2011 INFINITI QX56 sensor

SYSTEMSCS-55
< SYSTEM DESCRIPTION > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
Vehicle height raises [When starting engi
ne, if vehicle height of vehicle rear continues for 30 seconds or more in a
status that is 15 mm (0.59 in) or less than standard vehicle height]
1. Vehicle height sensor detects vehicle height status, and transmits this information to air levelizer control
module.
2. Air levelizer control module turns air compressor relay ON and operates air compressor.
3. Air compressor charges air in air chamber of shock absorber.
4. Vehicle height raises, and control is complete when status is −1 mm ( −0.04 in) of standard vehicle height
value.
Vehicle height lowers [When starting engine, if vehicle height of vehicle rear continues for 30 seconds or more in a
status that is 15 mm (0.59 in) or more of standard vehicle height]
1. Vehicle height sensor detects vehicle height status, and transmits this information to air levelizer control
module.
2. Air levelizer control module turns exhaust solenoid of air compressor ON.
3. Air compressor discharges air from air chamber of shock absorber.
4. Vehicle height lowers, and control is complete when st atus is +1 mm (+0.04 in) of standard vehicle height.
Fail-safeINFOID:0000000006256051
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 re turns to normal by starting engine after unloading load.
JSEIA0221GB
Revision: 2010 May2011 QX56

SCS-56
< SYSTEM DESCRIPTION >[AIR LEVELIZER CONTROL SYSTEM]
DIAGNOSIS SYSTEM (AIR
LEVELIZER CONTROL MODULE)
DIAGNOSIS SYSTEM (AIR LE VELIZER CONTROL MODULE)
CONSULT-III FunctionINFOID:0000000006256052
CONSULT-III APPLICATION ITEMS
WORK SUPPORT
CAUTION:
Perform the procedure when the vehicle is stopped.
SELF DIAGNOSTIC RESULTS
Refer to SCS-59, "DTC Index".
When “CRNT” is displayed on self-diagnosis result,
 The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result, System malfunction in the past is detect ed, but the system is presently normal.
Freeze frame data (FFD)
DATA MONITOR
Diagnostic test mode Function
Work Support This mode enables a technician to adjust some devices faster and more accurately.
Self Diagnostic Results Retrieve DTC from ECU and display diagnostic items.
Data Monitor Monitor the input/output signal of the control unit in real time.
CAN Diagnosis This mode displays a network diagnosis result about CAN by a diagram.
CAN Diagnostic Support
Monitor It monitors the status of CAN communication.
ECU Identification Display the ECU identification number (part number etc.) of the selected system.
Active Test Send the drive signal from CONSULT-III to the actuator. The operation check can be performed.
Item name Description
STANDARD HEIGHT LEVEL Forcibly sets vehicle height to the set standard vehicle height.
ADJUST HEIGHT INI Sets standard vehicle height.
CLEAR HEIGHT INI Erases standard vehicle height.
Item name Description
IGN COUNTER The number of times that ignition switch is turned ON after the DTC is detected is displayed.
 When “0” is displayed: It indicates that the system is presently malfunctioning.
 When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system
is presently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 → 2 → 3...38 → 39.
When the operation number of times exceeds 39, the number do not increase and “39” is displayed until
self-diagnosis is erased.
Monitored item (Unit) Remarks
IGN VOLT (V) Displays the power supply voltage of air levelizer control module.
VHCL HT INTLZ STA Displays setting status of standard vehicle height.
VHCL HT INIT SLCT Displays setting status of standard vehicle height.
VHCL HEIGHT SEN (V) Displays the signal voltage of vehicle height sensor.
VHCL HT CNVSN VL (mm) Displays the vehicle height recognized by air levelizer control module.
VHCL HGT FIX TIME (hour) Displays period of time that signal from vehicle height sensor does not change.
Revision: 2010 May2011 QX56

SCS-58
< ECU DIAGNOSIS INFORMATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR LEVELIZER CONTROL MODULE
ECU DIAGNOSIS INFORMATION
AIR LEVELIZER CONTROL MODULE
Reference ValueINFOID: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
ConditionReference 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
Revision: 2010 May2011 QX56

