Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2003_Q45 stc

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stc

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STEERING CONTROL SYSTEM

G STEERING

B
SECTION
STEERING CONTROL SYSTEM C

E
CONTENTS
EPS HYDRAULIC CIRCUIT ......................................... 3 . F
Component Parts Location ...................................... 3.
ELECTRICALLY CONTROLLED POWER STEER- Trouble Diagnosis .................................................... 4
.
ING SYSTEM ............................................................. 2
. WIRING DIAGRAM .............................................. 4. STC
Precautions ............................................................. 2
. PRECAUTIONS FOR DIAGNOSIS ...................... 6 .
BEFORE DIAGNOSING THE POWER STEER- INSPECTION BEFORE TROUBLE DIAGNOSIS 6 .....
ING SYSTEM, ENSURE THAT ............................ 2 . DIAGNOSIS PROCEDURE ................................. 6 .
Description .............................................................. 2
. H
Control Unit Inspection Table ................................... 9
.
SYSTEM DESCRIPTION ..................................... 2 .
FAIL-SAFE FUNCTION ........................................ 2 .
I

Revision; 2004 April STC-1 2003 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS] 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.

SST696CA

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.

SST697CB

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 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
HYDRAULIC CIRCUIT
A

STC

SST838C I
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 J
these models. Refer to SCS-2, "TROUBLE DIAGNOSIS FOR ACTIVE DAMPER SUSPENSION" .
Component Parts Location EGS0007X

SGIA0042E

Revision; 2004 April STC-3 2003 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
Trouble Diagnosis EGS0007Y

WIRING DIAGRAM

TGWM0001E

Revision; 2004 April STC-4 2003 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]

STC

TGWM0002E

Revision; 2004 April STC-5 2003 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
PRECAUTIONS FOR DIAGNOSIS
Intermittent problems may be caused by malfunctioning harness, harness connector or terminal. Move har-
nesses, harness connectors or terminals by hand to make sure that there is no contact malfunction.
If a circuit tester for measuring voltage is used for check, be careful not to forcibly spread any connector termi-
nals.
INSPECTION BEFORE TROUBLE DIAGNOSIS
q Check power steering fluid level and check for any leak. Refer to PS-6, "POWER STEERING FLUID" .

DIAGNOSIS PROCEDURE
Symptom:
q Heavy steering operation during stationary turns
q Light steering operation during high-speed driving
Inspection procedure
1. CHECK VEHICLE SPEED SIGNAL
q Start engine and gradually increase the vehicle speed from 0 to
100 km/h (0 to 62 MPH).
q Measure voltage between power steering control unit terminal 3
(PU/W) and body ground.
q Check that voltage changes from approximately 5.5V to approx-
imately 2.5V. Refer to STC-2, "SYSTEM DESCRIPTION" .
Is the result OK?
OK >> GO TO 5.
NG >> GO TO 2.
SGIA0046E

2. CHECK ENGINE SPEED SIGNAL
q When engine is running at idle, change the engine speed to approximately 1,600 rpm and then to approx-
imately 3,000 rpm.
q Measure voltage between power steering control unit terminal 5 (W/G) and body ground.
q Check that voltage changes from approximately 5.5V to approximately 2.1V in steps. Refer to STC-2,
"SYSTEM DESCRIPTION" .
Is the result OK?
OK >> GO TO 3.
NG >> GO TO 9.

3. CHECK SPEEDOMETER AND VEHICLE SPEED SENSOR
q Check speedometer for proper operation.
q Check that vehicle speed sensor is not regarded as malfunction in the self-diagnosis of A/T (ECM).
Is the result OK?
OK >> GO TO 4.
NG >> q Check meter and any malfunctioning parts.
CAUTION:
If rear wheels are rotated when they are off the ground, the ABS wheel speed sensor is
malfunctioning is display on the screen.

Revision; 2004 April STC-6 2003 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[EPS]
4. CHECK VEHICLE SPEED SIGNAL INPUT A
q With rear wheels raised, rotate them by hand.
q Measure voltage between terminals on power steering control unit.
B
When the wheels are rotated slowly by hand:
3 (PU/W )

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