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
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