INFINITI QX56 2011 Factory Service Manual

ENGINE CONTROL SYSTEM SYMPTOMSEC-527
< SYMPTOM DIAGNOSIS > [VK56VD]
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Air Air duct
55555 5 EM-28
Air cleaner
EM-27
Air leakage from air duct
(Mass air flow sensor — electric
throttle control actuator)
5555 EM-28
Electric throttle control actuator
EC-460
Air leakage from intake manifold/
Collector/GasketEM-30
Cranking Battery
111111
11
PG-161
Generator circuit
CHG-13
Starter circuit 3STR-11
Signal plate 6EM-106
PNP signal 4EC-383
Engine Cylinder head
55555 55 5 EM-92
Cylinder head gasket 4 3
Cylinder block
66666 66 6 4
EM-115
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Va l v e
mecha-
nism Timing chain
55555 55 5 EM-72
Camshaft
EM-77
Intake valve timing controlEM-61
Intake valve
3EM-92
Exhaust valve
Exhaust Exhaust manifold/Tube/Muffler/ Gasket 55555 55 5 EM-42
EX-6Three way catalystSYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Revision: 2010 May2011 QX56

E C -528
< SYMPTOM DIAGNOSIS >[VK56VD]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.Lubrica-
tion
Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler 55555 55 5 EM-56
EM-60
LU-9
LU-12
LU-14
Oil level (Low)/Filthy oil
LU-7
Cooling
Radiator/Hose/Radiator filler cap
55555 55 45 CO-11
CO-11
Thermostat 5
CO-21
Water pumpCO-19
Water galleryEM-115
Cooling fan
5CO-17
Coolant level (Low)/Contaminat-
ed coolant
CO-8
IVIS (INFINITI Vehicle Immobilizer System —
NATS)11
SEC-48
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Revision: 2010 May2011 QX56

NORMAL OPERATING CONDITIONEC-529
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006218029
FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED)
If the engine speed is above 1,800 rpm under no load (for ex
ample, the selector lever position is neutral and
engine speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-
ies based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration cont rol listed under direct injection gasoline System, EC-36,
"DIRECT INJECTION GASOLINE SYSTEM : System Description".
Revision: 2010 May2011 QX56

EC-530
< PERIODIC MAINTENANCE >[VK56VD]
IDLE SPEED
PERIODIC MAINTENANCE
IDLE SPEED
InspectionINFOID:0000000006218030
1.CHECK IDLE SPEED
WITH CONSULT-III
Check idle speed in “DATA MONITOR” mode with CONSULT-III.
WITH GST
Check idle speed with Service $01 of GST.
>> INSPECTION END
Revision: 2010 May2011 QX56

IGNITION TIMINGEC-531
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IGNITION TIMING
InspectionINFOID:0000000006218031
1.CHECK IGNITION TIMING
1. Attach timing light to loop wire as shown.
2. Check ignition timing.
>> INSPECTION END
1. Loop wire
A. Timing light B. Timing indicator
JSBIA0492ZZ
Revision: 2010 May2011 QX56

EC-532
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EVAP LEAK CHECK
EVAP LEAK CHECK
InspectionINFOID:0000000006267340
CAUTION:
 Do not use compressed air or a high pressure pump.
 Do not exceed 4.12 kPa (0.042 kg/cm
2, 0.6 psi) of pressure in EVAP system.
NOTE:
 Do not start engine.
 Improper installation of EVAP service port adapter (com mercial service tool) to the EVAP service port may
cause a leak.
WITH CONSULT-III
1. To locate the EVAP leak, install EVAP service port adapter (com- mercial service tool) and pressure pump to EVAP service port.
2. Turn ignition switch ON.
3. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT” mode with CONSULT-III.
4. Touch “START”. A bar graph (Pressure indicating display) will appear on the screen.
5. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
6. Remove EVAP service port adapter (commercial service tool) and hose with pressure pump.
7. Locate the leak using a leak detector (commercial service tool). Refer to EC-45, "
EVAPORATIVE EMISSION SYSTEM : System
Diagram".
WITHOUT CONSULT-III
1. To locate the EVAP leak, install EVAP service port adapter (com-
mercial service tool) and pressure pump to EVAP service port.
2. Apply battery voltage between the terminals of EVAP canister vent control valve to ma ke a closed EVAP system.
3. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm
2, 0.2 to 0.4 psi).
4. Remove EVAP service port adapter (commercial service tool) and hose with pressure pump.
SEF462UA
SEF200U
SEF462UA
Revision: 2010 May2011 QX56

EVAP LEAK CHECKEC-533
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5. Locate the leak using a leak detector (commercial service tool).
Refer to EC-45, "
EVAPORATIVE EMISSION SYSTEM : System
Diagram".
SEF200U
Revision: 2010 May2011 QX56

EC-534
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POSITIVE CRANKCASE VENTILATION
POSITIVE CRANKCASE VENTILATION
InspectionINFOID:0000000006218033
1.CHECK PCV VALVE
With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace PCV valve. Refer to EM-33, "
Exploded View".
PBIB1589E
Revision: 2010 May2011 QX56

ECM
EC-535
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REMOVAL AND INSTALLATION
ECM
Removal and InstallationINFOID:0000000006218034
REMOVAL
1. Remove the battery and battery tray. Refer to
PG-164, "Removal and Installation".
2. Disconnect ECM harness connectors (1) as shown in the figure.
3. Remove ECM bracket bolts (A).
4. Separate ECM (2) and ECM bracket (3).
INSTALLATION
Install in the reverse order of removal.
CAUTION:
Must be perform additi onal service when replacing ECM. Refer to EC-143, "
Work Procedure".
JSBIA0307ZZ
Revision: 2010 May2011 QX56

EC-536
< REMOVAL AND INSTALLATION >[VK56VD]
VVEL CONTROL MODULE
VVEL CONTROL MODULE
Removal and InstallationINFOID:0000000006218035
REMOVAL
1. Disconnect VVEL control module harness connector.
2. Remove the fix bolts. And then remove VVEL control module.
INSTALLATION
Install in the reverse order of removal.
CAUTION:
Must be perform additional
service when replacing VVEL control module. Refer to EC-144, "
Work Pro-
cedure".
Revision: 2010 May2011 QX56