Infiniti QX56 (JA60). Manual — part 810
SUSPENSION CONTROL SYSTEM
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< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
SUSPENSION CONTROL SYSTEM
System Diagram
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System Description
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SUSPENSION CONTROL SYSTEM
The suspension control system consists of the following components
• Suspension control unit
• Compressor motor relay
• Suspension air compressor
• Exhaust valve solenoid (built into suspension air compressor)
• Height sensor
The suspension control unit monitors vehicle ride height as indicated by the height sensor. The suspension
control unit actuates the compressor motor relay to raise the vehicle ride height. The suspension control unit
actuates the exhaust valve solenoid to lower the vehicle ride height.
CK SUSP INDICATOR LAMP
The CK SUSP indicator lamp ground is controlled by the suspension control unit. The indicator lamp will come
on for 2 seconds when the ignition switch is turned ON. If the indicator lamp does not turn OFF there is a fault
detected. Refer to
ALEIA0042GB
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< FUNCTION DIAGNOSIS >
SUSPENSION CONTROL SYSTEM
Component Parts Location
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:Front
Component Description
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1.
Suspension control unit B3 (view with
upper and lower luggage side finishers
LH removed)
2.
Suspension air compressor C9 (view
under vehicle behind LH rear suspen-
sion)
3.
Height sensor C8 (view under vehicle
at LH rear suspension)
4.
Compressor motor relay E130, E131
(view with battery removed)
ALEIA0044ZZ
Part name
Description
Suspension control unit
• Monitors height sensor input to determine vehicle height.
• Actuates the compressor motor relay or exhaust valve solenoid to raise or
lower the vehicle accordingly.
• Sends a ground signal to the combination meter to activate the CK SUSP
indicator lamp.
Suspension air compressor (with built in exhaust valve
solenoid)
• When the compressor is actuated, it pumps air into the system to raise the
rear suspension.
• When the exhaust valve solenoid is actuated, it vents air from the system
to lower the rear suspension.
Height sensor
Provides vehicle height input to the suspension control unit.
DIAGNOSIS SYSTEM (SUSPENSION CONTROL UNIT)
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DIAGNOSIS SYSTEM (SUSPENSION CONTROL UNIT)
CONSULT-III Function
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CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
WORK SUPPORT
Display Item List
DATA MONITOR
Display Item List
ACTIVE TEST
CAUTION:
Do not perform active test while driving.
Display Item List
AIR LEVELIZER diagnosis mode
Description
WORK SUPPORT
Supports inspection and adjustment. Commands are transmitted to the suspension control
unit for setting the status suitable for required operation, input/output signals are received
from the suspension control unit and received data is displayed.
SELF-DIAG RESULTS
Displays suspension control unit self-diagnosis results.
DATA MONITOR
Displays suspension control unit input/output data in real time.
ACTIVE TEST
Operation of electrical loads can be checked by sending drive signal to them.
ECU PART NUMBER
The part number of suspension control unit can be checked.
Item
Description
Condition
STANDARD HEIGHT LEVEL
Resets the vehicle height to the initialization flag
setting stored in the suspension control unit.
Vehicle unladen, set in a horizontal position and
not moving.
NOTE:
Do not take your eyes off the vehicle while CON-
SULT-III is processing.
ADJUST HEIGHT INI
Sets the height initialization flag in the suspen-
sion control unit when the control unit has been
replaced or when the initialization flag has been
cleared using the "CLEAR HEIGHT INI" proce-
dure.
Vehicle unladen, move vehicle forward and back-
ward approx. 5 m (16.4 ft) and rock vehicle side
to side.
NOTE:
Do not move vehicle while CONSULT-III is pro-
cessing.
CLEAR HEIGHT INI
Clears the initialization flag in the suspension
control unit.
Vehicle unladen.
Display item [unit]
ALL
SIGNALS
SELECTION FROM MENU
HEIGT SEN [V]
X
X
HEIGT CALC [mm]
X
X
SEN FIX TIME [HR]
X
X
HEIGT INI VAL [V]
X
X
COMPRESSOR [ON/OFF]
X
X
EXH SOLENOID [ON/OFF]
X
X
ACG L [ON/OFF]
X
X
Test Item
Description
COMPRESSOR
ON/OFF
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< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (SUSPENSION CONTROL UNIT)
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 pressure.
NOTE:
• "TEST IS STOPPED" is displayed approximately 10 seconds after operation starts for all active test items
except "COMPRESSOR".
• After "TEST IS STOPPED" is displayed, to perform test again, repeat step 6.
EXHAUST SOLENOID
ON/OFF
WARNING LAMP
ON/OFF
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