water pump INFINITI FX35 2008 User Guide

CO-34
< SERVICE INFORMATION >[VK45DE]
OVERHEATING CAUSE ANALYSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000001325866
Symptom Check items
Cooling sys-
tem parts
malfunction Poor heat transfer
Water pump malfunction Worn or loose drive belt
—
Thermostat and water con-
trol valve 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 leaksCooling 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 leaks into cool-
ing system Cylinder head deterioration
Cylinder head gasket deteri-
oration
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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CO-48
< SERVICE INFORMATION >[VK45DE]
COOLING FAN
COOLING FAN
Component (Crankshaft Driven type)INFOID:0000000001325877
Removal and InstallationINFOID:0000000001325878
REMOVAL
1. Remove air duct (inlet). Refer to
EM-173, "Component".
2. Remove engine front undercover with power tool.
3. Remove radiator shroud (lower). Refer to CO-40, "
Component".
4. Remove drive belts. Refer to EM-170, "
Component".
5. Remove fan coupling and cooling fan assembly. CAUTION:
Do not damage or scratch ra diator core when removing.
6. Remove cooling fan from fan coupling.
INSPECTION AFTER REMOVAL
Fan Coupling
Inspect fan coupling for oil leakage and bimetal conditions.
 If anything is found, replace fan coupling.
Cooling Fan
Inspect cooling fan for crack or unusual bend.
 If anything is found, replace cooling fan.
INSTALLATION
Note the following, install in the reverse order of removal.
 Install cooling fan with its front mark “F” facing fr ont of vehicle. Refer to "Removal and Installation".
1. Cooling fan 2. Fan coupling 3. Fan and water pump pulley
4. Water pump
PBIC1537E
SLC072
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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CO-50
< SERVICE INFORMATION >[VK45DE]
WATER PUMP
WATER PUMP
ComponentINFOID:0000000001325882
Removal and InstallationINFOID:0000000001325883
CAUTION:
 When removing water pump, be careful no
t to get engine coolant on drive belts.
 Water pump can not be disassembled and should be replaced as a unit.
 After installing water pump, connect hose and clamp securely, then check for leaks using radiator
cap tester (commercial service tool) and radiator cap tester adapter (commercial service tool).
REMOVAL
1. Drain engine coolant from drain plugs on radiator and both side of cylinder block. Refer to CO-37, "Chang-
ing Engine Coolant" and EM-242, "Disassembly and Assembly".
CAUTION:
 Perform this step when engine is cold.
 Do not spill engine coolant on drive belts.
2. Remove following parts:  Engine front undercover
 Air duct (inlet): Refer to EM-173, "
Component".
 Alternator, water pump and A/C compressor belt: Refer to EM-170, "
Component".
3. Remove fan coupling with cooling fan, and then fan and water pump pulley.
4. Remove water pump.  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.
 Do not disassemble water pump.
INSPECTION AFTER REMOVAL
1. Fan and water pump pulley 2. Water pump 3. Gasket
PBIC1538E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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WATER PUMPCO-51
< SERVICE INFORMATION > [VK45DE]
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 Visually check that there is no significant dirt or rusting on water
pump body and vane.
 Make sure there is no looseness in vane shaft, and that it turns
smoothly when rotated by hand.
 If anything is found, replace water pump.
INSTALLATION
Install in the reverse order of removal.
INSPECTION AFTER INSTALLATION
 Check for leaks of engine coolant using radiator cap tester adapter (commercial service tool) and radiator
cap tester (commercial service tool). Refer to CO-37, "
Inspection".
 Start and warm up engine. Visually check if there is no leaks of engine coolant.
PBIC1539E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DI-6
< SERVICE INFORMATION >
COMBINATION METERS
 Combination meter indicates the engine speed according to engine speed signal.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
 ECM provides engine coolant temperature signal to unified meter and A/C amp. with CAN communication.
 Unified meter and A/C amp. transmits engine coolant temperature signal to combination meter with commu-
nication line.
 Combination meter indicates the engine coolant temper ature according to engine coolant temperature sig-
nal.
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
 Unified meter and A/C amp. reads a resistor signal from fuel level sensor.
Signal is supplied- from unified meter and A/C amp. terminal 36
- through the fuel level sensor unit and fuel pump (main) terminals 5 and 2, and
- through the fuel level sensor unit (sub) terminals 2 and 1
- to unified meter and A/C amp. terminal 28 for the fuel gauge.
 Unified meter and A/C amp. provides a fuel level signal to combination meter with communication line.
 Combination meter indicates the approximate fuel level according to the fuel level signal.
ODO/TRIP METER
 ABS actuator and electric unit (control unit) provi des a vehicle speed signal to the unified meter and A/C
amp. with CAN communication.
 Unified meter and A/C amp. converts the vehicle s peed signal to the 8-pulse signal, and outputs the vehicle
speed signal (8-pulse) to combination meter.
 Combination meter uses the vehicle speed signal (8- pulse) to calculate the mileage, and displays it.
How to Change The Display For Odo/trip Meter
PKIB7631E
PKIB7632E
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-96
< SERVICE INFORMATION >[VQ35DE]
TROUBLE DIAGNOSIS
Symptom Matrix Chart
INFOID:0000000001325930
SYSTEM — BASIC ENGINE CONTROL SYSTEM
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
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
Fuel Fuel pump circuit 11232 22 3 2 EC-558
Fuel pressure regulator system 334444444 4EC-87
Fuel injector circuit 11232 22 2EC-552
Evaporative emission system 334444444 4EC-40
Air Positive crankcase ventilation sys-
tem 334444444 41
EC-51
Incorrect idle speed adjustment 1 1 1 1 1 EC-80
Electric throttle control actuator 112332222 2 2EC-494,
EC-504
IgnitionIncorrect ignition timing adjustment33111 11 1 EC-80
Ignition circuit 11222 22 2EC-569
Power supply and ground circuit 22333 33 23 EC-140
Mass air flow sensor circuit
1
12 2
222 2 EC-175,
EC-182
Engine coolant temperature sensor circuit
333
EC-193,
EC-204
Air fuel ratio (A/F) sensor EC-220
EC-220
EC-228
EC-236
EC-532
Throttle position sensor circuit
22EC-198
,
EC-302
,
EC-447
,
EC-449
,
EC-518
Accelerator pedal position sensor circuit 3 2 1 EC-424
,
EC-506
,
EC-512
,
EC-524
Knock sensor circuit 2 3 EC-315
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TROUBLE DIAGNOSISEC-99
< SERVICE INFORMATION > [VQ35DE]
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1 - 6: The numbers refer to the order of inspection. Exhaust Exhaust manifold/Tube/Muffler/
Gasket 55555 55 5 EM-26
,
EX-
3Three way catalyst
Lubrica-
tion Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
55555 55 5 EM-30
,
LU-
15, LU-8,
LU-12
Oil level (Low)/Filthy oil LU-5
Cooling
Radiator/Hose/Radiator filler cap
55555 55 45 CO-13,
CO-16
Thermostat 5 CO-27
Water pumpCO-22
Water galleryCO-29
Cooling fan 5EC-210
Coolant level (Low)/Contaminat-
ed coolant5
CO-10
IVIS (Infiniti Vehicle Immobilizer System —
NATS) 11 EC-53 or
BL-185
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
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DTC P0181 FTT SENSOREC-297
< SERVICE INFORMATION > [VQ35DE]
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5.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect “unified meter and A/C amp.” harness connector.
3. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 5 and “unified meter and
A/C amp.” terminal 36. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors B1, M11
 Harness for open or short between “fuel level sensor unit and fuel pump” and “unified meter and A/C amp.”
>> Repair open circuit or short to ground or short to power in harness or connector.
7.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-297, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Replace fuel level sensor unit.
8.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
Component InspectionINFOID:0000000001326114
FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 4 and 5 by heating with hot water as shown in the fig-
ure.
If NG, replace fuel level sensor unit.
Removal and InstallationINFOID:0000000001326115
FUEL TANK TEMPERATURE SENSOR
Refer to FL-4.
Continuity should exist.
Temperature
°C ( °F) Resistance k Ω
20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
PBIB0931E
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

