Infiniti QX56 (JA60). Manual — part 815

EXHAUST VALVE SOLENOID CIRCUIT

SCS-25

< COMPONENT DIAGNOSIS >

C

D

F

G

H

I

J

K

L

M

A

B

SCS

N

O

P

1. Turn ignition switch OFF.

2. Disconnect suspension control unit connector B3 and suspen-

sion air compressor connector C9.

3. Check continuity between suspension control unit connector B3

(A) terminal 9 and suspension air compressor connector C9 (B)

terminal 2.

4. Check continuity between suspension control unit connector B3

(A) terminal 9 and ground.

Are the continuity test results as specified?

YES

>> Replace the suspension control unit. Refer to

RSU-26, "Removal and Installation"

.

NO

>> Repair harness or connector.

3.

CHECK SUSPENSION AIR COMPRESSOR GROUND

1. Turn ignition switch OFF.

2. Check continuity between suspension air compressor connector

C9 terminals 1 and 3 and ground.

Is continuity present?

YES

>> Replace the suspension air compressor. Refer to

RSU-

24, "Removal and Installation"

.

NO

>> Repair harness or connector.

A

B

Continuity

Connector

Terminal

Connector

Terminal

B3

9

C9

2

Yes

A

—

Continuity

Connector

Terminal

B3

9

Ground

No

ALEIA0037GB

Connector

Terminal

—

Continuity

C9

1

Ground

Yes

3

ALEIA0038GB

SCS-26

< COMPONENT DIAGNOSIS >

CK SUSP WARNING INDICATOR CONTROL CIRCUIT

CK SUSP WARNING INDICATOR CONTROL CIRCUIT

Description

INFOID:0000000005148187

The CK SUSP warning lamp is controlled by a ground signal provided to the combination meter by the sus-

pension control unit.

Component Function Check

INFOID:0000000005148188

1.

CHECK WARNING LAMP OPERATION

CONSULT-III

1. Turn ignition ON.

2. Select "WARNING LAMP" of AIR LEVELIZER active test items.

3. While operating test item, check that the warning lamp activates.

Does the warning lamp operate properly?

YES

>> Warning lamp is operating normally.

NO

>> Refer to

SCS-26, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005148189

Regarding Wiring Diagram information, refer to

SCS-29, "Wiring Diagram"

.

1.

PERFORM SUSPENSION CONTROL SYSTEM SELF-DIAGNOSIS

CONSULT-III

1. Turn ignition ON.

2. Perform SELF DIAGNOSIS function of AIR LEVELIZER system.
Are any DTC's present?

YES

>> Refer to

SCS-34, "DTC Index"

.

NO

>> • If warning lamp is always ON, GO TO 2.

• If warning lamp is always OFF, GO TO 3

2.

CHECK SUSPENSION CONTROL UNIT WARNING LAMP CONTROL

1. Turn ignition OFF.

2. Disconnect the suspension control unit connector B3.

3. Turn ignition ON.
Does the CK SUSP warning lamp turn ON?

YES

>> GO TO 3.

NO

>> Replace the suspension control unit. Refer to

RSU-26, "Removal and Installation"

.

3.

CHECK CONTINUITY OF WARNING LAMP CONTROL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect suspension control unit connector B3 and combina-

tion meter connector M24.

3. Check continuity between suspension control unit connector B3

(A) terminal 10 and combination meter connector M24 (B) termi-

nal 15.

ON

: Warning lamp turns ON

OFF

: Warning lamp turns OFF

A

B

Continuity

Connector

Terminal

Connector

Terminal

B3

10

M24

15

Yes

ALLIA0693GB

CK SUSP WARNING INDICATOR CONTROL CIRCUIT

SCS-27

< COMPONENT DIAGNOSIS >

C

D

F

G

H

I

J

K

L

M

A

B

SCS

N

O

P

4. Check continuity between suspension control unit connector B3 (A) terminal 10 and ground.

Are the continuity test results as specified?

YES

>> Replace the combination meter. Refer to

MWI-100, "Removal and Installation"

.

NO

>> Repair harness or connector.

A

—

Continuity

Connector

Terminal

B3

10

Ground

No

SCS-28

< ECU DIAGNOSIS >

SUSPENSION CONTROL UNIT

ECU DIAGNOSIS

SUSPENSION CONTROL UNIT

Reference Value

INFOID:0000000005148190

TERMINAL LAYOUT

PHYSICAL VALUES

AWLIA1640ZZ

Terminal

(Wire color)

Description

Condition

Reference value

(Approx.)

+

–

Signal name

Input/

Output

1

(V)

Ground Compressor relay output

Output

Ignition

switch

ON

Air levelizer raising vehicle
ride height

Battery voltage

3

(W)

Ground Height sensor input

Input

Ignition

switch

ON

—

0.2V - 4.8V

5

(R)

Ground

VREF output (height sen-
sor)

Output

Ignition

switch

ON

—

5V

6

(G/R)

Ground IGN power supply

Input

Ignition

switch

ON or

START

—

Battery voltage

7

(W/L)

Ground BAT power supply

Input

Ignition

switch

OFF

—

Battery voltage

8

(G/W)

Ground

Diagnostic K-line

Input/

Output

—

—

—

9

(SB)

Ground Exhaust valve output

Output

Ignition

switch

ON

Air levelizer lowering vehi-
cle ride height (venting)

Battery voltage

10

(BR)

Ground Warning lamp output

Output

Ignition

switch

ON

Warning lamp ON

0V

Warning lamp OFF

Battery voltage

14

(L)

Ground

Height sensor ground

Output

Ignition

switch

ON

—

Less than 0.2V

15

(BR/W)

Ground Generator input

Input

Ignition

switch

ON

Charge light ON

0V

Charge light OFF

Battery voltage

16

(B)

Ground

Suspension control unit
ground

Input

Ignition

switch

ON

—

Less than 0.2V