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![INFINITI QX56 2011 Factory Service Manual
POWER SUPPLY AND GROUND CIRCUITSCS-89
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:000000000625 INFINITI QX56 2011 Factory Service Manual
POWER SUPPLY AND GROUND CIRCUITSCS-89
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:000000000625](/manual-img/42/57033/w960_57033-4448.png)
POWER SUPPLY AND GROUND CIRCUITSCS-89
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006256088
1.CHECK AIR LEVELIZER CONTROL MODUL E IGNITION POWER SUPPLY CIRCUIT
1. Disconnect air levelizer control module connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Check voltage between the air levelizer control module harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN AI R LEVELIZER CONTROL MODULE AND IPDM E/R
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between air levelizer contro l module harness connector and IPDM E/R harness connec-
tor.
4. Check continuity between air levelizer control module harness connector ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK IPDM E/R
Check the IPDM E/R. Refer to PCS-10, "
Diagnosis Description".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-40, "Intermittent Incident".
NO >> Repair or replace damaged parts.
Air levelizer control module
—Voltage
Connector Terminal
B84 9 Ground 10 – 16 V
Air levelizer control module IPDM E/R Continuity
Connector Terminal Connector Terminal
B84 9 E10 5 Existed
Air levelizer control module
—Continuity
Connector Terminal
B84 9 Ground Not existed
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
SCS-90
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
CK SUSP INDICATOR LAMP CIRCUIT
CK SUSP INDICATOR LAMP CIRCUIT
DescriptionINFOID:0000000006256089
Air levelizer control module transmits INFINITI QX56 2011 Factory Service Manual
SCS-90
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
CK SUSP INDICATOR LAMP CIRCUIT
CK SUSP INDICATOR LAMP CIRCUIT
DescriptionINFOID:0000000006256089
Air levelizer control module transmits](/manual-img/42/57033/w960_57033-4449.png)
SCS-90
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
CK SUSP INDICATOR LAMP CIRCUIT
CK SUSP INDICATOR LAMP CIRCUIT
DescriptionINFOID:0000000006256089
Air levelizer control module transmits CK SUSP indicator lamp signal to combination meter via CAN communi-
cation, when setting of standard vehicle height is incomplete. Based on the signal, combination meter turns
CK SUSP indicator lamp ON.
Component Function CheckINFOID:0000000006256090
1.CHECK CK SUSP INDICATOR LAMP OPERATION
CONSULT-III
1. Turn ignition switch ON.
2. Select “WARNING LAMP” in “Active Test” in “E-SUS”.
3. While operating test item, check that the CK SUSP indicator lamp activates.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Refer to SCS-90, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006256091
1.PERFORM SELF-DIAGNOSIS
CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” in “E-SUS”.
Are any DTC detected?
YES >> Refer to SCS-59, "DTC Index".
NO >> GO TO 2.
2.CHECK COMBINATION METER
Check combination meter. Refer to MWI-29, "
On Board Diagnosis Function".
Is the inspection result normal?
YES >> Replace the air levelizer control module. Refer to SCS-94, "Removal and Installation".
NO >> Repair or replace the combination meter. Refer to MWI-85, "
Removal and Installation".
ON : CK SUSP indicator lamp turns ON
OFF : CK SUSP indicator lamp turns OFF
Revision: 2010 May2011 QX56
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VEHICLE HEIGHT CANNOT BE RAISEDSCS-91
< SYMPTOM DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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SYMPTOM DIAGNOSIS
VEHICLE HEIGHT CANNOT BE RAISED
DescriptionINFOID:0000000006256092
Vehicle height remains in low status.
Diagnosis ProcedureINFOID:0000000006256093
1.CHECK APPEARANCE
Visually check for fuse, malfunction of suspension components, installation malfunction, or deformation of
vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” in “E-SUS”.
Are any DTC detected?
YES >> Refer to SCS-59, "DTC Index".
NO >> GO TO 3.
3.PERFORM STANDARD VEHICLE HEIGHT SETTING
Refer to SCS-67, "
Work Procedure".
Is the symptom improved?
YES >> INSPECTION END
NO >> Replace the air levelizer control module. Refer to SCS-94, "
Removal and Installation".
Revision: 2010 May2011 QX56
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SCS-92
< SYMPTOM DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
VEHICLE HEIGHT CANNOT BE LOWERED
VEHICLE HEIGHT CANNOT BE LOWERED
DescriptionINFOID:0000000006256094
Vehicle height remains in high status.
Diagnosis ProcedureINFOID:0000000006256095
1.CHECK APPEARANCE
Visually check for fuse, malfunction of suspension components, installation malfunction, or deformation of
vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” in “E-SUS”.
Are any DTC detected?
YES >> Refer to SCS-59, "DTC Index".
NO >> GO TO 3.
