Infiniti QX56 (JA60). Manual — part 809

SCS-1

SUSPENSION

C

D

F

G

H

I

J

K

L

M

SECTION

SCS

A

B

SCS

N

O

P

CONTENTS

SUSPENSION CONTROL SYSTEM

BASIC INSPECTION . . . . . . . . .

3

DIAGNOSIS AND REPAIR WORKFLOW . . ..

3

Work Flow . . . . . . . . . . . . . . . .....

3

FUNCTION DIAGNOSIS . . . . . . . ...

5

SUSPENSION CONTROL SYSTEM . . . . ...

5

System Diagram . . . . . . . . . . . . . ....

5

System Description . . . . . . . . . . . . ...

5

Component Parts Location . . . . . . . . . ....

6

Component Description . . . . . . . . . . .....

6

DIAGNOSIS SYSTEM (SUSPENSION CON-
TROL UNIT) . . . . . . . . . . . . . . .

7

CONSULT-III Function . . . . . . . . . . . ..

7

COMPONENT DIAGNOSIS . . . . . . ..

9

C1801 VEHICLE HEIGHT SENSOR . . . . ...

9

Description . . . . . . . . . . . . . . . ....

9

DTC Logic . . . . . . . . . . . . . . . .....

9

Diagnosis Procedure . . . . . . . . . . . ....

9

C1802 COMPRESSOR RELAY . . . . . . .

10

Description . . . . . . . . . . . . . . . ..

10

DTC Logic . . . . . . . . . . . . . . . ...

10

Diagnosis Procedure . . . . . . . . . . . ..

10

C1803 EXHAUST SOLENOID . . . . . . ...

11

Description . . . . . . . . . . . . . . . ..

11

DTC Logic . . . . . . . . . . . . . . . ...

11

Diagnosis Procedure . . . . . . . . . . . ..

11

C1804 HEIGHT ADJUSTING MALFUNCTION
(COMPRESSOR) . . . . . . . . . . . .

12

Description . . . . . . . . . . . . . . . ..

12

DTC Logic . . . . . . . . . . . . . . . ...

12

Diagnosis Procedure . . . . . . . . . . . ..

12

C1805 HEIGHT ADJUSTING MALFUNCTION
(EXH SOLENOID) . . . . . . . . . . . ..

13

Description . . . . . . . . . . . . . . . ...

13

DTC Logic . . . . . . . . . . . . . . . .

13

Diagnosis Procedure . . . . . . . . . . . ..

13

C1806 VEHICLE HEIGHT SENSOR LOCK-
ING MALFUNCTION . . . . . . . . . . .

14

Description . . . . . . . . . . . . . . . ...

14

DTC Logic . . . . . . . . . . . . . . . .

14

Diagnosis Procedure . . . . . . . . . . . ...

14

C1807 SENSOR 5V MALFUNCTION . . . ...

15

Description . . . . . . . . . . . . . . . ...

15

DTC Logic . . . . . . . . . . . . . . . .

15

Diagnosis Procedure . . . . . . . . . . . ..

15

C1808 INTEGRAL TIME MALFUNCTION
SUPPLYING AIR . . . . . . . . . . . ...

16

Description . . . . . . . . . . . . . . . ...

16

DTC Logic . . . . . . . . . . . . . . . .

16

Diagnosis Procedure . . . . . . . . . . . ..

16

POWER SUPPLY AND GROUND CIRCUIT .

17

SUSPENSION CONTROL UNIT . . . . . . . .

17

SUSPENSION CONTROL UNIT : Diagnosis Pro-
cedure . . . . . . . . . . . . . . . . . ..

17

SUSPENSION AIR COMPRESSOR . . . . . . ..

17

SUSPENSION AIR COMPRESSOR : Diagnosis
Procedure . . . . . . . . . . . . . . . .

17

HEIGHT SENSOR . . . . . . . . . . . . . ..

18

HEIGHT SENSOR : Diagnosis Procedure . . . ..

18

COMPRESSOR MOTOR RELAY . . . . . .

