2011 INFINITI QX56 water pump

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ENGINE
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CONTENTS
ENGINE COOLING SYSTEM
PRECAUTION ................ ...............................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
PREPARATION ............................................3
PREPARATION .............................................. .....3
Commercial Service Tools ................................. ......3
SYSTEM DESCRIPTION ..............................4
DESCRIPTION ............................................... .....4
Engine Cooling System ..................................... ......4
Engine Cooling System Schematic .........................5
SYMPTOM DIAGNOSIS ...............................6
OVERHEATING CAUSE ANALYSIS ............. .....6
Troubleshooting Chart ........................................ ......6
PERIODIC MAINTENANCE ..........................8
ENGINE COOLANT ....................................... .....8
Inspection ............................................................ ......8
Draining .....................................................................8
Refilling .....................................................................9
Flushing ...................................................................10
RADIATOR .........................................................11
RESERVOIR TANK CAP ..........................................11
RESERVOIR TANK CAP : Inspection ................. ....11
RADIATOR ............................................................. ....11
RADIATOR : Inspection ...........................................11
REMOVAL AND INSTALLATION ...............13
RADIATOR ....................................... .................13
Exploded View ..................................................... ....13
Removal and Installation .........................................13
Inspection ................................................................15
COOLING FAN ..................................................16
Exploded View .........................................................16
Removal and Installation .........................................16
Inspection ................................................................17
WATER PUMP ..................................................18
Exploded View .........................................................18
Removal and Installation .........................................18
Inspection ................................................................19
WATER INLET AND THERMOSTAT ASSEM-
BLY ....................................................................
20
Exploded View .........................................................20
Removal and Installation .........................................20
Inspection ................................................................21
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .............................................
23
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
23
Periodical Maintenance Specification ................ ....23
Radiator ...................................................................23
Thermostat ..............................................................23
Revision: 2010 May2011 QX56

CO-6
< SYMPTOM DIAGNOSIS >
OVERHEATING CAUSE ANALYSIS
SYMPTOM DIAGNOSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000006289656
Symptom Check items
Cooling sys-
tem parts
malfunction Poor heat transfer
Water pump malfunction Worn or loose drive belt
—
Thermostat stuck closed —
Damaged fins
Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow Cooling fan does not oper-
ate
Fan assembly —
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio ———
Poor engine coolant quality — Engine coolant density —
Insufficient engine coolant Engine coolant leakageCooling hose
Loose clamp
Cracked hose
Water pump Poor sealing
Radiator cap Loose
Poor sealing
Radiator O-ring for da
mage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tank Exhaust gas leakage into
cooling system Cylinder head deterioration
Cylinder head gasket deteri-
oration
Revision: 2010 May2011 QX56

CO-18
< REMOVAL AND INSTALLATION >
WATER PUMP
WATER PUMP
Exploded ViewINFOID:0000000006289669
Removal and InstallationINFOID:0000000006289670
CAUTION:
 When removing water pump assembly, be careful not to get engine coolant on drive belts.
 Water pump cannot be disassembled and should be replaced as a unit.
 After installing water pump, co nnect hose and clamp securely, then check for leakage using the radi-
ator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service
tool).
REMOVAL
1. Drain engine coolant from drain plugs on radiator and cylinder block. Refer to CO-8, "Draining" and EM-
103, "Setting".
CAUTION:
 Perform this step when engine is cold.
 Never spill engine coolant on drive belt.
2. Remove front under cover with power tool. Refer to EXT-25, "
Exploded View".
3. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
4. Move reservoir tank to the position with out the hindrance for work. Refer to CO-13, "
Exploded View".
5. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
6. Remove fan shroud (upper). Refer to CO-13, "
Exploded View".
7. Remove drive belt. Refer to EM-20, "
Exploded View".
8. Remove cooling fan, fan coupling, cooling fan pulley and bracket. Refer to CO-16, "
Exploded View"
9. Remove radiator hose (upper). Refer to CO-13, "Exploded View".
10. Remove water pump pulley.
1. Water pump pulley 2. Water pump 3. Gasket
Refer to GI-4, "
Components" for symbols in the figure.
JPBIA2316GB
Revision: 2010 May2011 QX56

WATER PUMPCO-19
< REMOVAL AND INSTALLATION >
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11. Remove water pump. Refer to
CO-18, "Exploded View".
 Engine coolant will leak from cylinder block, so have a receptacle ready under vehicle.
CAUTION:
 Handle the water pump vane so that it does not contact any other parts.
 Never disassemble water pump.
INSTALLATION
Install in the reverse order of removal.
InspectionINFOID:0000000006289671
INSPECTION AFTER REMOVAL
 Visually check that there is no significant dirt or rusting on water pump body and vane (A).
 Check there is no slack in vane shaft, and that it turns smoothly when rotated by hand.
 If anything is found, replace water pump.
INSPECTION AFTER INSTALLATION
 Check that the reservoir tank cap is tightened.
 Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) and the
radiator cap tester (commercial service tool). Refer to CO-8, "
Inspection".
 Start and warm up the engine. Visually check that there is no leakage of engine coolant.
JPBIA2315ZZ
Revision: 2010 May2011 QX56

