2009 INFINITI QX56 Factory Service Manual

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Page 3209 of 4171

INFINITI QX56 2009 Factory Service Manual SCS-16
< COMPONENT DIAGNOSIS >
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
DescriptionINFOID:0000000003772333
The suspension air compressor is supplied

Page 3210 of 4171

INFINITI QX56 2009 Factory Service Manual POWER SUPPLY AND GROUND CIRCUITSCS-17
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
SCS
N
O P
POWER SUPPLY AND GROUND CIRCUIT
SUSPENSION CONTROL UNIT
SUSPENSION CONTROL UNIT : Diagnosis ProcedureINF

Page 3211 of 4171

INFINITI QX56 2009 Factory Service Manual SCS-18
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1. Disconnect the suspension air compressor connector C9.
2. Turn ignition switch ON.
3. Select "COMPRESSOR" under AIR LEVELIZER active t

Page 3212 of 4171

INFINITI QX56 2009 Factory Service Manual POWER SUPPLY AND GROUND CIRCUITSCS-19
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
SCS
N
O P
1. Disconnect height sensor connector C8.
2. Turn the ignition switch ON.
3. Check voltage between the h

Page 3213 of 4171

INFINITI QX56 2009 Factory Service Manual SCS-20
< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
COMPRESSOR MOTOR RELAY
DescriptionINFOID:0000000003772339
Receives suspension air compressor ON signal from suspension control unit. When activate

SCS-20
< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
COMPRESSOR MOTOR RELAY
DescriptionINFOID:0000000003772339
Receives suspension air compressor ON signal from suspension control unit. When activated, the compressor
motor relay supplies power to the suspension air compressor.
Component Function CheckINFOID:0000000003772340
1.CHECK COMPRESSOR MOTOR RELAY OPERATION
CAUTION:
The "COMPRESSOR" active test will remain ON until it is turned off using CONSULT-III. Allowing the
compressor to run for an extended period of time may cause damage to the suspension control sys-
tem components due to excessive air pressure.
CONSULT-III
1. Turn ignition ON.
2. Select "COMPRESSOR" of AIR LEVELIZER active test items.
3. While operating test item, check that the suspension air compressor turns ON.
Does the suspension air compressor operate properly?
YES >> Compressor motor relay and suspension air compressor are operating normally.
NO >> Refer to SCS-20, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772341
1.CHECK COMPRESSOR "ON" SIGNAL FROM SUSPENSION CONTROL UNIT
CONSULT-III
1. Turn ignition switch ON.
2. Disconnect compressor motor relay connector E130.
3. Select "COMPRESSOR" of AIR LEVELIZER active test items.
4. While operating test item, check voltage to compressor motor relay connector E130 terminal 2.
Is battery voltage present while operating test item?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK COMPRESSOR "ON" SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect suspension control unit connector B3.
3. Check continuity between suspension control unit connector B3 (A) terminal 1 and compressor motor relay connector E130 (B)
terminal 2.
4. Check continuity between suspension control unit connector B3 (A) terminal 1 and ground.ON : Compressor turns ON
OFF : Compressor turns OFF
(+)
(-)Voltage
Connector Terminal
E130 2Ground Battery voltage
ALEIA0030GB
AB
Continuity
Connector Terminal Connector Terminal
B3 1E 1302 Y es
ALEIA0031GB
Revision: December 20092009 QX56

Page 3214 of 4171

INFINITI QX56 2009 Factory Service Manual COMPRESSOR MOTOR RELAYSCS-21
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
SCS
N
O P
Are the continuity test results as specified?
YES >> Replace the suspension control unit. Refer to RSU-26, "Remov

Page 3215 of 4171

INFINITI QX56 2009 Factory Service Manual SCS-22
< COMPONENT DIAGNOSIS >
HEIGHT SENSOR SIGNAL CIRCUIT
HEIGHT SENSOR SIGNAL CIRCUIT
DescriptionINFOID:0000000003772342
Supplies vehicle height input to the suspension control unit.
Component Func

Page 3216 of 4171

INFINITI QX56 2009 Factory Service Manual EXHAUST VALVE SOLENOID CIRCUITSCS-23
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
SCS
N
O P
EXHAUST VALVE SOLENOID CIRCUIT
DescriptionINFOID:0000000003772345
Receives exhaust valve solenoid signal f

EXHAUST VALVE SOLENOID CIRCUITSCS-23
< COMPONENT DIAGNOSIS >
C
DF
G H
I
J
K L
M A
B
SCS
N
O P
EXHAUST VALVE SOLENOID CIRCUIT
DescriptionINFOID:0000000003772345
Receives exhaust valve solenoid signal from suspension control unit. When activated, the exhaust valve sole-
noid releases air pressure from the suspension control system.
Component Function CheckINFOID:0000000003772346
1.CHECK EXHAUST SOLENOID OPERATION
CAUTION:
While operating this active test, the suspension control system wil l vent air pressure and the vehicle
ride height will lower. Ensure th e area around the vehicle is free from obstructions before beginning
test.
CONSULT-III
1. Ensure the suspension control system has air pressure and is not drooping in the rear.
2. Select "EXHAUST SOLENOID" of AIR LEVELIZER active test items.
3. While operating test item, check that the exhaust va lve solenoid opens to vent air from the system. The
vehicle should lower when the exhaust valve solenoid is activated.
Does the system vent properly?
YES >> Exhaust valve solenoid is operating normally.
NO >> Refer to SCS-23, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772347
1.CHECK EXHAUST VALVE SOLENOID SIGNAL
CONSULT-III
1. Connect suspension control unit connector B3.
2. Turn ignition switch ON.
3. Select "EXHAUST SOLENOID" of AIR LEVELIZER active test
items.
4. While test item is operating, check signal between suspension
air compressor connector C9 terminal 2 and ground.
Is battery voltage present?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK CONTINUITY OF EXHAU ST VALVE SOLENOID CIRCUIT
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.ON : Air vents and vehicle ride height lowers
OFF : No air vents and vehicle ride height remains constant
(+)
(-)Voltage
Connector Terminal
C9 2Ground Battery voltage
ALEIA0036GB
AB
Continuity
Connector Terminal Connector Terminal
B39C 92 Y es
ALEIA0037GB
Revision: December 20092009 QX56

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