Thermostat INFINITI FX35 2004 Owner's Guide

DTC P0125 ECT SENSOR
EC-855
[VK45DE]
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Revision: 2004 November 2004 FX35/FX45
DTC P0125 ECT SENSORPFP:22630
Component DescriptionABS00C26
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-842
.
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: These data are reference values and are measured between ECM terminal 73
(Engine coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicABS00C27
This self-diagnosis has the one trip detection logic.
SEF594K
Engine coolant
temperature°C (°F)Voltage* V Resistance kΩ
-10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0125
0125Insufficient engine cool-
ant temperature for
closed loop fuel control

Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.

Engine coolant temperature is insufficient for
closed loop fuel control.

Harness or connectors
(High resistance in the circuit)

Engine coolant temperature sensor

Thermostat

DTC P0125 ECT SENSOR
EC-857
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Revision: 2004 November 2004 FX35/FX45
3. CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine
coolant does not flow.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace thermostat. Refer to CO-51, "
THERMOSTAT AND WATER CONTROL VALVE" .
4. CHECK INTERMITTENT INCIDENT
Refer to EC-784, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionABS00C2A
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

*: These data are reference values and are measured between ECM terminal
73 (Engine coolant temperature sensor) and ground.
2. If NG, replace engine coolant temperature sensor.
Removal and InstallationABS00C2B
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-51, "THERMOSTAT AND WATER CONTROL VALVE" .
PBIB2005E
Engine coolant
temperature°C (°F)Voltage* V Resistance kΩ
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P

DTC P0128 THERMOSTAT FUNCTION
EC-861
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Revision: 2004 November 2004 FX35/FX45
DTC P0128 THERMOSTAT FUNCTIONPFP:21200
On Board Diagnosis LogicABS00C2I
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.
DTC Confirmation ProcedureABS00C2J
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:

For best results, perform at ambient temperature of –10°C (14°F) or higher.

For best results, perform at engine coolant temperature of –10°C (14°F) to 60°C (140°F).
WITH CONSULT-II
1. Replace thermostat with new one. Refer to CO-51, "THERMOSTAT AND WATER CONTROL VALVE" .
Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may
come on.
2. Turn ignition switch ON.
3. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-II.
4. Check that the “COOLAN TEMP/S” is above 60°C (140°F).
If it is below 60°C (140°F), go to following step.
If it is above 60°C (140°F), cool down the engine to less than 60°C (140°F), then retry from step 1.
5. Drive vehicle for 10 consecutive minutes under the following conditions.
If 1st trip DTC is detected, go to EC-861, "
Diagnostic Procedure" .
WITH GST
1. Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureABS00C2K
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-862, "
Component Inspection" .
OK or NG
OK >>INSPECTION END
NG >> Replace engine coolant temperature sensor.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0128
0128Thermostat functionThe engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.

Thermostat

Leakage from sealing portion of thermo-
stat

Engine coolant temperature sensor
VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH)

EC-862
[VK45DE]
DTC P0128 THERMOSTAT FUNCTION
Revision: 2004 November 2004 FX35/FX45
Component InspectionABS00C2L
ENGINE COOLANT TEMPERATURE SENSOR
Check resistance as shown in the figure.

If NG, replace engine coolant temperature sensor.
Removal and InstallationABS00C2M
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-51, "THERMOSTAT AND WATER CONTROL VALVE" .
PBIB2005E
Temperature °C (°F) Resistance kΩ
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.0
90 (194) 0.236 - 0.260
SEF012P

DTC P1217 ENGINE OVER TEMPERATURE
EC-1143
[VK45DE]
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Revision: 2004 November 2004 FX35/FX45
COMPONENT DESCRIPTION
The cooling fan at each speed when the current flows in the cooling fan motor as follows.
CONSULT-II Reference Value in Data Monitor ModeABS00CAR
Specification data are reference values.
On Board Diagnosis LogicABS00CAS
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
This self-diagnosis has the one trip detection logic.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant. Refer to CO-36, "
Changing Engine
Coolant" . Also, replace the engine oil. Refer to LU-26, "Changing Engine Oil" .
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to
use coolant with the proper mixture ratio. Refer to MA-13, "
Anti-Freeze Coolant Mixture Ratio" .
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
Overall Function CheckABS00CAT
Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.
Cooling fan speedCooling fan motor terminals
(+) (−)
High (HI) 1 and 2 3 and 4
MONITOR ITEM CONDITION SPECIFICATION
COOLING FAN

Engine: After warming up, idle
the engine

Air conditioner switch: OFFEngine coolant temperature is 94°C
(201°F) or lessOFF
Engine coolant temperature is 95°C
(203°F) or moreHI
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1217
1217Engine over tempera-
ture (Overheat)

Cooling fan does not operate properly (Over-
heat).