DTC P0182, P0183 FTT SENSOREC-301
< SERVICE INFORMATION > [VQ35DE]
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3. Check harness continuity between “fuel level sensor
unit and fuel pump” terminal 5 and “unified meter and
A/C amp.” terminal 36. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors B1, M11
 Harness for open or short between “fuel level sensor unit and fuel pump” and “unified meter and A/C amp.”
>> Repair open circuit or short to ground or short to power in harness or connector.
7.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-301, "
Component Inspection".
OK or NG
OK >> GO TO 8.
NG >> Replace fuel level sensor unit.
8.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
>> INSPECTION END
Component InspectionINFOID:0000000001326121
FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 4 and 5 by heating with hot water as shown in the fig-
ure.
If NG, replace fuel level sensor unit.
Removal and InstallationINFOID:0000000001326122
FUEL TANK TEMPERATURE SENSOR
Refer to FL-4.
Continuity should exist.
Temperature
°C ( °F) Resistance k Ω
20 (68) 2.3 - 2.7
50 (122) 0.79 - 0.90
PBIB0931E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

EC-344
< SERVICE INFORMATION >[VQ35DE]
DTC P0442 EVAP CONTROL SYSTEM
4. Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction manual for more details.
Refer to EC-40, "
Description".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
7.CHECK FOR EVAP LEAK
Without CONSULT-III
1. Turn ignition switch OFF.
2. Apply 12 volts DC to EVAP canister vent control va lve. The valve will close. (Continue to apply 12 volts
until the end of test.)
3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg),
then remove pump and EVAP service port adapter.
CAUTION:
 Never 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 the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer
to EC-40, "
Description".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8.CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
 EVAP canister vent control valve is installed properly. Refer to EC-44, "
Removal and Installation".
 EVAP canister vent control valve. Refer to EC-364, "
Component Inspection".
OK or NG
OK >> GO TO 9.
NG >> Repair or replace EVAP cani ster vent control valve and O-ring.
9.CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
SEF200U
PBIB1611E
SEF200U
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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