Infiniti Q45. Manual — part 878
TROUBLE DIAGNOSIS
STC-15
[WITHOUT REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
Diagnostic Procedure
1.
Turn ignition switch to “OFF”.
2.
Start the engine.
3.
Quickly switch the active damper suspension select switch from “SPORT” to “AUTO”, and vice versa, at
least 5 times within 10 seconds immediately after the engine has started.
4.
Read the flickering of SPORT indicator lamp. Refer to
STC-15, "Judgement Self-diagnosis"
NOTE:
When the SPORT indicator lamp flashes 1/4 Hz and continues repeating it, the system is normal.
5.
Perform the following procedures to enter the corresponding signals.
●
Turn steering wheel 180
°
in either direction from neutral.
●
Depress brake pedal.
●
Release brake pedal.
●
Move the vehicle at least 5 m (16 ft) forward.
Judgement Self-diagnosis
When a malfunction is detected, the malfunction route is indicated by flickering of the SPORT indicator lamp.
NOTE:
When the SPORT indicator lamp flashes 1/4 Hz and continues repeating it, the system is normal.
CAUTION:
Active damper suspension system shall be checked when patterns other than flickering pattern are output. Refer to
.
Disconnecting the Self-Diagnostic Function
Disconnect the self-diagnostic function using one of the following three methods:
●
Turn the ignition switch to “OFF”.
●
Drive the vehicle at speeds greater than 30 km/h (19 MPH).
●
Connect CONSULT-II.
ERASE SELF-DIAGNOSIS
Clear self-diagnostic data and fail-safe data stored in memory as follows:
●
While self-diagnosis is being performed, depress the brake pedal at least 5 times and shift the select
switch position at least 5 times. Pedal depression and switch shifting must be done within 10 seconds dur-
ing self-diagnosis.
Flickering pattern
Items
Diagnostic item is detected when...
Check item
11
Vehicle speed sensor
●
Input signal does not change for some length of while driving.
●
Input signal change abruptly while driving.
STC-19, "Vehicle
Speed Sensor
(VEHICLE SPEED
SEN)"
31
Engine speed signal
When the engine speed is 360 rpm or less, while driving.
No flickering
Active damper suspen-
sion select switch
Active damper suspension select switch circuit is shorted or
open.
SCS-49, "Active
Damper Suspen-
sion Select Switch"
SGIA1402E
STC-16
[WITHOUT REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
Inspections before Trouble Diagnosis
NGS0006E
●
Inspect for power steering fluid leakage and check the power steering fluid level. Refer to
●
Power steering components (gears, oil pump, pipes, etc.) Are free from leakage, and that oil level is cor-
rect.
●
Tires are inflated to specified pressure and are of specified size, and that steering wheel is a genuine Nis-
san part.
●
Suspension utilizes the original design, and is free of modifications which increase vehicle weight.
●
Wheel alignment is adjusted properly.
Trouble Diagnosis Chart for Symptoms
NGS0006H
When SPORT indicator lamp in the combination meter cannot be switched between ON and OFF by using active damper suspension
select switch. Refer to
STC-14, "Self-Diagnostic Procedure"
Symptom
Condition
Check item
Reference page
Hard steering when fully turning the steering
wheel.
Vehicle stopped or while
low speed driving
Vehicle speed sensor
Power steering solenoid valve
Light steering when driving at a high speed.
While high speed driving
Vehicle speed sensor
Power steering solenoid valve
TROUBLE DIAGNOSIS FOR SYSTEM
STC-17
[WITHOUT REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
TROUBLE DIAGNOSIS FOR SYSTEM
PFP:00000
Power Supply Circuit
NGS0006B
ACTIVE DAMPER SUSPENSION CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
Terminal
Wire
color
Item
Condition
Data (Approx.)
8
B
Ground
Always
0 V
10
GY
Power supply
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
19
Y/G
Power supply
(Memory back-up)
Ignition switch: ON
Battery voltage
Ignition switch: OFF
23
B
Ground
Always
0 V
24
B
Ground
Always
0 V
31
GY
Power supply
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
32
GY
Power supply
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
STC-18
[WITHOUT REAR ACTIVE STEER]
TROUBLE DIAGNOSIS FOR SYSTEM
DIAGNOSTIC PROCEDURE
1.
CHECK POWER SUPPLY
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector.
3.
Check voltage between active damper suspension control unit
harness connector (A) terminals and ground.
4.
Turn ignition switch “ON”. (Do not start engine.)
5.
Check voltage between active damper suspension control unit
harness connector (A) terminals and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check the following. If any items are damaged, repair or replace damaged parts.
●
10A fuses [No. 6, 7 located in the fuse block (J/B) No.1]. Refer to
●
Harness for short or open between battery and active damper suspension control unit harness
connector B37 terminal 19.
●
Harness for short or open between ignition switch and active damper suspension control unit
harness connector B37 terminal 10, B38 terminals 31 and 32.
●
Battery and ignition switch. Refer to
2.
CHECK GROUND CIRCUIT
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector.
3.
Check continuity between active damper suspension control unit
harness connector (A) B37 terminals 8, 23 and 24.
Also check harness for short to power.
OK or NG
OK
>> INSPECTION END
NG
>> Repair open circuit or short to power in harness or con-
nectors.
Connector
Terminal
Voltage (Approx.)
B37
10 - Ground
0 V
19 - Ground
Battery voltage
B38
31 - Ground
0 V
32 - Ground
SGIA1414E
Connector
Terminal
Voltage (Approx.)
B37
10 - Ground
Battery voltage
19 - Ground
B38
31 - Ground
32 - Ground
SGIA1420E
Continuity should exist.
SGIA1415E
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