Cooling fan system does not operate prop-
erly (Overheat).

Engine coolant was not added to the system
using the proper filling method.

Engine coolant is not within the specified
range.

Harness or connectors
(The cooling fan circuit is open or
shorted.)

Cooling fan

Radiator hose

Radiator

Radiator cap

Water pump

Thermostat
For more information, refer to EC-1150,
"Main 12 Causes of Overheating" .

EC-1148
[VK45DE]
DTC P1217 ENGINE OVER TEMPERATURE
Revision: 2004 November 2004 FX35/FX45
4. CHECK COOLING SYSTEM FOR LEAK
Apply pressure to the cooling system with a tester, and check if the
pressure drops.
CAUTION:
Higher than the specified pressure may cause radiator damage.
Pressure should not drop.
OK or NG
OK >> GO TO 5.
NG >> Check the following for leak. Refer to CO-36, "
LEAK
CHECK" .

Hose

Radiator

Water pump
5. CHECK RADIATOR CAP
Apply pressure to cap with a tester.
OK or NG
OK >> GO TO 6.
NG >> Replace radiator cap.
6. CHECK THERMOSTAT
1. Check valve seating condition at normal room temperatures.
It should seat tightly.
2. Check valve opening temperature and valve lift.
3. Check if valve is closed at 5°C (9°F) below valve opening tem-
perature.
For details, refer to CO-51, "
THERMOSTAT AND WATER CON-
TROL VALVE" .
OK or NG
OK >> GO TO 7.
NG >> Replace thermostat
7. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-846, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace engine coolant temperature sensor.Testing pressure: 157 kPa (1.6 kg/cm
2 , 23 psi)
PBIC1528E
Radiator cap
relief pressure:59 - 98 kPa (0.6 - 1.0 kg/cm2 , 9 - 14
psi)
SLC755A
Valve opening
temperature:82°C (180°F) [standard]
Valve lift: More than 10.0 mm/95°C
(0.394 in/203°F)
SLC343

EC-1150
[VK45DE]
DTC P1217 ENGINE OVER TEMPERATURE
Revision: 2004 November 2004 FX35/FX45
4. CHECK COOLING FAN MOTOR GROUND CIRCUIT FOR OPEN OR SHORT
1. Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to wiring diagram.
2. Also check harness for short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to power in harness or connectors.
5. CHECK COOLING FAN MOTOR
Refer to EC-1151, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace cooling fan motor.
6. CHECK INTERMITTENT INCIDENT
Perform EC-784, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R. Refer to PG-18, "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MOD-
ULE ENGINE ROOM)" .
NG >> Repair or replace harness connectors.
Main 12 Causes of OverheatingABS00CAW
Continuity should exist.
Engine Step Inspection item Equipment Standard Reference page
OFF 1

Blocked radiator

Blocked condenser

Blocked radiator grille

Blocked bumper

Visual No blocking —
2

Coolant mixture
Coolant tester 50 - 50% coolant mixtureMA-13
3
Coolant level
Visual Coolant up to MAX level
in reservoir tank and radi-
ator filler neckCO-36
4
Radiator cap
Pressure tester 59 - 98 kPa
(0.6 - 1.0 kg/cm2 , 9 - 14
psi) (Limit)CO-41
ON*25
Coolant leaks
Visual No leaksCO-36
ON*26
Thermostat
Touch the upper and
lower radiator hosesBoth hoses should be hotCO-51
ON*17
Cooling fan
CONSULT-II Operating See trouble diagnosis for
DTC P1217 (EC-1142
).
OFF 8

Combustion gas leak
Color checker chemical
tester 4 Gas analyzerNegative —
ON*
39
Coolant temperature
gauge
Visual Gauge less than 3/4
when driving—

Coolant overflow to
reservoir tank
Visual No overflow during driving
and idlingCO-36
OFF*410
Coolant return from
reservoir tank to radia-
tor
Visual Should be initial level in
reservoir tankCO-36

EM-100
[VQ35DE]
CYLINDER HEAD
Revision: 2004 November 2004 FX35/FX45
NOTE:
At the time of the start of this procedure front suspension member is removed, and cylinder head is
hanged by hoist with engine slinger installed.
3. Release hoist from hanging, then remove engine slinger.
4. Remove the following components and related parts:

Fuel tube and fuel injector assembly. Refer to EM-45, "FUEL INJECTOR AND FUEL TUBE" .

