check engine INFINITI FX35 2008 Service Manual

CO-34
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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
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OVERHEATING CAUSE ANALYSISCO-35
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Except cool-
ing system
parts mal-
function — Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for ex-
tended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow Blocked bumper —
—
Blocked radiator grille
Installed car brassiere
Mud contamination or paper
clogging
Blocked radiator —
Blocked condenser Blocked air flow
Installed large fog lamp
Symptom Check items
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ENGINE COOLANTCO-37
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ENGINE COOLANT
InspectionINFOID:0000000001325869
LEVEL CHECK
 Check if the reservoir tank engine coolant level is within the “MIN”
to “MAX” when engine is cool.
 Adjust the engine coolant level as necessary.
LEAK CHECK
 To check for leaks, apply pressure to the cooling system with radi-
ator cap tester (commercial serv ice tool) and radiator cap tester
adapter (commercial service tool) (A).
WARNING:
Do not remove radiator cap when engine is hot. Serious burns
could occur from high-pressure engine coolant escaping from
thermostat housing.
CAUTION:
Higher testing pressure than specified may cause radiator
damage.
NOTE:
In a case engine coolant decreases, r eplenish radiator with engine coolant.
 If anything is found, repair or replace damaged parts.
Changing Engine CoolantINFOID:0000000001325870
WARNING:
 To avoid being scalded, do not change engine coolant when engine is hot.
 Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressu re. Then turn radiator cap all the way.
DRAINING ENGINE COOLANT
1. Remove front engine undercover with power tool.
2. Open radiator drain plug at the bottom of radiator, and then
remove radiator cap.
When draining all of engine coolant in the system , open water drain plugs on cylinder block. Refer
to EM-242, "
Disassembly and Assembly".
3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
SMA412B
Testing pressure : 157 kPa (1.6 kg/cm2, 23 psi)
JPBIA0828ZZ
SBIA0444E
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CO-38
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ENGINE COOLANT
4. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to "FLUSHING COOLING SYSTEM".
REFILLING ENGINE COOLANT
1. Install reservoir tank, and radiator drain plug.
CAUTION:
Be sure to clean radiator drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-242, "
Dis-
assembly and Assembly".
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air relief plug on heater hose.
4. Fill thermostat housing and reservoir tank to specified level. Refill engine coolant up to fill er neck of thermostat housing.
 Pour engine coolant through engine coolant filler neck slowly of less than 2 (2-1/8 US qt, 1-3/4
Imp qt) a minute to allo w air in system to escape.
 Use Genuine NISSAN Long Life Anti freeze/Coolant or equivalent mixed with water (distilled or
demineralized). Refer to MA-9, "
Fluids and Lubricants".
 When engine coolant overflows air relief hole on heater hose, install air relief plug.
5. Install radiator cap.
6. Warm up until opening thermostat. Standard for warming- up time is approximately 10 minutes at 3,000
rpm.
 Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
7. Stop engine and cool down to less than approximately 50 °C (122 °F).
 Cool down using a fan to reduce the time.
 If necessary, refill engine coolant up to filler neck of thermostat housing. Radiator drain plug:
: 1.19 N·m (0.12 kg-m, 11 in-lb)
PBIC1530E
Engine coolant capacity
(With reservoir tank at “MAX” level):Approx. 10.0 (10-5/8 US qt, 8-3/4 Imp qt)
Reservoir tank engine coolant capacity
(At “MAX” level):0.8 (7/8 US qt, 3/4 lmp qt)
SMA412B
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ENGINE COOLANTCO-39
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8. Refill reservoir tank to “MAX” level line with engine coolant.
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.
10. Check cooling system for leaks with engine running.
11. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
 Sound may be noticeable at heater unit.
12. Repeat step 11 three times.
13. If sound is heard, bleed air from cooling system by repeating steps 4 through 7 until engine coolant level
no longer drops.
FLUSHING COOLING SYSTEM
1. Install reservoir tank, and radiator drain plug. CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block ar e removed, close and tighten them. Refer to EM-242, "
Dis-
assembly and Assembly".
2. Remove air relief plug on heater hose.
3. Fill thermostat housing with water until water spills from the air relief hole, then close air relief plug. Fill
thermostat housing and reservoir tank with water and reinstall radiator cap.
