Infiniti QX56 (JA60). Manual — part 813
POWER SUPPLY AND GROUND CIRCUIT
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< COMPONENT DIAGNOSIS >
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POWER SUPPLY AND GROUND CIRCUIT
SUSPENSION CONTROL UNIT
SUSPENSION CONTROL UNIT : Diagnosis Procedure
INFOID:0000000005148175
Regarding Wiring Diagram information, refer to
.
1.
CHECK FUSES
Check that the following fuses of the suspension control unit are not are not blown.
Are the fuses OK?
YES
>> GO TO 2.
NO
>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2.
POWER SUPPLY CIRCUIT CHECK
1. Disconnect suspension control unit connector B3.
2. Check voltage between the suspension control unit connector
B3 and ground.
Are the voltage results as specified?
YES
>> GO TO 3.
NO
>> • Check connector housings for disconnected or loose terminals.
• Repair harness or connector.
3.
GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Check continuity between suspension control unit harness con-
nector B3 and ground.
Is continuity present?
YES
>> Inspection End.
NO
>> Repair harness or connector.
SUSPENSION AIR COMPRESSOR
SUSPENSION AIR COMPRESSOR : Diagnosis Procedure
INFOID:0000000005148176
Regarding Wiring Diagram information, refer to
.
Unit
Terminals
Signal name
Fuse No.
Suspension control unit
7
Battery power
29
6
Ignition switch ON or START
12
(+)
(-)
OFF
ACC
ON
Connector
Terminal
B3
7
Ground
Battery
voltage
Battery
voltage
Battery
voltage
6
Ground
0V
0V
Battery
voltage
AWEIA0114ZZ
Connector
Terminal
—
Continuity
B3
16
Ground
Yes
ALEIA0028GB
SCS-18
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1.
CHECK COMPRESSOR MOTOR RELAY OPRATION
CONSULT-III
1. Disconnect the suspension air compressor connector C9.
2. Turn ignition switch ON.
3. Select "COMPRESSOR" under AIR LEVELIZER active test
items.
4. While operating the test item, check voltage at the suspension
air compressor connector C9 terminal 4.
Is battery voltage present?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
COMPRESSOR MOTOR RELAY POWER SUPPLY CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Disconnect the compressor motor relay connector.
3. Check continuity between compressor motor relay connector
E131 (A) terminal 3 and suspension air compressor connector
C9 (B) terminal 4.
4. Check continuity between compressor motor relay connector
E131 (A) terminal 3 and ground.
Are the continuity test results as specified?
YES
>> Check compressor motor relay. Refer to
NO
>> Repair harness or connector.
3.
GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Check continuity between suspension air compressor connector
C9 terminals 1 and 3 and ground.
Is continuity present?
YES
>> Inspection End.
NO
>> Repair harness or connector.
HEIGHT SENSOR
HEIGHT SENSOR : Diagnosis Procedure
INFOID:0000000005148177
Regarding Wiring Diagram information, refer to
.
(+)
(-)
Voltage
Connector
Terminal
C9
4
Ground
Battery Voltage
ALEIA0021GB
A
B
Continuity
Connector
Terminal
Connector
Terminal
E131
3
C9
4
Yes
A
—
Continuity
Connector
Terminal
E131
3
Ground
No
ALEIA0022GB
Connector
Terminal
—
Continuity
C9
1
Ground
Yes
3
ALEIA0023GB
POWER SUPPLY AND GROUND CIRCUIT
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< COMPONENT DIAGNOSIS >
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1.
POWER SUPPLY CIRCUIT CHECK
1. Disconnect height sensor connector C8.
2. Turn the ignition switch ON.
3. Check voltage between the height sensor connector C8 terminal
1 and ground.
Is 5V present?
YES
>> GO TO 2.
NO
>> Check harness or connector for open or short. If OK,
replace the suspension control unit. Refer to
RSU-26, "Removal and Installation"
.
2.
GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Check continuity between height sensor connector C8 terminal
3 and ground.
Is continuity present?
YES
>> Ground circuit is OK.
NO
>> Repair harness or connector.
(+)
(-)
Voltage
Connector
Terminal
C8
1
Ground
5V
ALEIA0026GB
Connector Terminal
—
Continuity
C8
3
Ground
Yes
ALEIA0029GB
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< COMPONENT DIAGNOSIS >
COMPRESSOR MOTOR RELAY
COMPRESSOR MOTOR RELAY
Description
INFOID:0000000005148178
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 Check
INFOID:0000000005148179
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
.
Diagnosis Procedure
INFOID:0000000005148180
Regarding Wiring Diagram information, refer to
.
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
ON
: Compressor turns ON
OFF
: Compressor turns OFF
(+)
(-)
Voltage
Connector
Terminal
E130
2
Ground
Battery voltage
ALEIA0030GB
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