2008 INFINITI FX35 thermostat

EC-3
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Wiring Diagram ...................................................
..
195
Diagnosis Procedure .............................................195
Component Inspection ..........................................197
Removal and Installation .......................................197
DTC P0122, P0123 TP SENSOR .....................198
Component Description ....................................... ..198
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ..
198
On Board Diagnosis Logic ....................................198
DTC Confirmation Procedure ................................198
Wiring Diagram .....................................................199
Diagnosis Procedure .............................................200
Component Inspection ..........................................202
Removal and Installation .......................................203
DTC P0125 ECT SENSOR ...............................204
Component Description ....................................... ..204
On Board Diagnosis Logic ....................................204
DTC Confirmation Procedure ................................204
Diagnosis Procedure .............................................205
Component Inspection ..........................................205
Removal and Installation .......................................206
DTC P0127 IAT SENSOR ................................207
Component Description ....................................... ..207
On Board Diagnosis Logic ....................................207
DTC Confirmation Procedure ................................207
Diagnosis Procedure .............................................208
Component Inspection ..........................................208
Removal and Installation .......................................209
DTC P0128 THERMOSTAT FUNCTION ..........210
On Board Diagnosis Logic .................................. ..210
DTC Confirmation Procedure ................................210
Diagnosis Procedure .............................................210
Component Inspection ..........................................211
Removal and Installation .......................................211
DTC P0130, P0150 A/F SENSOR 1 .................212
Component Description ....................................... ..212
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ..
212
On Board Diagnosis Logic ....................................212
DTC Confirmation Procedure ................................212
Overall Function Check .........................................213
Wiring Diagram .....................................................214
Diagnosis Procedure .............................................217
Removal and Installation .......................................219
DTC P0131, P0151 A/F SENSOR 1 .................220
Component Description ....................................... ..220
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ..
220
On Board Diagnosis Logic ....................................220
DTC Confirmation Procedure ................................220
Wiring Diagram .....................................................222
Diagnosis Procedure .............................................225
Removal and Installation .......................................227
DTC P0132, P0152 A/F SENSOR 1 ................228
Component Description ....................................... ..228
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
228
On Board Diagnosis Logic .....................................228
DTC Confirmation Procedure ................................228
Wiring Diagram ......................................................230
Diagnosis Procedure .............................................233
Removal and Installation .......................................235
DTC P0133, P0153 A/F SENSOR 1 ................236
Component Description .........................................236
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
236
On Board Diagnosis Logic .....................................236
DTC Confirmation Procedure ................................236
Wiring Diagram ......................................................238
Diagnosis Procedure .............................................241
Removal and Installation .......................................244
DTC P0137, P0157 HO2S2 .............................245
Component Description .........................................245
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
245
On Board Diagnosis Logic .....................................245
DTC Confirmation Procedure ................................245
Overall Function Check .........................................246
Wiring Diagram ......................................................247
Diagnosis Procedure .............................................250
Component Inspection ...........................................252
Removal and Installation .......................................253
DTC P0138, P0158 HO2S2 .............................254
Component Description .........................................254
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
254
On Board Diagnosis Logic .....................................254
DTC Confirmation Procedure ................................255
Overall Function Check .........................................255
Wiring Diagram ......................................................257
Diagnosis Procedure .............................................260
Component Inspection ...........................................263
Removal and Installation .......................................264
DTC P0139, P0159 HO2S2 .............................265
Component Description .........................................265
CONSULT-III Reference Value in Data Monitor
Mode ......................................................................
265
On Board Diagnosis Logic .....................................265
DTC Confirmation Procedure ................................265
Overall Function Check .........................................266
Wiring Diagram ......................................................267
Diagnosis Procedure .............................................270
Component Inspection ...........................................272
Removal and Installation .......................................273
DTC P0171, P0174 FUEL INJECTION SYS-
TEM FUNCTION ..............................................
