Infiniti QX56 (Z62). Manual — part 1105
DIAGNOSIS SYSTEM (AIR LEVELIZER CONTROL MODULE)
SCS-57
< SYSTEM DESCRIPTION >
[AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G
H
I
J
K
L
M
A
B
SCS
N
O
P
ACTIVE TEST
CAUTION:
• Perform the procedure when the vehicle is stopped.
• Be careful that battery is not discharged when performing the procedure while engine is stopped.
VHCL HGT INIT VAL
(V)
• Displays voltage when standard vehicle height is set.
• Value does not change until setting of standard vehicle height is performed again.
COMPRESSOR
Displays operation status of air compressor.
EXH SOLENOID
Displays operation status of exhaust solenoid.
ENG SPEED SIG
Displays operation status of engine.
WARNING LAMP
Displays turning ON status of CK SUSP indicator lamp.
Monitored item (Unit)
Remarks
Item name
Description
COMPRESSOR
Air compressor can be operated.
EXHAUST SOLENOID
Ehaust solenoid of air compressore can be operated.
WARNING LAMP
CK SUSP indicator lamp can be turned ON or OFF.
SCS-58
< ECU DIAGNOSIS INFORMATION >
[AIR LEVELIZER CONTROL SYSTEM]
AIR LEVELIZER CONTROL MODULE
ECU DIAGNOSIS INFORMATION
AIR LEVELIZER CONTROL MODULE
Reference Value
INFOID:0000000006256053
VALUES ON DIAGNOSIS TOOL
TERMINAL LAYOUT
PHYSICAL VALUES
Item name
Condition
Value/Status (Approx.)
IGN VOLT
Ignition switch ON
10 – 16 V
VHCL HT INTLZ STA
Completion of the standard vehicle height setting
CMPLT
Other than the above
INCMP
VHCL HT INIT SLCT
Completion of the standard vehicle height setting
1
Other than the above
0
VHCL HEIGHT SEN
Lift up the vehicle
2.8 – 3.8 V
VHCL HT CNVSN VL
Lift down the vehicle
−
15 – 15 mm
VHCL HGT FIX TIME
Lift up the vehicle
0 h
VHCL HGT INIT VAL
Completion of the standard vehicle height setting
2.800 – 3.800 V
Other than the above
0 V
COMPRESSOR
When the air compressor is operating
On
Other than the above
Off
EXH SOLENOID
When exhaust solenoid is operating
On
Other than the above
Off
ENG SPEED SIG
Engine running
RUN
Other than the above
STOP
WARNING LAMP
When CK SUSP indicator lamp is ON
On
Other than the above
Off
JSDIA0057ZZ
Terminal
(Wire color)
Description
Condition
Reference value
(Approx.)
+
−
Signal name
Input/
Output
2
(B)
Ground
GND
—
Always
Less than 1
Ω
3
(V)
Ground
Air compressor relay
Output
IGN ON
Air compressor: ON
9 – 16 V
Air compressor: OFF
Less than 2 V
4
(L/W)
Ground
Vehicle height sensor
(GND)
—
Always
Less than 1
Ω
AIR LEVELIZER CONTROL MODULE
SCS-59
< ECU DIAGNOSIS INFORMATION >
[AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G
H
I
J
K
L
M
A
B
SCS
N
O
P
Fail-safe
INFOID:0000000006256054
If malfunction is detected, control stops.
The system may enter fail-safe mode under certain conditions (for example, over-laden conditions) when elec-
tronic circuit is normal.
In this case, always check that the system returns to normal by starting engine after unloading load.
DTC Inspection Priority Chart
INFOID:0000000006256055
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC Index
INFOID:0000000006256056
5
(W)
Ground
Vehicle height sensor
(SIGNAL)
Input
IGN ON
0.2 – 4.6 V
IGN OFF
0 V
7
(P)
16
(L)
CAN-L
Input/
Output
—
54 – 69
Ω
9
(P/L)
Ground
Air levelizer control module
power supply
Input
IGN ON
10 – 16 V
IGN OFF
0 V
11
(V/W)
Ground
Exhaust solenoid
Output
IGN ON
Exhaust solenoid: ON
9 – 16 V
Exhaust solenoid: OFF
Less than 2 V
13
(R)
Ground
Vehicle height sensor
(Power supply)
Output
IGN ON
4.5 – 5.5 V
IGN OFF
0 V
16
(L)
7
(P)
CAN-H
Input/
Output
—
54 – 69
Ω
Terminal
(Wire color)
Description
Condition
Reference value
(Approx.)
+
−
Signal name
Input/
Output
Priority
Detected items (DTC)
1
• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT (CAN)
2
• C1801 VHCL HEIGHT SENSOR
• C1802 AIR SUS COMPRS RELAY
• C1803 AIR SUS EXH SOL
• C1806 VHCL HEIGHT SEN FIX
• C1807 VHCL HEIGHT SEN VOLT
3
• C1804 VHCL HEIGHT ADJ UP
• C1805 VHCL HEIGHT ADJ DOWN
• C1808 AIR SUS COMPRS FNCTN
DTC
CONSULT-III display
Reference page
C1801
VHCL HEIGHT SENSOR
C1802
AIR SUS COMPRS RELAY
C1803
AIR SUS EXH SOL
C1804
VHCL HEIGHT ADJ UP
C1805
VHCL HEIGHT ADJ DOWN
C1806
VHCL HEIGHT SEN FIX
C1807
VHCL HEIGHT SEN VOLT
C1808
AIR SUS COMPRS FNCTN
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