Infiniti Q45. Manual — part 804
TROUBLE DIAGNOSIS FOR SYSTEM
SCS-33
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DIAGNOSTIC PROCEDURE
1.
CHECK VEHICLE SPEED SENSOR
With CONSULT-II
1.
Start engine.
2.
Select “DATA MONITOR” mode for “ACT D/SUS” with CONSULT-II.
3.
Read out the value of “VHCL SPEED SE”.
Without CONSULT-II
1.
Start engine.
2.
Check signal between active damper suspension control unit
harness connector (A) terminal and ground with oscilloscope.
OK or NG
OK >> GO
TO
4.
NG
>> GO TO 2.
2.
CHECK COMBINATION METER
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector.
3.
Check signal between combination meter harness connector (A)
terminal and ground with oscilloscope.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Check combination meter. Refer to
.
Condition
Display value
Vehicle stopped
0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition.
Approximately
equal to the indi-
cation on speed-
ometer (Inside of
±
10%)
SGIA1404E
Connector
Terminal
Condition
Data (Approx.)
B37
22 -
Ground
Vehicle speed:
40 km/h (25 MPH)
SGIA1407E
SEIA0775E
Connector
Terminal
Condition
Data (Approx.)
M41
18 -
Ground
Vehicle speed:
40 km/h (25 MPH)
SGIA1408E
SEIA0775E
SCS-34
TROUBLE DIAGNOSIS FOR SYSTEM
3.
CHECK HARNESS BETWEEN ACTIVE DAMPER SUSPENSION CONTROL UNIT AND COMBINA-
TION METER
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector and the combination meter harness
connector.
3.
Check continuity between active damper suspension control unit
harness connector (A) B37 terminal 22 and combination meter
harness connector (B) M41 terminal 18.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
4.
CHECK ACTIVE DAMPER SUSPENSION CONTROL UNIT
Check active damper suspension control unit input/output signal. Refer to
SCS-20, "Active Damper Suspen-
sion Control Unit Input/Output Signal Reference Values"
OK or NG
OK
>> GO TO 5.
NG
>> Check active damper suspension control unit pin terminals for damage or loose connection with
harness connector. If any items are damaged, repair or replace damaged parts.
5.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK
>> INSPECTION END
NG
>> Replace active damper suspension control unit. Refer to
SCS-60, "Removal and Installation"
Steering Angle Sensor (STEERING ANGLE SEN)
NES000CA
●
Check the following if “STEERING ANGLE SEN” is detected in self-diagnosis results with CONSULT-II or
“flickering pattern for 12 or 13” is detected in self-diagnosis results without CONSULT-II.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
Continuity should exist.
SGIA1409E
Monitored item
Content
Condition
Display value
STEERING ANG [
°
]
Steering angle detected
by steering angle sensor
Steering wheel right turned
0
°
- R128
°
Straight-ahead
Approx. 0
°
Steering wheel left turned
0
°
- L128
°
NEUTRAL SIG [ON/OFF]
Neutral condition of
steering wheel
Straight-ahead
ON
Steering wheel turned
OFF
TROUBLE DIAGNOSIS FOR SYSTEM
SCS-35
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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.
DIAGNOSTIC PROCEDURE
1.
CHECK VEHICLE STEERING ANGLE SENSOR
With CONSULT-II
1.
Start engine.
2.
Select “DATA MONITOR” mode for “ACT D/SUS” with CONSULT-II.
3.
Read out the value of “STEERING ANG” and “NEUTRAL SIG”.
Without CONSULT-II
1.
Start engine.
2.
Check signal between active damper suspension control unit
harness connector (A) terminals and ground.
OK or NG
OK >> GO
TO
5.
NG
>> GO TO 2.
Terminal
Wire
color
Item
Condition
Data (Approx.)
1
L/R
Steering angle sensor 1
Steering wheel turned slowly
Repeats 0 - 5 V
Steering wheel stopped
0 V
2
Y/B
Steering angle sensor 2
Steering wheel turned slowly
Repeats 0 - 5 V
Steering wheel stopped
0 V
20
G/R
Steering angle sensor
(neutral)
Engine running
Straight-ahead
5 V
Steering wheel turned
0 V
Monitored item
Condition
Display value
STEERING ANG
Steering wheel right
turned
0
°
- R128
°
Straight-ahead
Approx. 0
°
Steering wheel left turned
0
°
- L128
°
NEUTRAL SIG
Straight-ahead
ON
Steering wheel turned
OFF
SEIA0705E
Connector
Terminal
Condition
Data
(Approx.)
B37
1 -
Ground
Steering wheel turned slowly
Repeats
0 - 5 V
Steering wheel stopped
0 V
2 -
Ground
Steering wheel turned slowly
Repeats
0 - 5 V
Steering wheel stopped
0 V
20 -
Ground
Engine running
Straight-ahead
5 V
Steering wheel turned
0 V
SEIA0706E
SCS-36
TROUBLE DIAGNOSIS FOR SYSTEM
2.
CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT
Perform self-diagnosis with VDC/TCS/ABS control unit. Refer to
BRC-24, "SELF-DIAG RESULT MODE"
.
Is any malfunction detected by self-diagnosis?
YES
>> Check the malfunctioning system.
NO
>> GO TO 3.
3.
CHECK HARNESS BETWEEN ACTIVE DAMPER SUSPENSION CONTROL UNIT AND STEERING
ANGLE SENSOR
1.
Turn ignition switch “OFF”.
2.
Disconnect active damper suspension control unit harness connector and the steering angle sensor har-
ness connector.
3.
Check continuity between the following terminals.
–
Active damper suspension control unit harness connector (A)
B37 terminal 1 and steering angle sensor harness connector (B)
M52 terminal 6.
–
Active damper suspension control unit harness connector (A)
B37 terminal 2 and steering angle sensor harness connector (B)
M52 terminal 7.
–
Active damper suspension control unit harness connector (A)
B37 terminal 20 and steering angle sensor harness connector
(B) M52 terminal 8.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4
NG
>> Repair or replace damaged parts.
4.
CHECK STEERING ANGLE SENSOR
Check steering angle sensor. Refer to
BRC-40, "Steering Angle Sensor"
.
OK or NG
OK
>> GO TO 5.
NG
>> Replace steering angle sensor. Refer to
5.
CHECK ACTIVE DAMPER SUSPENSION CONTROL UNIT
Check active damper suspension control unit input/output signal. Refer to
SCS-20, "Active Damper Suspen-
sion Control Unit Input/Output Signal Reference Values"
OK or NG
OK
>> GO TO 6.
NG
>> Check active damper suspension control unit pin terminals for damage or loose connection with
harness connector. If any items are damaged, repair or replace damaged parts.
6.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK
>> INSPECTION END
NG
>> Replace active damper suspension control unit. Refer to
SCS-60, "Removal and Installation"
Continuity should exist.
SEIA0707E
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