Infiniti Q45. Manual - part 804

 

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Infiniti Q45. Manual - part 804

 

 

TROUBLE DIAGNOSIS FOR SYSTEM

SCS-33

C

D

F

G

H

I

J

K

L

M

A

B

SCS

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 

DI-16, "Trouble Diagnosis"

 .

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

C

D

F

G

H

I

J

K

L

M

A

B

SCS

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 

BRC-70, "REMOVAL"

 .

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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