 April STC-4 2003 M45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
A
B
C
D
E
F
STC
H
I
J
K
L
M
TGWA0009E
Revision; 2004 April STC-5 2003 M45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
Control Unit Input/Output Signal Standard AGS0003I
The standard values (voltage), measured with an analog tester in contact with control unit terminal, are shown
below:
Measuring
terminal Measuring point Standard value
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