Infiniti Q45 (FY33). Manual — part 546

SST702C

SST694C

SST695C

q

A

CHECK SOLENOID VALVE.
Disconnect power steering control unit con-
nector and solenoid valve connector.
Check power steering control unit connec-
tor terminal

q

7

and solenoid valve connec-

tor terminal

q

1

.

Continuity should exist.

OK

E

NG

Improper connection
between power steering
control unit and solenoid
valve

Check solenoid valve connector terminal

q

2

and ground.

Continuity should exist.

OK

E

NG

Improper connection
between solenoid valve and
body ground

Measure solenoid valve resistance.
Disconnect solenoid valve connector, and
measure resistance between connector
terminals (on solenoid valve side).

Resistance:

4 - 6

Ω

[at 25°C (77°F)] ... OK

0

Ω

or infinite ... NG

Disconnect solenoid valve connector.
Apply voltage between connector terminals
(on solenoid valve side) and listen for
clicks (which indicate operation).

Clicks ... OK
No clicks ... NG

OK

E

NG

Malfunctioning solenoid
valve

Check steering is operating properly.

OK

E

NG

I

Malfunctioning steering
gear assembly

I

Malfunctioning oil pump

INSPECTION END

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

BR

RS

BT

HA

EL

IDX

TWIN ORIFICE POWER STEERING SYSTEM — Trouble Diagnoses

Diagnostic Procedure (Cont’d)

H

H

H

H

H

ST-35

SST566CB

SST595CA

SST565CB

q

B

CHECK POWER STEERING CONTROL
UNIT POWER SUPPLY.
Check if power voltage is present at power
steering control unit.

YES (12V) ... OK
NG (0V) ... NG

OK

E

NG

Malfunctioning ignition
power circuit

CHECK POWER STEERING CONTROL
UNIT GROUND CIRCUIT.
Check continuity between power steering
control unit connector terminal

q

2

and

ground.
Continuity should exist.

OK

E

NG

Improper connection
between power steering
control unit and body
ground

CHECK ENGINE REVOLUTION SENSOR
INPUT SIGNAL.
Check engine revolution signal sent to
power steering control unit.

Voltage:

Idling:

5.2V ... OK

2,000 rpm (approx.):

5.2V ... OK

No voltage is present ... NG

OK

E

NG

ECM-to-power steering con-
trol unit harness or ECM
itself is faulty.

Return to item

and re-check.

TWIN ORIFICE POWER STEERING SYSTEM — Trouble Diagnoses

Diagnostic Procedure (Cont’d)

H

H

H

H

ST-36

Control Unit Inspection Table

The standard values (voltage), measured with an analog tester in
contact with the control unit terminal, are shown below:

Terminal No.

Application

Standard value

1

Power

Approx. 12V

2

Ground

0V

3

Vehicle speed sensor input

0V (min.) and 5V (max.) are
alternately repeated when
vehicle is driven at very slow
speeds.

5

Engine revolution signal input

Engine operating at idle or
2,000 rpm (approx.): 5.2V

7

Power steering solenoid valve
output

0 km/h (0 MPH): 4.4 - 6.6V
100 km/h (62 MPH): 2.5V
Fail-safe

0 - 1,500 rpm: 4.4 - 6.6V
1,500 - 3,000 rpm: 3.0V
3,000 rpm or more: 2.0V

SST995B

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

BR

RS

BT

HA

EL

IDX

TWIN ORIFICE POWER STEERING SYSTEM — Trouble Diagnoses

ST-37

General Specifications

Steering model

Power steering

Steering gear type

PR26AE

Steering overall gear ratio

18.5

Turn of steering wheel
(Lock to lock)

3.26

Steering column type

Collapsible with automatic

drive positioner

Inspection and Adjustment

STEERING WHEEL

Steering wheel axial play

mm (in)

0 (0)

Steering wheel play

mm (in)

0 - 35 (0 - 1.38)

STEERING COLUMN

Steering column length “L

1

”

mm (in)

633 - 668

(24.92 - 26.30)

Steering column lower shaft length “L

2

”

mm (in)

334.5 (13.17)

SST315B

STEERING GEAR AND LINKAGE

Steering gear type

Item

PR26AE

Tie-rod outer ball joint

Swinging force
(at cotter pin hole)

N (kg, lb)

4.9 - 46.1

(0.5 - 4.7, 1.1 - 10.4)

Rotating torque

N

⋅

m (kg-cm, in-lb)

0.29 - 2.94

(3.0 - 30.0, 2.6 - 26.0)

Axial end play

mm (in)

0 (0)

Tie-rod inner ball joint

Swinging force*

N (kg, lb)

7.8 - 65.7

(0.8 - 6.7, 1.8 - 14.8)

Rotating torque

N

⋅

m (kg-cm, in-lb)

1.0 - 7.8

(10 - 80, 8.7 - 69.4)

Axial end play

mm (in)

0 (0)

Tie-rod standard length “L”

mm (in)

182.7 (7.19) or less

*: Measuring point [



: 120 mm (4.72 in)]

SST488C

Rack stroke “S”

mm (in)

67 (2.64)

SST307BA

SERVICE DATA AND SPECIFICATIONS (SDS)

ST-38