Infiniti Q45. Manual — part 803
TROUBLE DIAGNOSIS
SCS-29
C
D
F
G
H
I
J
K
L
M
A
B
SCS
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.
Inspections Before Trouble Diagnosis
NES000AZ
Check the following items
●
Power steering fluid level. Refer to
●
Power steering fluid line for improper attachment, leaks, cracks, damage, loose connections, chafing and
deterioration. Refer to
PS-6, "Checking Fluid Leakage"
●
Tire pressure.
●
Wheel alignment. Refer to
FSU-5, "Wheel Alignment Inspection"
●
Shock absorber for oil leakage or other damage.
Trouble Diagnosis Chart for Symptoms
NES000B2
When SPORT indicator lamp in the combination meter cannot be switched between ON and OFF by using active damper suspension
select switch. Refer to
SCS-28, "Self-Diagnostic Procedure"
22
Vertical G sensor
(front)
Front vertical G sensor is malfunctioning, or signal line of front
vertical G sensor is open or shorted.
SCS-37, "Vertical
G Sensor (VERTI
G SENSOR)"
23
Vertical G sensor
(rear)
Rear vertical G sensor is malfunctioning, or signal line of rear
vertical G sensor is open or shorted.
SCS-37, "Vertical
G Sensor (VERTI
G SENSOR)"
31
Engine speed signal
When the engine speed signal is 360 rpm or less.
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"
Flickering pattern
Items
Diagnostic item is detected when...
Check item
Symptom
Condition
Check item
Reference page
Hard or soft feel.
While driving
Shock absorber actuator
Active damper suspension select switch
Shock absorber
Active damper suspension select switch
does not change.
While driving
Power supply and ground for active
damper suspension
Active damper suspension select switch
Shock absorber
SCS-30
TROUBLE DIAGNOSIS FOR SYSTEM
TROUBLE DIAGNOSIS FOR SYSTEM
PFP:00000
Power Supply Circuit
NES000CF
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
TROUBLE DIAGNOSIS FOR SYSTEM
SCS-31
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SCS
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
SCS-32
TROUBLE DIAGNOSIS FOR SYSTEM
Vehicle Speed Sensor (VEHICLE SPEED SEN)
NES000C9
●
Check the following if “VEHICLE SPEED SEN” is detected in self-diagnosis results with CONSULT-II or
“flickering pattern for 11” is detected in self-diagnosis results without CONSULT-II.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
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 oscilloscope to measure voltage for inspection, be sure not to extend forcibly any connector terminal.
Monitored item
Content
Condition
Display value
VHCL SPEED SE [km/h]
or [mph]
Wheel speed
Vehicle stopped
0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.
Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±
10%)
Terminal
Wire
color
Item
Condition
Data (Approx.)
22
PU/W
Vehicle speed
Vehicle speed: 40 km/h (25 MPH)
SEIA0775E
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