Intake manifold. Refer to EM-24, "INTAKE MANIFOLD" .

Exhaust manifold. Refer to EM-26, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

Water inlet and thermostat assembly. Refer to CO-26, "WATER INLET AND THERMOSTAT ASSEM-
BLY" .

Water outlet and water piping. Refer to CO-28, "WATER OUTLET AND WATER PIPING" .
5. Remove cylinder head loosening bolts with power tool in reverse
order shown in the figure and using cylinder head bolt wrench
(commercial service tool).
6. Remove cylinder head gaskets.
INSPECTION AFTER REMOVAL
Outer Diameter of Cylinder Head Bolts

Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between d1 and d2
exceeds the limit, replace them with new one.

If reduction of outer diameter appears in a position other than
d2, use it as d2 point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-139, "
CYLIN-
DER BLOCK DISTORTION" .
1. Using scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Do not allow gasket fragments to enter engine oil or engine coolant passages.
PBIC2057E
Limit (d1 - d2) : 0.11 mm (0.0043 in)
SEM957E

TIMING CHAIN
EM-197
[VK45DE]
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Revision: 2004 November 2004 FX35/FX45
REMOVAL
1. Remove engine assembly from vehicle. Refer to EM-236, "ENGINE ASSEMBLY" .
2. Remove the following components and related parts:

Drive belt auto tensioner and idler pulley; Refer to EM-171, "Drive Belt Auto Tensioner and Idler Pulley"
.

Thermostat housing and hoses; Refer to CO-51, "THERMOSTAT AND WATER CONTROL VALVE" .

Ignition coil; Refer to EM-185, "IGNITION COIL" .

Rocker cover; Refer to EM-193, "ROCKER COVER" .
3. If necessary, remove intake valve timing control position sensor
(right and left bank) and camshaft position sensor (PHASE) from
intake valve timing control cover and front cover.
CAUTION:

Handle carefully to avoid dropping and shocks.

Do not disassemble.
4. If necessary, remove intake valve timing control solenoid valve from intake valve timing control cover.
CAUTION:

Handle components and parts carefully to avoid dropping and shocks.

Do not disassemble.

Do not allow metal powder to adhere to magnetic part at sensor tip.

Do not place sensors in a location where they are exposed to magnetism.
1. Camshaft sprocket (EXH) 2. Camshaft sprocket (INT) 3. Camshaft sprocket (INT)
4. Camshaft sprocket (EXH) 5. Front cover 6.Intake valve timing control solenoid
valve (right bank)
7. O-ring 8. Seal ring 9.Intake valve timing control position
sensor (right bank)
10. O-ring 11.Intake valve timing control cover
(right bank)12.Intake valve timing control position
sensor (left bank)
13. O-ring 14.Intake valve timing control cover (left
bank)15. Seal ring
16.Intake valve timing control solenoid
valve (left bank)17. O-ring 18. Oil level gauge
19. Oil level gauge guide 20. O-ring 21. Crankshaft pulley bolt
22. Crankshaft pulley 23. Front oil seal 24. Chain tensioner cover
25. Camshaft position sensor (PHASE) 26. O-ring 27. Oil pump drive spacer
28. Oil pump assembly 29. Crankshaft sprocket 30. O-ring
31. O-ring 32.Timing chain tension guide
(right bank)33.Timing chain slack guide
(right bank)
34. Timing chain (right bank) 35. Timing chain (left bank) 36. Chain tensioner (left bank)
37. Chain tensioner (right bank) 38.Timing chain slack guide
(left bank)39.Timing chain tension guide
(left bank)
40. O-ring
PBIC0050E

