Infiniti Q45 (FY33). Manual - part 439

SFA962B

q

C

Check continuity between control unit con-
nector terminals

q

42

,

q

48

and shock

absorber actuator terminal

q

5

.

Continuity should exist.

OK

E

NG

Repair harness or connec-
tors.

Replace control unit.

SFA963B

SFA964B

q

D

Check continuity between control unit con-
nector terminals

q

9

,

q

25

,

q

26

,

q

34

,

q

38

,

q

39

,

q

43

,

q

44

and front shock absorber actuator con-

nector terminals

q

1

,

q

2

,

q

3

,

q

4

.

Continuity should exist.

OK

E

NG

Repair harness or connec-
tors.

Check continuity between control unit con-
nector terminals

q

27

,

q

28

,

q

29

,

q

30

,

q

35

,

q

36

,

q

37

,

q

45

and rear shock absorber actuator con-

nector terminals

q

1

,

q

2

,

q

3

,

q

4

.

Continuity should exist.

OK

E

NG

Repair harness or connec-
tors.

Replace control unit.

GI

MA

EM

LC

EC

FE

AT

PD

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

Diagnostic procedure 6 (Hard or soft feel)
(Cont’d)

H

H

H

H

H

FA-55

SFA929B

Diagnostic Procedure 7 (Heavy steering
operation during stationary turns)

SFA965B

SFA966B

SFA697BA

SFA698BA

Perform self-diagnosis to check that
vehicle speed sensor and stop lamp
switch are in good order.
When self-diagnosis is performed
using CONSULT-II, abnormalities con-
cerning stop lamp switch cannot be
displayed. Always perform self-diagno-
sis using indicator lamp located in
meter cluster.

OK

E

NG

Faulty vehicle speed sen-
sor. Go to “Diagnostic Pro-
cedure 1 (Vehicle speed
sensor)”.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Faulty stop lamp switch.
Go to “Diagnostic Proce-
dure 3 (Stop lamp switch)”.

Check control unit output signal.
1. Turn ignition switch to “ON”.
2. Measure voltage between control unit

connector terminals

q

21

and

q

24

.

Voltage:

Approx. 4 - 6V

OK

E

NG

Replace control unit.

Check continuity between control unit con-
nector terminal

q

21

and EPS solenoid valve

terminal

q

1

.

Continuity should exist.

OK

E

NG

Faulty control unit-to-EPS
solenoid valve harness.

Check continuity between EPS solenoid
valve terminal

q

2

and body ground.

Continuity should exist.

OK

E

NG

Faulty EPS solenoid valve
ground circuit.

Check EPS solenoid valve.
Disconnect EPS solenoid valve connector.
Apply battery voltage to solenoid terminal
to check that solenoid valve plunger
clicks.

OK

E

NG

Replace EPS solenoid
valve.

q

A

TROUBLE DIAGNOSES FOR SYMPTOMS

H

H

H

H

H

FA-56

SFA699BA

q

A

Measure resistance between EPS sole-
noid valve terminals

q

1

and

q

2

.

Resistance:

Approx. 4 - 6

Ω

OK

E

NG

Replace EPS solenoid
valve.

CHECK AND ADJUST STEERING
GEAR.
Adjust steering gear assembly to check
that problem is eliminated.

NG

E

OK

INSPECTION END

I

Faulty steering gear assembly

I

Faulty oil pump assembly

SFA929B

SFA965B

Diagnostic Procedure 8 (Light steering during
high-speed operation)

Perform self-diagnosis to check that
vehicle speed sensor is in good order.

OK

E

NG

Faulty vehicle speed sen-
sor. Go to “Diagnostic Pro-
cedure 1 (Vehicle speed
sensor)”.

Lift drive wheels using a jack. Start the
engine to check speedometer operation.

OK

E

NG

Faulty speedometer. Refer
to “INSPECTION/
SPEEDOMETER AND
VEHICLE SPEED SEN-
SOR” of “METER AND
GAUGES” in EL section.

Increase vehicle speed from 0 to 100
km/h (0 to 62 MPH), then measure volt-
age between control unit connector termi-
nals

q

21

and

q

24

.

Voltage:

Approx. 1.1V [0 km/h (0 MPH)]
Approx. 0.5V [100 km/h (62 MPH)]

NG

E

OK

Go to

under “Diagnos-

tic Procedure 7 (Heavy
steering operation during
stationary turns)”.

Replace control unit.

GI

MA

EM

LC

EC

FE

AT

PD

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

Diagnostic Procedure 7 (Heavy steering
operation during stationary turns) (Cont’d)

H

H

H

H

H

H

FA-57

Electrical Component Inspection

INSPECTION OF ACTIVE DAMPER SUSPENSION
CONTROL UNIT

SFA967B

Active damper suspension control unit inspection table

Terminal No.

Parts to check

Specifications

+

−

10, 19, 31

32, 40

Ground

Power supply

Turn ignition switch “ON”

Battery voltage (Approx. 12V)

8, 23, 24

Ground

—

9, 25, 26

27, 28, 29
30, 34, 35
36, 37, 38
39, 43, 44

45

Shock absorber actuator

—

42, 48

Battery voltage (Approx. 12V)

13

Select switch

“SPORT”
“AUTO”

0V
Approx. 5V

21

EPS solenoid

At 0 km/h (0 MPH)
At 100 km/h (62 MPH)

Approx. 1.1A
Approx. 0.47A

16

Indicator lamp (SPORT)

Select switch set to “SPORT”
Select switch set to “AUTO”

0V
Battery voltage
(Approx. 12V)

1, 2

Steering angle sensor

Steering wheel slowly turned to
either side from neutral

0 to 5V (Approx.) are repeated.

20

Steering wheel set to neutral

Approx. 5V

11

Stop lamp switch

Brake pedal released
Brake pedal depressed

0V
Battery voltage (Approx. 12V)

3

Vertical G sensor power supply

—

Approx. 5V

4, 5

Vertical G sensor

Vehicle standstill

Approx. 2.5V

22

Vehicle speed sensor

During extremely low speeds

0 to 5V (Approx.) are repeated.

14, 15

—

CONSULT-II

—

TROUBLE DIAGNOSES FOR ACTIVE DAMPER SUSPENSION

FA-58