Infiniti Q45 (FY33). Manual - part 438

SFA936B

SFA948B

SFA949B

SFA950B

SFA951B

Diagnostic Procedure 5 (SPORT indicator does
not come on when ignition switch is turned
on.)

Disconnect control unit connector, then
re-connect it securely. Turn ignition switch
to “ON” and check that indicator lamp illu-
minates.

NG

E

OK

INSPECTION END

CHECK POWER CIRCUIT.
1. Turn ignition switch to “ON”.
2. Measure voltage between control unit

connector terminal

q

40

and body ground.

Voltage:

Battery voltage

OK

E

NG

Faulty power circuit.

CHECK SELECT SWITCH CIRCUIT.
1. Disconnect control unit connector.
2. Check continuity between control unit

body harness connector terminal

q

13

and

body ground.
Continuity:

AUTO: Continuity should exist.
SPORT: Continuity should not

exist.

OK

E

NG

q

A

CHECK INDICATOR LAMP CIRCUIT.
Short control unit body harness connector
terminal

q

16

to body ground to check that

indicator lamp illuminates.

Yes

E

No

q

B

CHECK CONTROL UNIT GROUND CIR-
CUIT.
Check continuity between control unit
body harness connector terminal

q

24

and

body ground.
Continuity should exist.

OK

E

NG

Faulty control unit ground
circuit.

Replace control unit.

GI

MA

EM

LC

EC

FE

AT

PD

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

H

H

H

H

H

FA-51

SFA952B

SFA953B

q

A

CHECK SELECT SWITCH CIRCUIT.
Check continuity between control unit
body harness connector terminal

q

13

and

select switch body harness connector ter-
minal

q

1

.

Continuity should exist.

OK

E

NG

Faulty control unit-to-select
switch harness.

CHECK SELECT SWITCH GROUND
CIRCUIT.
Check continuity between select switch
body harness connector terminal

q

2

and

body ground.
Continuity should exist.

OK

E

NG

Faulty select switch ground
circuit.

Replace select switch.

SFA954B

SFA955B

q

B

CHECK INDICATOR LAMP CIRCUIT.
Check continuity between control unit
body harness connector terminal

q

16

and

indicator lamp body harness connector
terminal

q

2

.

Continuity should exist.

OK

E

NG

Faulty control unit-to-indi-
cator lamp harness.

CHECK INDICATOR LAMP.
Check continuity between indicator lamp
meter connector terminals

q

41

and

q

2

.

Continuity should exist.

OK

E

NG

Replace indicator lamp.

Faulty power circuit.

TROUBLE DIAGNOSES FOR SYMPTOMS

Diagnostic Procedure 5 (SPORT indicator does
not come on when ignition switch is turned
on.) (Cont’d)

H

H

H

H

H

H

FA-52

SFA956B

Diagnostic procedure 6 (Hard or soft feel)

SFA957B

SFA958B

SFA959B

Disconnect control unit connector and
shock absorber actuator connector, then
re-connect them. Perform self-diagnosis to
check that proper test results are
obtained.

OK

E

NG

Check and repair faulty
area.

CHECK SHOCK ABSORBER ACTUA-
TOR OPERATION.
1. Set the diagnostic system in the self-

diagnosis mode.

2. Set select switch to “AUTO”, then move

vehicle body up and down to check that
dampening force of each shock
absorber is high. Brake pedal should be
released during tests.

3. Set select lever to “SPORT”, then move

vehicle body up and down to check that
dampening force of each shock
absorber is low.

NG

E

OK

q

A

CHECK SHOCK ABSORBER ACTUA-
TOR.
Measure resistance between shock
absorber actuator terminals

q

1

and

q

5

,

q

2

and

q

5

, and

q

3

and

q

5

, and

q

4

and

q

5

.

Resistance:

Approx. 9.4

Ω

OK

E

NG

Replace shock absorber
actuator.

CHECK CONTROL UNIT OUTPUT SIG-
NAL.
1. Turn ignition switch to “ON”.
2. Measure voltage between control unit

connector terminals

q

42

,

q

48

and body

ground.
Voltage: Battery voltage

OK

E

NG

q

C

q

B

GI

MA

EM

LC

EC

FE

AT

PD

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

H

H

H

H

FA-53

SFA960BA

SFA961B

q

B

CHECK SHOCK ABSORBER ACTUA-
TOR OPERATION.
1. Remove actuator from strut.
2. Set diagnostic system in the self-diag-

nostic mode.

3. Check that actuator operates as

depicted in the figure at left when select
switch is set to “AUTO” or “SPORT”,
and brake pedal is depressed or
released.

OK

E

NG

q

D

CHECK SHOCK ABSORBER CONTROL
ROD.
Pinch control rod with your fingers, then
turn it 2 or 3 rotations to check that it
rotates smoothly without free play.

OK

E

NG

Replace shock absorber.

1. Install actuator and perform self-diagno-

sis.

2. Turn ignition switch to “ON” to initialize

actuator positioning, then re-perform
self-diagnosis to check actuator opera-
tion. (Refer to

.)

NG

E

OK

INSPECTION END

1. Replace with a new actuator, then per-

form self-diagnosis.

2. Turn ignition switch to “ON” to initialize

actuator positioning, then re-perform
self-diagnosis to check actuator opera-
tion. (Refer to

.)

NG

E

OK

Replace actuator.

Replace shock absorber.

q

A

Check for improved riding comfort.

OK

E

NG

Replace shock absorber.

INSPECTION END

TROUBLE DIAGNOSES FOR SYMPTOMS

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

H

H

H

H

H

H

H

FA-54