EC-76
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
EVAP DIAG READY  Ignition switch: ON Indicates the ready condi-
tion of EVAP leak diagnosis.
VVEL LEARN  Ignition switch: OFF
→ ON
(After warming up) VVEL learning has no
t been performed
yet. YET
VVEL learning has already been per-
formed successfully. DONE
VVEL SEN LEARN-B1  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL SEN LEARN-B2  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL POSITION SEN-
B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL POSITION SEN-
B2  Engine: After warming up
 Selector lever: P or N position
 Air conditioner switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL TIM-B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
VVEL TIM-B2  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
FPCM  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load  Engine: Cranking HI
 Revving engine from idle to 4,000 rpm
quickly MID
 Engine: Idle
 Engine coolant temperature: More than 10 °C (50 °F) LOW
BAT TEMP SEN  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
Indicates the temperature
around the battery.
COOLING FAN SPD  Engine speed: Idle
 Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Water temp: Less than 98
°C Approx. 100 – 200 rpm
Water temp: More than 98 °C Approx. 600 – 700 rpm
THRTL STK CNT B1 NOTE:
The item is indicated, but not used. —
HO2 S2 DIAG2(B1) NOTE:
The item is indicated, but not used.
—
HO2 S2 DIAG2(B2) NOTE:
The item is indicated, but not used. —
FUEL INJ TIMG Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 16 deg
2,000 rpm Approx.
−170 deg
H/P FUEL PUMP DEG  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 211.0 deg
2,000 rpm Approx. 206.0 deg
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

P0087, P0088, P0090 FRP CONTROL SYSTEM
EC-195
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0087, P0088, P0090 FRP CONTROL SYSTEM
DTC LogicINFOID:0000000006217784
DTC DETECTION LOGIC
NOTE:

If DTC P0087 or P0090 is displayed with DTC P1197, first perform the trouble diagnosis for DTC
P1197.
 DTC P0087 or P0090 may be displayed when running out of gas.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
1. Check that the fuel tank is 1/8 full of fuel.
2. Warm up the engine to the normal operating temperature and keep the engine speed at idle for 60 sec- onds.
NOTE:
Warm up the engine until “COOLAN TEMP/S” on “DATA MONITOR” of CONSULT-III reaches at least
70 °C (158 °F).
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-196, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Cool the engine until the engine coolant temperature reaches 60 °C (140 °F) or less.
2. Start the engine and wait at least 60 seconds.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-196, "Diagnosis Procedure".
NO >> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0087 High fuel pressure too low The following condition continues for 5
seconds or more after engine start (re-
gardless of water temperature): Target
fuel pressure
− Actual fuel pressure ≥
2.7 MPa (27 bar, 27.5 kg/cm
2, 392 psi)
 Harness or connectors(The fuel pump circuit is open or shorted.)
 Fuel system
P0088 high fuel pressure too high The following condition continues for 5
seconds or more after engine start (re-
gardless of water temperature):Actual
fuel pressure
− Target fuel pressure ≥
2.7 MPa (27 bar, 27.5 kg/cm
2, 392 psi)
P0090 High pressure fuel pump per-
formance Fuel rail pressure remains at 1.5 MPa
(15 bar, 15.3 kg/ cm
2, 217.5 psi) or less
for 3 seconds or more during engine rev.
Revision: 2010 May2011 QX56

P0181 FTT SENSOREC-273
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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Component Inspection (Fuel
Tank Temperature Sensor)INFOID:0000000006288291
1.CHECK FUEL TANK TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Remove fuel level sensor unit.
4. Check resistance between “fuel level sensor unit and fuel pump ” terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump”.
Terminals Condition Resistance (k Ω)
4 and 5 Temperature [ °C ( °F)] 20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
JMBIA0167ZZ
Revision: 2010 May2011 QX56

P0182, P0183 FTT SENSOREC-275
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connector.
4.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and “combination
meter” harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between “fuel level s ensor unit and fuel pump” and “combination meter”
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connector.
6.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-275, "
Component Inspection (Fuel Tank Temperature Sensor)".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace “fuel level sensor unit and fuel pump”. Refer to FL-5, "
Removal and Installation".
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (Fuel Tank Temperature Sensor)INFOID:0000000006288294
1.CHECK FUEL TANK TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Remove fuel level sensor unit.
4. Check resistance between “fuel level sensor unit and fuel pump ” terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump”.
Fuel level sensor unit and fuel pump Combination meter
Continuity
Connector Terminal Connector Terminal
C5 5 M34 24 Existed
Terminals Condition Resistance (k Ω)
4 and 5 Temperature [ °C ( °F)] 20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
JMBIA0167ZZ
Revision: 2010 May2011 QX56