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
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