AIR LEVELIZER CONTROL MODULESCS-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-safeINFOID:0000000006256054
If malfunction is detected, control stops.
The system may enter fail-safe mode under certain condi tions (for example, over-laden conditions) when elec-
tronic circuit is normal.
In this case, always check that the system re turns to normal by starting engine after unloading load.
DTC Inspection Priority ChartINFOID:0000000006256055
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000006256056
5
(W) Ground Vehicle height sensor
(SIGNAL) InputIGN 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 co
ntrol module
power supply InputIGN 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)
OutputIGN ON 4.5 – 5.5 V
IGN OFF 0 V
16
(L) 7
(P) CAN-H Input/
Output — 54 – 69
Ω
Te r m i n a l
(Wire color) Description
ConditionReference 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 SCS-69
C1802 AIR SUS COMPRS RELAYSCS-72
C1803 AIR SUS EXH SOLSCS-74
C1804 VHCL HEIGHT ADJ UPSCS-77
C1805 VHCL HEIGHT ADJ DOWNSCS-80
C1806 VHCL HEIGHT SEN FIXSCS-81
C1807 VHCL HEIGHT SEN VOLTSCS-82
C1808 AIR SUS COMPRS FNCTNSCS-84
Revision: 2010 May2011 QX56

STANDARD VEHICLE HEIGHT SETTINGSCS-67
< BASIC INSPECTION > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
STANDARD VEHICL E HEIGHT SETTING
DescriptionINFOID:0000000006256060
Air levelizer control module enables precise control, by acquiring memorized standard vehicle height and sig-
nal (vehicle height) from vehicle height sensor. For this reason, always set standard vehicle height after per-
forming the following operations.
 Removal and installation or replacement of vehicle height sensor
 Replacement of air levelizer control module
Work ProcedureINFOID:0000000006256061
1.CLEAR STANDARD VEHICLE HEIGHT
With CONSULT-III
1. Lift up the vehicle. CAUTION:
Check that tires never contact the ground.
2. Start the engine.
3. Select “COMPRESSOR” in “Active Test” in “E-SUS”.
4. Touch “ON” and wait 60 seconds or more.
5. Touch “OFF”.
6. Select “CLEAR HEIGHT INI” in “Work Support” in “E-SUS”.
7. Touch “Start”.
8. Touch “Clear”. NOTE:
CONSULT-III continues indicating "EXECUTING". The completion of the standard vehicle height erasing
can be checked by the CK SUSP indicator lamp ON condition.
Does CK SUSP indicator lamp turn ON?
YES >> GO TO 2.
NO >> Perform step 1 again.
2.ADJUST STANDARD VEHICLE HEIGHT
With CONSULT-III
1. Select “ADJUST HEIGHT INI” in “Work Support” in “E-SUS”.
2. Touch “Start”.
3. Touch “Initial 1”. NOTE:
CONSULT-III continues indicating "EXECUTING". T he completion of the standard vehicle height adjust-
ment can be checked by the CK SUSP indicator lamp OFF condition.
Does CK SUSP indicator lamp turn OFF?
YES >> GO TO 3.
NO >> Perform step 1 again.
3. ADJUST VEHICLE HEIGHT
With CONSULT-III
1. Lift down the vehicle. CAUTION:
Check that the lift is fully lowered.
2. Select “STANDARD HEIGHT LEVEL” in “Work Support” in “E-SUS”.
3. Touch “Start”.
4. Touch “Revert” and wait 120 seconds or more.
5. Although CONSULT-III continues indicating "EXECUTIN G", select “VHCL HGT CNVSN VL” in “Data Mon-
itor” in “E-SUS”.
Is value within
−15 – 15 mm?
YES >> GO TO 4.
NO >> Perform step 1 again.
4.CHECK DTC
With CONSULT-III
Revision: 2010 May2011 QX56