4. Run engine and warm it up to normal operating temperature.
5. Rev engine two or three times under no-load.
6. Stop engine and wait until it cools down.
7. Drain water from the system. Refer to "DRAINING ENGINE COOLANT".
8. Repeat steps 1 through 7 until clear water begins to drain from radiator. Radiator drain plug:
: 1.19 N·m (0.12 kg-m, 11 in-lb)
PBIC1530E
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CO-42
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RADIATOR
11. Lift up and remove radiator.
CAUTION:
Do not damage or scratch A/C condenser and radiator core
when removing.
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 t here is no leaks of engine coolant and A/T fluid.
Checking Radiator CapINFOID:0000000001325873
 Check valve seat of radiator cap.
- Check if valve seat is swollen to the extent that the edge of the
plunger cannot be seen when watching it vertically from the top.
- Check if valve seat has no soil and damage.
 Pull negative-pressure valve to open it, and make sure that it close
completely when released.
- Make sure that there is no dirt or damage on the valve seat of radi-
ator cap negative-pressure valve.
- Make sure that there are no unusualness in the opening and clos- ing conditions of negative-pressure valve.
 Check radiator cap relief pressure.
- When connecting radiator cap to the radiator cap tester adapter (commercial service tool) (B) and t he radiator cap tester (commer-
cial service tool) (A), apply engine c oolant to the cap seal surface.
 Replace radiator cap if there is an unusualness.
PBIC1536E
PBIC2816E
SMA967B
Standard : 78 - 98 kPa (0.8 - 1.0 kg/cm2, 11 - 14 psi)
Limit : 59 kPa (0.6 kg/cm
2, 9 psi)
PBIC5122J
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CO-50
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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
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WATER PUMPCO-51
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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
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THERMOSTAT AND WATER CONTROL VALVECO-53
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 Refer to
GI-8, "Component" for symbols in the figure.
Removal and InstallationINFOID:0000000001325885
REMOVAL
1. Drain engine coolant from drain plugs on radiat or 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 engine cover with power tool. Refer to EM-169, "
Component".
3. Remove air duct (inlet). Refer to EM-173, "
Component".
4. Disconnect water suction hose from water inlet.
5. Remove water inlet and thermostat. CAUTION:
Do not disassemble thermostat.
6. Remove intake manifolds (upper and lower). Refer to EM-175, "
Component".
7. Disconnect radiator hose (upper) and wa ter hoses from thermostat housing.
8. Disconnect heater hoses from water outlet and heater pipe.
9. Remove thermostat housing, water outlet pipe, water connector, water control valve, water outlet and heater pipe.
CAUTION:
Do not disassemble water control valve.
INSPECTION AFTER REMOVAL
 Make sure that valves both in thermostat and water c ontrol valve are completely closing at normal tempera-
ture.
 Place a thread so that it is caught in the valves of the thermostat
and water control valve. Immerse fully in a container filled with
water. Heat while stirring. (The example in the figure shows ther-
mostat.)
 The valve opening temperature is the temperature at which the valve opens and falls from the thread.
 Continue heating. Check the maximum valve lift. NOTE:
The maximum valve lift standard temperature for water control
valve is the reference value.
 After checking the maximum valve lift, lower the water tempera-
ture and check the valve closing temperature.
Standard values:
 If the malfunctioning condition, when closing valve at nor mal temperature, or measured values are out of the
standard, replace thermostat and/or water control valve.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Be careful not to spill engine coolant over en gine room. Use rag to absorb engine coolant.
Thermostat and Water Control Valve
D. To heater core E. To cylinder head (left bank) F. To cylinder head (right bank)
G. To intake manifold adapter
SLC252B
Thermostat Water control valve
Valve opening temperature 80 - 84 °C (176 - 183 °F) 93.5 - 96.5 °C (200 - 206 °F)
Maximum valve lift More than 10 mm/95
°C
(0.39 in/203 °F) More than 8 mm/108
°C
(0.315 in/226 °F)
Valve closing temperature 77 °C (171 °F) 90 °C (194 °F)
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CO-54
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THERMOSTAT AND WATER CONTROL VALVE
 Install thermostat and water control valve with the whole circumfer-
ence of each flange part fit securely inside rubber ring. (The exam-
ple in the figure shows thermostat.)
 Install thermostat with jiggle valve facing upwards. (The position deviation may be within the range of ±10 degrees)
 Install water control valve with the up-mark facing up and the frame
center part facing upwards. (The position deviation may be within
the range of ±10 degrees)
Water Outlet Pipe and Heater Pipe
First apply a neutral detergent to O-rings, then quickly insert the insertion parts of the water outlet pipe and
heater pipe into the installation holes.
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.
PBIC0157E
PBIC0158E
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