274
On Board Diagnosis Logic .....................................274
DTC Confirmation Procedure ................................274
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EC-10
DTC Confirmation Procedure ................................754
Wiring Diagram ......................................................755
Diagnosis Procedure .............................................758
Component Inspection ...........................................759
Removal and Installation .......................................760
DTC P0101 MAF SENSOR ..............................761
Component Description ....................................... ..761
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
761
On Board Diagnosis Logic .....................................761
DTC Confirmation Procedure ................................761
Overall Function Check .........................................762
Wiring Diagram ......................................................763
Diagnosis Procedure .............................................764
Component Inspection ...........................................766
Removal and Installation .......................................767
DTC P0102, P0103 MAF SENSOR .................768
Component Description ....................................... ..768
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
768
On Board Diagnosis Logic .....................................768
DTC Confirmation Procedure ................................768
Wiring Diagram ......................................................770
Diagnosis Procedure .............................................771
Component Inspection ...........................................773
Removal and Installation .......................................774
DTC P0112, P0113 IAT SENSOR ...................775
Component Description ....................................... ..775
On Board Diagnosis Logic .....................................775
DTC Confirmation Procedure ................................775
Wiring Diagram ......................................................776
Diagnosis Procedure .............................................776
Component Inspection ...........................................778
Removal and Installation .......................................778
DTC P0117, P0118 ECT SENSOR ..................779
Component Description ....................................... ..779
On Board Diagnosis Logic .....................................779
DTC Confirmation Procedure ................................780
Wiring Diagram ......................................................781
Diagnosis Procedure .............................................781
Component Inspection ...........................................783
Removal and Installation .......................................783
DTC P0122, P0123 TP SENSOR ....................784
Component Description ....................................... ..784
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ..
784
On Board Diagnosis Logic .....................................784
DTC Confirmation Procedure ................................784
Wiring Diagram ......................................................785
Diagnosis Procedure .............................................786
Component Inspection ...........................................788
Removal and Installation .......................................789
DTC P0125 ECT SENSOR ..............................790
Component Description ....................................... ..790
On Board Diagnosis Logic ................................... .790
DTC Confirmation Procedure ................................790
Diagnosis Procedure .............................................791
Component Inspection ..........................................791
Removal and Installation .......................................792
DTC P0127 IAT SENSOR ................................793
Component Description ....................................... .793
On Board Diagnosis Logic ....................................793
DTC Confirmation Procedure ................................793
Diagnosis Procedure .............................................794
Component Inspection ..........................................794
Removal and Installation .......................................795
DTC P0128 THERMOSTAT FUNCTION ..........796
On Board Diagnosis Logic ................................... .796
DTC Confirmation Procedure ................................796
Diagnosis Procedure .............................................796
Component Inspection ..........................................797
Removal and Installation .......................................797
DTC P0130, P0150 A/F SENSOR 1 .................798
Component Description ....................................... .798
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
798
On Board Diagnosis Logic ....................................798
DTC Confirmation Procedure ................................798
Overall Function Check .........................................799
Wiring Diagram .....................................................800
Diagnosis Procedure .............................................803
Removal and Installation .......................................805
DTC P0131, P0151 A/F SENSOR 1 .................806
Component Description ....................................... .806
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
806
On Board Diagnosis Logic ....................................806
DTC Confirmation Procedure ................................806
Wiring Diagram .....................................................808
Diagnosis Procedure .............................................811
Removal and Installation .......................................813
DTC P0132, P0152 A/F SENSOR 1 .................814
Component Description ....................................... .814
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
814
On Board Diagnosis Logic ....................................814
DTC Confirmation Procedure ................................814
Wiring Diagram .....................................................816
Diagnosis Procedure .............................................819
Removal and Installation .......................................821
DTC P0133, P0153 A/F SENSOR 1 .................822
Component Description ....................................... .822
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................
822
On Board Diagnosis Logic ....................................822
DTC Confirmation Procedure ................................822
Wiring Diagram .....................................................824
Diagnosis Procedure .............................................827
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EC-94
< SERVICE INFORMATION >[VQ35DE]
TROUBLE DIAGNOSIS

If DTC U1000 or U1001 is displayed with other DT C, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-146
.
