Infiniti F50. Manual — part 819
STC-1
STEERING CONTROL SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION
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
SYSTEM DESCRIPTION . . . . . . . . . .. 2
FAIL-SAFE FUNCTION . . . . . . . . . . . 2
HYDRAULIC CIRCUIT . . . . . . . . . . .. 3
Component Parts Location . . . . . . . . . ... 3
Trouble Diagnosis . . . . . . . . . . . . . . 4
STC-2
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
PFP:28500
Precautions
EGS0007V
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 trouble symptom.
2.
Engine is operation properly
Description
EGS0007W
SYSTEM DESCRIPTION
The power steering system is a twin orifice type, which uses a vehi-
cle-speed sensing, electronic control design. Solenoid valve sensi-
tivity 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 steer-
ing 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”.
SST696CA
SST697CB
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
NOTE:
On models equipped with active damper suspension system, the solenoid valve is controlled by active damper
suspension control unit, as shown in the above drawing. For
″
Wiring Diagrams
″
and
″
Trouble Diagnoses
″
of
these models. Refer to
SCS-2, "TROUBLE DIAGNOSIS FOR ACTIVE DAMPER SUSPENSION"
Component Parts Location
EGS0007X
SST838C
SGIA0042E
STC-4
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
Trouble Diagnosis
EGS0007Y
WIRING DIAGRAM
TGWM0001E
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