Infiniti QX56 (JA60). Manual — part 811
C1801 VEHICLE HEIGHT SENSOR
SCS-9
< COMPONENT DIAGNOSIS >
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COMPONENT DIAGNOSIS
C1801 VEHICLE HEIGHT SENSOR
Description
INFOID:0000000005148151
The vehicle height sensor operates on a 5 volt reference signal from the suspension control unit. The suspen-
sion control unit also provides ground to the height sensor. Depending on vehicle height, the height sensor
signal should have between 0.2V and 4.8V.
DTC Logic
INFOID:0000000005148152
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148153
1.
CHECK HEIGHT SENSOR OPERATION
CONSULT-III
1. Turn ignition switch ON
2. Select "HEIGT SEN" of AIR LEVELIZER data monitor test item.
Is the HEIGHT SEN voltage within the given range?
YES
>> Height sensor is operating normally.
NO
>> Refer to
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1801
VEHICLE HEIGHT SEN-
SOR
Vehicle height sensor voltage is less than 0.2V
or greater than 4.8V for more than 60 seconds.
• Height sensor power/ground supply. Refer to
SCS-18, "HEIGHT SENSOR : Diagnosis
Procedure"
• Height sensor signal circuit. Refer to
23, "Component Function Check"
.
HEIGHT SEN
: 0.2V - 4.8V
SCS-10
< COMPONENT DIAGNOSIS >
C1802 COMPRESSOR RELAY
C1802 COMPRESSOR RELAY
Description
INFOID:0000000005148154
The compressor motor relay is controlled by the suspension control unit. The suspension control unit supplies
voltage to the coil side of the relay to activate it. The compressor motor relay, when activated, supplies power
to the suspension air compressor.
DTC Logic
INFOID:0000000005148155
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148156
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 air levelizer system com-
ponents 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
.
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1802
COMPRESSOR RELAY
• Driving transistor for the compressor relay is
OFF and monitor voltage continues at a high
level for more than 10 seconds.
• Driving transistor for the compressor relay is
ON and monitor voltage continues at a low
level for more than 5 seconds.
Compressor motor relay. Refer to
.
ON
: Compressor turns ON
OFF
: Compressor turns OFF
C1803 EXHAUST SOLENOID
SCS-11
< COMPONENT DIAGNOSIS >
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C1803 EXHAUST SOLENOID
Description
INFOID:0000000005148157
The exhaust valve solenoid controls the vent function of the suspension control system. The exhaust valve
solenoid is built into the suspension air compressor. The suspension control unit supplies voltage to the
exhaust valve solenoid to activate it.
DTC Logic
INFOID:0000000005148158
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148159
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
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1803 EXHAUST
SOLENOID
• Driving transistor for the exhaust valve sole-
noid is OFF and monitor voltage continues at
a high level for more than 10 seconds.
• Driving transistor for the exhaust valve sole-
noid is ON and monitor voltage continues at
a low level for more than 5 seconds.
Open or short circuit in the exhaust valve sole-
noid control circuit. Refer to
ON
: Air vents and vehicle ride height lowers
OFF
: No air vents and vehicle ride height remains constant
SCS-12
< COMPONENT DIAGNOSIS >
C1804 HEIGHT ADJUSTING MALFUNCTION (COMPRESSOR)
C1804 HEIGHT ADJUSTING MALFUNCTION (COMPRESSOR)
Description
INFOID:0000000005148160
The compressor motor relay is controlled by the suspension control unit. The suspension control unit supplies
voltage to the coil side of the relay to activate it. The compressor motor relay, when activated, supplies power
to the suspension air compressor.
DTC Logic
INFOID:0000000005148161
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148162
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 air levelizer system com-
ponents 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
.
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1804
VEHICLE HEIGHT AD-
JUSTING MALFUNC-
TION (COMPRESSOR)
Continuous compressor relay ON time is more
than 120 seconds.
Compressor motor relay. Refer to
.
ON
: Compressor turns ON
OFF
: Compressor turns OFF
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