Infiniti QX56 (JA60). Manual — part 814
COMPRESSOR MOTOR RELAY
SCS-21
< COMPONENT DIAGNOSIS >
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B
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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.
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 COMPRESSOR MOTOR RELAY GROUND
1. Turn ignition switch OFF.
2. Check continuity between compressor motor relay connector
E130 terminal 1 and ground.
Is continuity present?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK COMPRESSOR MOTOR RELAY POWER SUPPLY
1. Disconnect compressor motor relay connector E131.
2. Check voltage between compressor motor relay E131 terminal 5
and ground.
Is battery voltage present?
YES
>> GO TO 5.
NO
>> Inspect fuse and repair harness or connector.
5.
CHECK COMPRESSOR MOTOR RELAY OUTPUT
A
B
Continuity
Connector
Terminal
Connector
Terminal
B3
1
E130
2
Yes
A
—
Continuity
Connector
Terminal
B3
1
Ground
No
ALEIA0031GB
Connector
Terminal
—
Continuity
E130
1
Ground
Yes
ALEIA0032GB
(+)
(-)
Voltage
Connector
Terminal
E131
5
Ground
Battery voltage
ALEIA0033GB
SCS-22
< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
1. Connect compressor motor relay connectors E130 and E131.
2. Disconnect suspension air compressor connector C9.
3. Turn ignition ON.
4. Select "COMPRESSOR" of AIR LEVELIZER active test items.
5. Check voltage between compressor motor relay C9 terminal 4
and ground.
Is battery voltage present?
YES
>> Compressor motor relay is functioning properly.
NO
>> GO TO 6.
6.
CHECK AIR COMPRESSOR POWER SUPPLY CIRCUIT
Check the air compressor power supply circuit. Refer to
SCS-17, "SUSPENSION AIR COMPRESSOR : Diag-
.
Does the power supply circuit test OK?
YES
>> Replace the compessor motor relay.
NO
>> Repair harness or connector.
(+)
(-)
Voltage
Connector
Terminal
C9
4
Ground
Battery voltage
ALEIA0034GB
HEIGHT SENSOR SIGNAL CIRCUIT
SCS-23
< COMPONENT DIAGNOSIS >
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HEIGHT SENSOR SIGNAL CIRCUIT
Description
INFOID:0000000005148181
Supplies vehicle height input to the suspension control unit.
Component Function Check
INFOID:0000000005148182
1.
CHECK HEIGHT SENSOR OPERATION
CONSULT-III
1. Select "HEIGT SEN" of AIR LEVELIZER data monitor test item.
2. While monitoring test item, add or take away weight from the rear of the vehicle. Check that the voltage
value changes with vehicle height.
Is the HEIGHT SEN data monitor responding normally?
YES
>> Height sensor is operating normally.
NO
>> Refer to
Diagnosis Procedure
INFOID:0000000005148183
Regarding Wiring Diagram information, refer to
.
1.
CHECK HEIGHT SENSOR POWER AND GROUND SUPPLY
Check height sensor power and ground supply. Refer to
SCS-18, "HEIGHT SENSOR : Diagnosis Procedure"
.
Are the inspection results normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK HEIGHT SENSOR SIGNAL CIRCUIT
1. Disconnect suspension control unit connector B3 and height
sensor connector C8.
2. Check continuity between suspension control unit connector B3
(A) terminal 3 and height sensor connector C8 (B) terminal 2.
3. Check continuity between display unit harness connector B3 (A)
terminal 3 and ground.
Are the continuity results as specified?
YES
>> Replace the height sensor. Refer to
RSU-27, "Removal and Installation"
.
NO
>> Repair harness or connector.
HEIGHT SEN
: Voltage changes with vehicle height
A
B
Continuity
Connector
Terminal
Connector
Terminal
B3
3
C8
2
Yes
A
—
Continuity
Connector
Terminal
B3
3
Ground
No
ALEIA0035GB
SCS-24
< COMPONENT DIAGNOSIS >
EXHAUST VALVE SOLENOID CIRCUIT
EXHAUST VALVE SOLENOID CIRCUIT
Description
INFOID:0000000005148184
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 Check
INFOID:0000000005148185
1.
CHECK EXHAUST SOLENOID OPERATION
CAUTION:
While operating this active test, the suspension control system will vent air pressure and the vehicle
ride height will lower. Ensure the 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 valve 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
.
Diagnosis Procedure
INFOID:0000000005148186
Regarding Wiring Diagram information, refer to
.
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 EXHAUST VALVE SOLENOID CIRCUIT
ON
: Air vents and vehicle ride height lowers
OFF
: No air vents and vehicle ride height remains constant
(+)
(-)
Voltage
Connector
Terminal
C9
2
Ground
Battery voltage
ALEIA0036GB
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