C1801 VHCL HEIGHT SENSORSCS-69
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
DTC/CIRCUIT DIAGNOSIS
C1801 VHCL HEIGHT SENSOR
DTC LogicINFOID:0000000006256062
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON and wait 60 seconds or more.
2. Perform “Self Diagnostic Results” in “E-SUS”.
Is
“C1801” detected ?
YES >> Go to SCS-69, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256063
1.CHECK APPEARANCE
Visually check for malfunction of suspension components, installing malfunction, or deformation of vehicle
height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK POWER SUPPLY CIRCUIT (PART 1)
1. Disconnect vehicle height sensor connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Check voltage between vehicle height sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK POWER SUPPLY CIRCUIT (PART 2)
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module connector.
DTC Display itemI Malfunction detected condition Possible cause
C1801 VHCL HEIGHT SENSOR Signal voltage of the vehicle height sensor remains 0.2
V or less or 4.6 V or more continuously for 60 seconds
during sensor voltage (4.5 – 5.5 V) output by the air lev-
elizer control module.  Harness or connectors
(Sensor circuit is open.)
 Vehicle height sensor
 Air levelizer control module
 Rear suspension component parts
Vehicle height sensor —Voltage
Connector Terminal
C13 1 Ground 4.5 – 5.5 V
Revision: 2010 May2011 QX56

SCS-70
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1801 VHCL HEIGHT SENSOR
3. Check continuity between air levelizer control m
odule harness connector and vehicle height sensor har-
ness connector.
4. Check continuity between air levelizer control module harness connector and ground.
Is the inspection result normal?
YES >> 1. Check intermittent incident. Refer to GI-40, "Intermittent Incident".
2. If inspection result is OK, replace the air levelizer control module. Refer to SCS-94, "
Removal
and Installation".
NO >> Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN AIR LEVELIZER CO NTROL MODULE AND VEHICLE HEIGHT SENSOR
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module connector.
3. Check continuity between air levelizer control m odule harness connector and vehicle height sensor har-
ness connector.
4. Check continuity between air levelizer control module harness connector and ground.
Are the inspection results normal?
YES >> GO TO 5.
NO >> Repair or replace damaged parts.
5.CHECK VEHICLE HEIGHT SENSOR
Check the vehicle height sensor. Refer to SCS-70, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace the vehicle height sensor. Refer to SCS-98, "
Removal and Installation".
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace the air levelizer control module. Refer to SCS-94, "Removal and Installation".
NO >> Repair or replace damaged parts.
Component InspectionINFOID:0000000006256064
1.CHECK VEHICLE HEIGHT SENSOR
Air levelizer control module Vehicle height sensor Continuity
Connector Terminal Connector Terminal
B84 13 C13 1 Existed
Air levelizer control module —Continuity
Connector Terminal
B84 13 Ground Not existed
Air levelizer control module Vehicle height sensor Continuity
Connector Terminal Connector Terminal
B84 5
C13 2
Existed
43
Air levelizer control module —Continuity
Connector Terminal
B84 5
Ground Not existed
4
Revision: 2010 May2011 QX56

C1801 VHCL HEIGHT SENSORSCS-71
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
1. Remove the vehicle height sensor. Refer to SCS-98, "Removal and Installation".
2. Check resistance between vehicle height sensor connector ter- minals.
Are the inspection results normal?
YES >> 1. Install the vehicle height sensor. Refer to SCS-94, "Removal and Installation".
2. Perform “STANDARD VEHICLE HEIGHT SETTING”. Refer to SCS-67, "
Work Procedure".
NO >> Replace the vehicle height sensor. Refer to SCS-98, "
Removal and Installation".
Vehicle height sensor
Condition Resistance (Approx.)
Te r m i n a l
12 A position 1.9 – 3.0 k
Ω
B position 320 – 680 Ω
1 3 Always 1.6 – 2.4 k Ω
23 A position 320 – 680
Ω
B position 1.9 – 3.0 k Ω
JSEIA0249ZZ
Revision: 2010 May2011 QX56