Infiniti Q45. Manual — part 809

TROUBLE DIAGNOSIS FOR SYSTEM

SCS-53

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SCS

2.

CHECK HARNESS BETWEEN ACTIVE DAMPER SUSPENSION CONTROL UNIT AND STOP LAMP

SWITCH

1.

Turn ignition switch “OFF”.

2.

Disconnect active damper suspension control unit harness connector and stop lamp switch harness con-
nector.

3.

Check continuity between active damper suspension control unit
harness connector (A) B37 terminal 11 and stop lamp switch
harness connector (B) M402 terminal 4.

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

OK or NG

OK

>> GO TO 3.

NG

>> Check the following. If any items are damaged, repair or

replace damaged parts.

●

Harness for short or open between active damper
suspension control unit harness connector B37 termi-
nal 11 and stop lamp switch harness connector M402 terminal 4.

●

Harness for short or open between active damper suspension control unit harness connector
B37 terminal 11 and ICC brake hold relay harness connector E37 terminal 7 (ICC models).

3.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect stop lamp switch harness connector.

3.

Check voltage between stop lamp switch harness connector (A)
terminal and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Check the following. If any items are damaged, repair or

replace damaged parts.

●

10A fuses [No. 17 located in the fuse block (J/B)
NO.1]. Refer to

PG-2, "POWER SUPPLY ROUTING"

.

●

Harness for short or open between battery and stop lamp switch harness connector M402 ter-
minal 3.

●

Harness for short or open between battery and ICC brake relay harness connector E38 termi-
nal 6. (ICC models)

●

Play and clearance between brake pedal and floor panel with pedal. Refer to

BR-6, "PLAY AND

CLEARANCE BETWEEN BRAKE PEDAL AND FLOOR PANEL WITH PEDAL DEPRESSED"

.

●

Stop lamp switch

●

ICC brake hold relay (ICC models)

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.

Continuity should exist.

SEIA0777E

Connector

Terminal

Condition

Voltage

(Approx.)

M402

3 - Ground

Ignition switch: ON

Battery voltage

SEIA0778E

SCS-54

TROUBLE DIAGNOSIS FOR SYSTEM

5.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while. Refer to

SCS-24, "SELF-DIAG RESULT MODE"

.

OK or NG

OK

>> INSPECTION END

NG

>> Replace active damper suspension control unit. Refer to

SCS-60, "Removal and Installation"

.

Component Inspection

NES000HH

VERTICAL G SENSOR

1.

Turn ignition switch “OFF”.

2.

Disconnect front vertical G sensor harness connector and rear vertical G sensor harness connector.

3.

Remove front vertical G sensor and rear vertical G sensor. Refer to

SCS-61, "Removal and Installation"

.

4.

Apply 5 V (B) direct current between each vertical G sensor con-
nector (A) terminals 1 (positive) and 3 (negative).

5.

Check voltage between each vertical G sensor connector (A)
terminals 2 and 3.

6.

If NG, replace vertical G sensor.

SHOCK ABSORBER ACTUATOR

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.

5.

If NG, replace shock absorber actuator.

Terminal

Condition

Voltage (Approx.)

2 (positive) -

3 (negative)

Vertical G sensor stop condition

2.5 V

Vertical G sensor lift up/down condition

Repeats 0 - 5 V

SEIA0712E

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

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ACTIVE DAMPER SUSPENSION SELECT SWITCH

1.

Turn ignition switch “OFF”.

2.

Remove the active damper suspension select switch.

3.

Operate active damper suspension select switch (A) and check
continuity between active damper suspension select switch (A)
terminal.

4.

If NG, replace active damper suspension select switch.

Terminal

Condition

Continuity

1 - 2

Active damper suspension select switch: AUTO

Yes

Active damper suspension select switch: SPORT

No

SEIA0725E

SCS-56

TROUBLE DIAGNOSIS FOR SYMPTOMS

TROUBLE DIAGNOSIS FOR SYMPTOMS

PFP:00007

Hard or Soft Feel

NES000CH

SYMPTOM:

At starting or cornering

DIAGNOSTIC PROCEDURE

1.

CHECK SELF-DIAGNOSTIC RESULTS

1.

Disconnect active damper suspension control unit connector and each shock absorber actuator connec-
tor, then re-connect them.

2.

Perform self-diagnosis to check that proper test results are obtained.

OK or NG

OK

>> GO TO 2.

NG

>> Check and repair detected area.

2.

CHECK SHOCK ABSORBER ACTUATOR OPERATION

1.

Set the diagnostic system in the self-diagnosis mode.

2.

Depress parking brake pedal.

3.

Set select switch to “AUTO”, then move vehicle body up and down to check that dampening force of each
shock absorber is high. Brake pedal should be released during tests.

4.

Set select lever to “SPORT”, then move vehicle body up and down to check that dampening force of each
shock absorber is high.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 3.

3.

CHECK SYSTEM FOR SHOCK ABSORBER ACTUATOR

Perform trouble diagnosis for shock Absorber Actuator system. Refer to

SCS-41, "Shock Absorber Actuator"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4.

CHECK SYSTEM FOR ACTIVE DAMPER SUSPENSION SELECT SWITCH

Perform trouble diagnosis for active damper suspension select switch system. Refer to

SCS-49, "Active

Damper Suspension Select Switch"

.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.