IDX-7
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IDX
ALPHABETICAL INDEX
Propeller shaft ..................................................... PR-6
Propeller shaft on vehicle service ........................ PR-6
Propeller shaft vibration ....................................... PR-6
PS/SEN - Wiring diagram ................ EC-397, EC-1053
R
R/VIEW - Wiring diagram ................................... DI-84
Radiator(VK45DE) ............................................. CO-39
Radiator(VQ35DE) ............................................ CO-14
Rear axle ........................................................... RAX-5
Rear bumper ........................................................ EI-18
Rear combination lamp removal and installation ..........
LT-147
Rear door ............................................ BL-148, GW-80
Rear seat ......................................................... SE-107
Rear suspension ............................................... RSU-5
Rear view monitor ............................................... DI-81
Rear washer .................................................... WW-35
Rear window defogger ...................................... GW-86
Rear wiper ....................................................... WW-35
Refrigerant connection precaution ..................... ATC-8
Refrigerant discharging evacuating charging ATC-137
Refrigerant general precaution .......................... ATC-7
Refrigerant lines ............................................ ATC-137
Refrigerant pressure sensor ........... EC-609, EC-1287,
ATC-90
, ATC-155
Refrigeration cycle ........................................... ATC-21
Removal and installation (A/T) ........... AT-266, AT-269
Removal and installation (Transfer) .................... TF-43
Revolution sensor (A/T) ...................... AT-116, AT-260
Ring gear diff. inspection ................................. RFD-13
Rocker cover(VK45DE) ................................... EM-193
Rocker cover(VQ35DE) ..................................... EM-51
Room lamp - See Interior lamp ......................... LT-157
ROOM/L - Wiring diagram ................................ LT-164
RP/SEN - Wiring diagram ................ EC-610, EC-1288
S
Seal - See Exterior .............................................. EI-28
SEAT - Wiring diagram ...................................... SE-95
Seat belt inspection ............................................. SB-8
Seat belt pre-tensioner disposal ...................... SRS-49
Seat belt, front ..................................................... SB-4
Seat, rear ......................................................... SE-107
Self-diagnosis (Transfer) .................................... TF-21
SEN/PW - Wiring diagram ............... EC-490, EC-1157
SHIFT - Wiring diagram ................................... AT-236
Shift change signal ........................................ EC-1218
Shift lock system .............................................. AT-235
Shift schedule .................................................. AT-348
Shock absorber (rear) ....................................... RSU-9
Side air bag (satellite) sensor .......................... SRS-46
Side bearing preload diff. ................................. RFD-20
Side curtain air bag .......................................... SRS-43
Side flange installation diff. .............................. RFD-10
Side trim .............................................................. EI-37
SMJ (super multiple junction) ............................ PG-79
Spark plug replacement .................................... MA-26
Spark plug replacement(VQ35DE) ................... MA-19
Spark plug(VK45DE) ...................................... EM-186
Spark plug(VQ35DE) ........................................ EM-43
Specification value ............................. EC-131, EC-780
Speedometer ........................................................ DI-4
Spiral cable ..................................................... SRS-38
Spot lamp .......................................................... LT-184
SROOF - Wiring diagram ..................... BL-167, RF-14
SRS - See Supplemental Restraint System ..... SRS-5
SRS Trouble diagnoses .................................... SRS-7
Stabilizer bar (rear) ......................................... RSU-16
Stall test (A/T) .................................................... AT-51
Standardized relay ............................................. PG-81
START - Wiring diagram .................................... SC-11
Starter ................................................................ SC-10
Starting system .................................................. SC-10
Steering gear and linkage inspection ................ MA-35
Steering linkage ................................................. PS-19
Steering wheel and column ................... PS-10, PS-12
Steering wheel turning force .............................. PS-10
Step lamp .......................................................... LT-124
Stop lamp .......................................................... LT-116
Stop lamp switch .............................. EC-550, EC-1220
STOP/L - Wiring diagram .................................. LT-118
Sun roof, electric ................................................ RF-10
Sunload sensor ............................. ATC-110, ATC-119
Sunroof .................................................. RF-10, RF-25
Supplemental Restraint System ....................... SRS-5
Suspension ....................................................... MA-36
Symbols and abbreviations ...................... GI-10, GI-23
T
Tachometer ........................................................... DI-4
TCM circuit diagram ........................................... AT-50
TCM inspection table ......................................... AT-90
Thermostat(VK45DE) ....................................... CO-51
Thermostat(VQ35DE) ....................................... CO-26
Three way catalyst function (Bank 1) . EC-316, EC-971
Three way catalyst function (Bank 2) . EC-316, EC-971
Three way catalyst precautions ............................ GI-6
Three way catalyst(VK45DE) .......................... EM-178
Three way catalyst(VQ35DE) ........................... EM-26
Throttle control motor ....................... EC-428, EC-1090
Throttle control motor relay .............. EC-423, EC-1085
Throttle position sensor (TPS) .......... EC-190, EC-284,
EC-485
, EC-487, EC-569, EC-848, EC-942, EC-1152,
EC-1154
, EC-1239
Tie-rod ............................................................... PS-19
Timing chain(VK45DE) ................................... EM-196
Timing chain(VQ35DE) ..................................... EM-63
Tire rotation ............................................. WT-6, MA-34
Tooth contact diff. ........................................... RFD-24
Top tether strap child restraint ........................... SB-12
Torque converter installation AT-267, AT-268, AT-272
Torque convertor clutch solenoid valve AT-123, AT-125
TPS1 - Wiring diagram ...................... EC-286, EC-944
TPS2 - Wiring diagram ...................... EC-192, EC-850