INFINITI QX56 2011 Factory Service Manual

AIR LEVELIZER CONTROL SYSTEMSCS-61
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WIRING DIAGRAM
AIR LEVELIZER CONTROL SYSTEM
Wiring DiagramINFOID:0000000006256057
JCEWM0220GB
Revision: 2010 May2011 QX56

SCS-62
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AIR LEVELIZER CONTROL SYSTEM
JCEWM0221GB
Revision: 2010 May2011 QX56

AIR LEVELIZER CONTROL SYSTEMSCS-63
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JCEWM0222GB
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AIR LEVELIZER CONTROL SYSTEM
JCEWM0223GB
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWSCS-65
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000006256058
DETAILED FLOW
1.INTERVIEW FROM THE CUSTOMER
Clarify customer complaints before inspection. First of all, perform an interview utilizing SCS-66, "
Diagnostic
Work Sheet" and reproduce the symptom as well as fully under stand it. Ask customer about his/her complaints
carefully.Check symptoms by driving vehicle with customer, if necessary.
CAUTION:
Customers are not professional. Never guess easily like “maybe the customer means that...,” or “
maybe the customer mentions this symptom”.
>> GO TO 2.
2.CHECK SYMPTOM
Reproduce the symptom that is indicated by the cu stomer, based on the information from the customer
obtained by interview. Also check that the sympt om is not caused by fail-safe mode. Refer to SCS-59, "
Fail-
safe".
CAUTION:
When the symptom is caused by normal operation, fully inspect each portion and obtain the under-
standing of customer that the symptom is not caused by a malfunction.
>> GO TO 3.
3.PERFORM THE SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “E-SUS”.
Is any DTC detected?
YES >> Record or print self-diagnosis results. GO TO 4.
NO >> GO TO 6.
4.RECHECK THE SYMPTOM
With CONSULT-III
1. Erase self-diagnostic results for “E-SUS”.
2. Perform DTC confirmation procedures for the error-detected system.
NOTE:
If some DTCs are detected at the some time, determine the order for performing the diagnosis based on
SCS-59, "
DTC Inspection Priority Chart".
Is any DTC detected?
YES >> GO TO 5.
NO >> Check harness and connectors based on the in formation obtained by interview. Refer to GI-40,
"Intermittent Incident".
5.REPAIR OR REPLACE ERROR-DETECTED PART
 Repair or replace error-detected parts.
 Reconnect part or connector after repairing or replacing.
 When DTC is detected, erase self -diagnostic result for “E-SUS”.
>> GO TO 7.
6.IDENTIFY ERROR-DETE CTED SYSTEM BY SYMPTOM DIAGNOSIS
Estimate error-detected system based on symptom diagnosis and perform inspection.
Can the error-detected system be identified?
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SCS-66
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DIAGNOSIS AND REPAIR WORKFLOW
YES >> GO TO 7.
NO >> Check harness and connectors based on the information obtained by interview. Refer to
GI-40,
"Intermittent Incident".
7.FINAL CHECK
With CONSULT-III
1. Check the reference value for “E-SUS”.
2. Recheck the symptom and check that the symp tom is not reproduced on the same conditions.
Is the symptom reproduced?
YES >> GO TO 3.
NO >> INSPECTION END
Diagnostic Work SheetINFOID:0000000006256059
Description
 In general, customers have their own criteria for a pr oblem. Therefore, it is important to understand the
symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the inte rview sheet referring to the interview points.
 In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
INTERVIEW SHEET SAMPLE
Interview sheet
Custmer
name MR/MS Registration
number Initial year
registration
Vehicle type VIN
Storage date Engine Mileage km/Mile
Symptom † Does not operate ( ) function
† Warning lamp for ( ) turns ON
† Noise † Vibration
† Other
( )
First occurrence † Recently † Other ( )
Frequency of occurrence † Always † Under a certain conditions of † Sometimes ( time/day)
Climate con-
ditions †
Irrelevant
Weather † Fine † Cloud † Rain † Snow † Others ( )
Temperature † Hot † Warm † Cool † Cold † Temp. [Approx. °C ( °F)]
Relative humidity † High † Moderate † Low
Road conditions † Urban area † Suburb area † Highway
† Mountainous road (uphill or downhill) † Rough road
Operating condition, etc. † Irrelevant
† When engine starts † During idling
† During driving † During acceleration † At constant speed driving
† During deceleration
† During cornering (righ t curve or left curve)
† When steering wheel is steered (to right or to left)
Memo
Revision: 2010 May2011 QX56

STANDARD VEHICLE HEIGHT SETTINGSCS-67
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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
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STANDARD VEHICLE HEIGHT SETTING
Select “Self Diagnostic Results” in “E-SUS”.
Is any DTC detected?
YES >> Refer to
SCS-59, "DTC Index".
NO >> SETTING END
Revision: 2010 May2011 QX56

C1801 VHCL HEIGHT SENSORSCS-69
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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
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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
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Air levelizer control module —Continuity
Connector Terminal
B84 5
Ground Not existed
4
Revision: 2010 May2011 QX56