Infiniti Q45. Manual - part 878

 

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Infiniti Q45. Manual - part 878

 

 

TROUBLE DIAGNOSIS

STC-15

[WITHOUT REAR ACTIVE STEER]

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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 

SCS-24,

"SELF-DIAG RESULT MODE"

 .

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.

STC-24, "Engine 
Speed Signal"

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 

PS-6, "POWER

STEERING FLUID"

 .

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

STC-28

Power steering solenoid valve

Light steering when driving at a high speed.

While high speed driving

Vehicle speed sensor

STC-29

Power steering solenoid valve

TROUBLE DIAGNOSIS FOR SYSTEM

STC-17

[WITHOUT REAR ACTIVE STEER]

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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 

PG-2, "POWER SUPPLY

ROUTING"

 .

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 

PG-2, "POWER SUPPLY ROUTING"

 .

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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