Infiniti Q45. Manual — part 807

TROUBLE DIAGNOSIS FOR SYSTEM

SCS-45

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D

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G

H

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K

L

M

A

B

SCS

6.

CHECK HARNESS BETWEEN ACTIVE DAMPER SUSPENSION CONTROL UNIT AND REAR SHOCK

ABSORBER ACTUATOR LH

1.

Turn ignition switch “OFF”.

2.

Disconnect active damper suspension control unit harness connector and the rear shock absorber actua-
tor LH harness connector.

3.

Check continuity between the following terminals.

–

Active damper suspension control unit harness connector (A)
B38 terminal 28 and rear shock absorber actuator LH harness
connector (B) B26 terminal 2.

–

Active damper suspension control unit harness connector (A)
B38 terminal 29 and rear shock absorber actuator LH harness
connector (B) B26 terminal 3.

–

Active damper suspension control unit harness connector (A)
B38 terminal 30 and rear shock absorber actuator LH harness
connector (B) B26 terminal 4.

–

Active damper suspension control unit harness connector (A)
B38 terminal 37 and rear shock absorber actuator LH harness connector (B) B26 terminal 1.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace damaged parts.

7.

CHECK HARNESS BETWEEN ACTIVE DAMPER SUSPENSION CONTROL UNIT AND REAR SHOCK

ABSORBER ACTUATOR RH

1.

Turn ignition switch “OFF”.

2.

Disconnect active damper suspension control unit harness connector and the rear shock absorber actua-
tor RH harness connector.

3.

Check continuity between the following terminals.

–

Active damper suspension control unit harness connector (A)
B38 terminal 27 and rear shock absorber actuator RH harness
connector (B) B226 terminal 3.

–

Active damper suspension control unit harness connector (A)
B38 terminal 35 and rear shock absorber actuator RH harness
connector (B) B226 terminal 1.

–

Active damper suspension control unit harness connector (A)
B38 terminal 36 and rear shock absorber actuator RH harness
connector (B) B226 terminal 4.

–

Active damper suspension control unit harness connector (A)
B38 terminal 45 and rear shock absorber actuator RH harness connector (B) B226 terminal 2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8 (with CONSULT-II).
>> GO TO 9 (without CONSULT-II).

NG

>> Repair or replace damaged parts.

Continuity should exist.

SEIA0720E

Continuity should exist.

SEIA0721E

SCS-46

TROUBLE DIAGNOSIS FOR SYSTEM

8.

CHECK SHOCK ABSORBER ACTUATOR (WITH CONSULT-II)

Use the “ACTIVE TEST” of CONSULT-II to check the shock absorber actuator. Refer to

SCS-26, "Shock

Absorber Actuator"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace shock absorber actuator.

9.

CHECK SHOCK ABSORBER ACTUATOR (WITHOUT CONSULT-II)

1.

Turn ignition switch “OFF”.

2.

Remove the each shock absorber actuator harness connector.

3.

Check resistance between front shock absorber actuator con-
nector (A) terminals 1, 2, 3, 4 and 5.

4.

Check resistance between rear shock absorber actuator con-
nector (A) terminals 1, 2, 3, 4 and 5.

OK or NG

OK

>> GO TO 10.

NG

>> Replace shock absorber actuator.

10.

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 10.

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.

11.

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"

.

1 - 5

: Approx. 12

Ω

2 - 5

: Approx. 12

Ω

3 - 5

: Approx. 12

Ω

4 - 5

: Approx. 12

Ω

SEIA0726E

1 - 5

: Approx. 12

Ω

2 - 5

: Approx. 12

Ω

3 - 5

: Approx. 12

Ω

4 - 5

: Approx. 12

Ω

SEIA0736E

TROUBLE DIAGNOSIS FOR SYSTEM

SCS-47

C

D

F

G

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SCS

Engine Speed Signal

NES000CE

●

Check the following if “flickering pattern for 31” 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.

DIAGNOSTIC PROCEDURE

1.

CHECK DTC WITH ECM

Perform self-diagnosis with ECM. Refer to

EC-118, "SELF-DIAG RESULTS MODE"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

Monitored item

Content

Condition

Display value

ENGINE SPEED [rpm]

Engine speed

Engine stopped

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately
equal to the indica-
tion on tachometer

Terminal

Wire

color

Item

Condition

Data (Approx.)

12

W/G

Engine speed

Engine speed: At idle
(Warm-up condition)

Engine speed: Approx. 2,000 rpm
(Warm-up condition)

PBIA3654J

PBIA3655J

SCS-48

TROUBLE DIAGNOSIS FOR SYSTEM

2.

CHECK ENGINE SPEED 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 “ENGINE SPEED”.

Without CONSULT-II

1.

Start engine.

2.

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

Also check harness for short to ground and short to power.

OK or NG

YES

>> GO TO 4.

NO

>> GO TO 3.

Condition

Display value

Engine stopped

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately
equal to the indica-
tion on tachometer

SEIA0779E

Connector

Terminal

Condition

Data (Approx.)

B37

12 -

Ground

Engine speed: At idle
(Warm-up condition)

Engine speed:
Approx. 2,000 rpm
(Warm-up condition)

SEIA0780E

PBIA3654J

PBIA3655J