3.PERFORM STANDARD VEHICLE HEIGHT SETTING
Refer to SCS-67, "
Work Procedure".
Is the symptom improved?
YES >> INSPECTION END
NO >> Replace the air levelizer control module. Refer to SCS-94, "
Removal and Installation".
Revision: 2010 May2011 QX56
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CK SUSP INDICATOR LAMP DOES NOT TURN OFF
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CK SUSP INDICATOR LAMP DOES NOT TURN OFF
DescriptionINFOID:0000000006256096
CK SUSP indicator lamp turns ON while driving the vehicle.
CK SUSP indicator lamp does not turn ON after the completion of standard vehicle height setting.
Diagnosis ProcedureINFOID:0000000006256097
1.STANDARD VEHICLE HEIGHT SETTING
Perform “STANDARD VEHICLE HEIGHT SETTING”. Refer to SCS-67, "
Work Procedure".
Does CK SUSP indicator lamp turn OFF?
YES >> INSPECTION END
NO >> Replace the air levelizer control module. Refer to SCS-94, "
Removal and Installation".
Revision: 2010 May2011 QX56
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SCS-94
< REMOVAL AND INSTALLATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR LEVELIZER CONTROL MODULE
REMOVAL AND INSTALLATION
AIR LEVELIZER CONTROL MODULE
Exploded ViewINFOID:0000000006256098
Removal and InstallationINFOID:0000000006256099
REMOVAL
CAUTION:
Never impact on air levelizer contro
l module when removing or installing air levelizer control module.
1. Disconnect battery cable from negative terminal.
2. Remove luggage side lower finisher (LH). Refer to INT-33, "
Exploded View".
3. Disconnect air levelizer control module harness connector.
4. Remove the air levelizer control module.
INSTALLATION
Install in the reverse order of removal.
AdjustmentINFOID:0000000006256100
After air levelizer control module is replaced, perform “STANDARD VEHICLE HEIGHT SETTING”. Refer to
SCS-67, "
Work Procedure".
1. Air levelizer control module
:Vehicle front
Refer to GI-4, "
Components" for symbols not described on the above.
JSEIA0237GB
Revision: 2010 May2011 QX56
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AIR COMPRESSOR/AIR TUBESCS-95
< REMOVAL AND INSTALLATION > [AIR LEVELIZER CONTROL SYSTEM]
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AIR COMPRESSOR/AIR TUBE
Exploded ViewINFOID:0000000006256101
Removal and InstallationINFOID:0000000006256102
REMOVAL
CAUTION:
Seal the removed part using vinyl tape for preventi ng dirt from getting on or entering the removed
part.
1. Lift up the vehicle.
2. Remove the cover.
3. Disconnect the air compressor harness connector.
1. Air tube A 2. Air tube B 3. Bracket
4. Air compressor 5. Clip 6. Cover
7. Insulator 8. Washer 9. Exhaust tube
10. Exhaust tube connector
A. To rear shock absorber (RH) B. To rear shock absorber (LH) C. To frame
: Vehicle front
Refer to GI-4, "
Components" for symbols not described on the above.
JSEIA0227GB
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
SCS-96
< REMOVAL AND INSTALLATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR COMPRESSOR/AIR TUBE
4. Using a small spanner, remove the air tube A (1) and B (2) from
air compressor.
CAUTION:
Be careful since INFINITI QX56 2011 Factory Service Manual
SCS-96
< REMOVAL AND INSTALLATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR COMPRESSOR/AIR TUBE
4. Using a small spanner, remove the air tube A (1) and B (2) from
air compressor.
CAUTION:
Be careful since](/manual-img/42/57033/w960_57033-4455.png)
SCS-96
< REMOVAL AND INSTALLATION >[AIR LEVELIZER CONTROL SYSTEM]
AIR COMPRESSOR/AIR TUBE
4. Using a small spanner, remove the air tube A (1) and B (2) from
air compressor.
CAUTION:
Be careful since air flows swiftly from air tube.
5. Remove the exhaust tube (1) from exhaust tube connector (2).
6. Remove the exhaust tube connector only when it is damaged.
7. Remove the exhaust tube from air compressor.
8. Remove the air compressor from bracket.
9. Rmove the bracket from vehicle.
10. Remove the air tube A and B from rear shock absorbers RH and LH, according to the procedure in step 4.
11. Remove the air tube A and B from vehicle.
12. Perform inspection after removal. Rfer to SCS-97, "
Inspection".
INSTALLATION
Note the following, and install in the reverse order of the removal.
When installing air tube (1) to air compressor or shock absorber,
insert as shown in the figure.
Dry each component thoroughly before installing, to prevent mois-
ture from entering air compressor.
JSEIA0238ZZ
JSEIA0239ZZ
JSEIA0240GB
Revision: 2010 May2011 QX56