Infiniti Q45. Manual — part 879

TROUBLE DIAGNOSIS FOR SYSTEM

STC-19

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

Vehicle Speed Sensor (VEHICLE SPEED SEN)

NGS00066

●

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)

CAUTION:

Check air pressure of tire under standard
condition.

SEIA0775E

STC-20

[WITHOUT REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYSTEM

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
terminal (A) 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 indication on
speedometer (Inside
of

±

10%)

SGIA1404E

Connector

Terminal

Condition

Data (Approx.)

B37

22 -

Ground

Vehicle speed:
40 km/h (25 MPH)

CAUTION:

Check air pres-
sure of tire under
standard condi-
tion.

SGIA1407E

SEIA0775E

Connector

Terminal

Condition

Data (Approx.)

M41

18 -

Ground

Vehicle speed:
40 km/h (25 MPH)

CAUTION:

Check air pres-
sure of tire under
standard condi-
tion.

SGIA1408E

SEIA0775E

TROUBLE DIAGNOSIS FOR SYSTEM

STC-21

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

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

STC-12, "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

STC-30, "Removal and Installation"

.

Power Steering Solenoid Valve

NGS00069

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 circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminal.

Continuity should exist.

SGIA1409E

Monitored item

Content

Condition

Display value

POWER STR SOL [A]

Monitored value of current at
power steering solenoid valve

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

Approx. 1.10 A

Vehicle speed: 100 km/h (62 MPH)

Approx. 0.54 A

Terminal

Wire

color

Item

Condition

Data (Approx.)

21

OR/L

Power steering solenoid valve

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

4.4 - 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 - 3.6 V

STC-22

[WITHOUT REAR ACTIVE STEER]

TROUBLE DIAGNOSIS FOR SYSTEM

DIAGNOSTIC PROCEDURE

1.

CHECK POWER STEERING SOLENOID VALVE SIGNAL

With CONSULT-II

1.

Start engine.

2.

Select “DATA MONITOR” mode for “ACT D/SUS” with CONSULT-II.

3.

Read out the value of “POWER STR SOL”.

Without CONSULT-II

1.

Start engine.

2.

Check signal between active damper suspension control unit
harness connector (A) terminal and ground.

OK or NG

OK >> GO

TO

5.

NG

>> GO TO 2.

2.

CHECK POWER STEERING SOLENOID VALVE GROUND CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect power steering solenoid valve harness connector.

3.

Check continuity between power steering solenoid valve har-
ness connector (A) F3 terminal 2 and ground.

Also check harness for short to power.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

Condition

Display value

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

Approx. 1.10 A

Vehicle speed: 100 km/h (62 MPH)

Approx. 0.54 A

SGIA1405E

Connector

Terminal

Condition

Data

(Approx.)

B37

21 -

Ground

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

4.4 - 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 - 3.6 V

SGIA1410E

Continuity should exist.

SGIA1411E