20

Description . . . . . . . . . . . . . . . ...

20

Component Function Check . . . . . . . . .

20

Diagnosis Procedure . . . . . . . . . . . ...

20

HEIGHT SENSOR SIGNAL CIRCUIT . . . ...

23

Description . . . . . . . . . . . . . . . ...

23

Component Function Check . . . . . . . . .

23

Diagnosis Procedure . . . . . . . . . . . ...

23

SCS-2

EXHAUST VALVE SOLENOID CIRCUIT . . ..

24

Description . . . . . . . . . . . . . . . ..

24

Component Function Check . . . . . . . . ...

24

Diagnosis Procedure . . . . . . . . . . . ..

24

CK SUSP WARNING INDICATOR CONTROL
CIRCUIT . . . . . . . . . . . . . . . .

26

Description . . . . . . . . . . . . . . . ..

26

Component Function Check . . . . . . . . ...

26

Diagnosis Procedure . . . . . . . . . . . ..

26

ECU DIAGNOSIS . . . . . . . . . .

28

SUSPENSION CONTROL UNIT . . . . . .

28

Reference Value . . . . . . . . . . . . . .

28

Wiring Diagram . . . . . . . . . . . . . ...

29

DTC Index . . . . . . . . . . . . . . . ..

34

SYMPTOM DIAGNOSIS . . . . . . . .

36

SUSPENSION CONTROL SYSTEM . . . . .

36

Symptom Table . . . . . . . . . . . . . ..

36

SUSPENSION CONTROL SYSTEM INOPER-
ATIVE . . . . . . . . . . . . . . . . .

37

Description . . . . . . . . . . . . . . . ..

37

Diagnosis Procedure . . . . . . . . . . . ...

37

SUSPENSION CONTROL SYSTEM DOES
NOT RAISE . . . . . . . . . . . . . .

38

Description . . . . . . . . . . . . . . . ..

38

Diagnosis Procedure . . . . . . . . . . . ...

38

SUSPENSION CONTROL SYSTEM DOES
NOT LOWER . . . . . . . . . . . . . .

39

Description . . . . . . . . . . . . . . . ..

39

Diagnosis Procedure . . . . . . . . . . . ...

39

PRECAUTION . . . . . . . . . . .

40

PRECAUTIONS . . . . . . . . . . . . .

40

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . . .

40

Precaution for Rear Suspension . . . . . . . .

40

DIAGNOSIS AND REPAIR WORKFLOW

SCS-3

< BASIC INSPECTION >

C

D

F

G

H

I

J

K

L

M

A

B

SCS

N

O

P

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000005148145

OVERALL SEQUENCE

DETAILED FLOW

ALEIA0041GB

SCS-4

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

1.

INTERVIEW FOR MALFUNCTION

Interview the customer about the symptom.

>> GO TO 2.

2.

SYMPTOM CHECK

Verify the symptom from the customer's information.

>> GO TO 3.

3.

BASIC INSPECTION

Check the operation of each part. Check that no symptoms occur other than those specified by the customer.

>> GO TO 4.

4.

SELF-DIAGNOSIS WITH CONSULT-III

Perform the self diagnosis with CONSULT-III. Check that any DTC is detected.
Is any DTC detected?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

TROUBLE DIAGNOSIS BY DTC

Perform the trouble diagnosis for the detected DTC. Specify the malfunctioning part.

>> GO TO 7.

6.

SYMPTOM DIAGNOSIS

Perform the symptom diagnosis. Specify the malfunctioning part.

>> GO TO 7.

7.

MALFUNCTIONING PART REPAIR

Repair or replace the malfunctioning part.

>> GO TO 8.

8.

REPAIR CHECK (SELF-DIAGNOSIS WITH CONSULT-III)

Perform the self diagnosis with CONSULT-III. Verfied that no DTCs are detected. Erase all DTCs detected

prior to the repair. Verify that DTC is not detected again.
Is any DTC detected?

YES

>> GO TO 5.

NO

>> GO TO 9.

9.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.
Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 3.