Infiniti M45 (Y34). Manual — part 794
STC-1
STEERING CONTROL SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION
STC
A
B
STC
STEERING CONTROL SYSTEM
EPS
ELECTRICALLY CONTROLLED POWER STEER-
ING SYSTEM . . . . . . . . . . . . . . . .. 2
Precautions . . . . . . . . . . . . . . . .. 2
BEFORE DIAGNOSING THE POWER STEER-
ING SYSTEM, ENSURE THAT . . . . . . . . 2
Description . . . . . . . . . . . . . . . ... 2
PRECAUTIONS FOR DIAGNOSIS . . . . . ... 7
INSPECTION BEFORE TROUBLE DIAGNOSIS
DIAGNOSIS PROCEDURE . . . . . . . . .. 7
TILT/TELESCOPIC
TILT & TELESCOPIC SYSTEM . . . . . . . . 11
System Description . . . . . . . . . . . . . 11
OPERATION . . . . . . . . . . . . . . 11
Component Parts and Harness Connector Location
POWER SUPPLY AND GROUND CIRCUIT
INSPECTION . . . . . . . . . . . . . .. 14
STC-2
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
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.
Fail-Safe Input Conditions
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”.
SGIA0326E
Fail-safe input conditions
Release conditions
No vehicle speed signal entered for at least 10 seconds while
driving at an engine speed of greater than 1,500 rpm.
●
A vehicle speed signal of greater than 1.4 km/h (0.9 MPH) is
entered
●
Ignition switch is turned from
″
OFF
″
to
″
ON
″
.
A vehicle speed signal of greater than 30 km/h (19 MPH) or
abruptly drops below 2 km/h (1 MPH).
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
STC-3
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
HYDRAULIC CIRCUIT
Component Parts Location
AGS0003G
SGIA0327E
SGIA0042E
STC-4
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
Wiring Diagram
AGS0009N
TGWA0008E
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