 If DTC U1010 is displayed with other DTC, fi rst perform the trouble diagnosis for DTC U1010.
Refer to EC-148
.
*: Models with ICC.Priority Detected items (DTC)
1  U1000 U1001 CAN communication line  U1010 CAN communication
 P0101 P0102 P0103 Mass air flow sensor
 P0112 P0113 P0127 Intake air temperature sensor
 P0117 P0118 P0125 Engine coolant temperature sensor
 P0128 Thermostat function
 P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
 P0181 P0182 P0183 Fuel tank temperature sensor
 P0327 P0328 Knock sensor
 P0335 Crankshaft position sensor (POS)
 P0340 P0345 Camshaft position sensor (PHASE)
 P0460 P0461 P0462 P0463 Fuel level sensor
 P0500 Vehicle speed sensor
 P0605 ECM
 P0643 Sensor power supply
 P0700 TCM
 P0705 Park/neutral position (PNP) switch
 P0850 Park/neutral position (PNP) switch
 P1610 - P1615 NATS
 P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
2  P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater  P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
 P0075 P0081 Intake valve timing control solenoid valve
 P0130 P0131 P0132 P0133 P0150 P0151 P0152 P0153 P2A00 P2A03 Air fuel ratio (A/F) sensor 1
 P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
 P0441 EVAP control system purge flow monitoring
 P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
 P0447 P0448 EVAP canister vent control valve
 P0451 P0452 P0453 EVAP control system pressure sensor
 P0550 Power steering pressure sensor
 P0603 ECM power supply
 P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1757 P1762 P1767
P1772 P1774 A/T related sensors, solenoid valves and switches
 P1217 Engine over temperature (OVERHEAT)
 P1805 Brake switch
 P2100 P2103 P2118 Electric throttle control actuator
 P2101 Electric throttle control function
3  P0011 P0021 Intake valve timing control  P0171 P0172 P0174 P0175 Fuel injection system function
 P0300 - P0306 Misfire
 P0420 P0430 Three way catalyst function
 P0442 EVAP control system (SMALL LEAK)
 P0455 EVAP control system (GROSS LEAK)
 P0456 EVAP control sys tem (VERY SMALL LEAK)
 P0506 P0507 Idle speed control system
 P1148 P1168 Closed loop control
 P1211 TCS control unit
 P1212 TCS communication line
 P1421 COLD START CONTROL
 P1564 ICC steering switch/ASCD steering switch
 P1568 ICC command valve*
 P1572 ICC brake switch/ASCD brake switch
 P1574 ICC vehicle speed sensor/ASCD vehicle speed sensor
 P1715 Turbine revolution sensor
 P2119 Electric throttle control actuator
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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
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EC-204
< SERVICE INFORMATION >[VQ35DE]
DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component DescriptionINFOID:0000000001326028
NOTE:
If DTC P0125 is displayed with P0117 or P0118, fi
rst perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-193
.
The engine coolant temperature (ECT) 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 sens or uses a thermistor which is
sensitive to the change in temperat ure. The electrical resistance of
the thermistor decreases as temperature increases.

*: This data is reference values and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring in put/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground.
On Board Diagnosis LogicINFOID:0000000001326029
DTC Confirmation ProcedureINFOID:0000000001326030
CAUTION:
Be careful not to overheat engine.
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check that “COOLAN TEMP/S” is above 10 °C (50 °F).
If it is above 10 °C (50 °F), the test result will be OK.
If it is below 10 °C (50 °F), go to following step.
4. Start engine and run it for 65 minutes at idle speed.
SEF594K
Engine coolant
temperature °C ( °F) Voltage* V Resistance k
Ω
-10 (14) 4.4 7.0 - 11.4s 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
0125 Insufficient 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
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DTC P0125 ECT SENSOREC-205
< SERVICE INFORMATION > [VQ35DE]
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If “COOLAN TEMP/S” increases to more than 10
°C (50 °F) within 65 minutes, stop engine because
the test result will be OK.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-205, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis ProcedureINFOID:0000000001326031
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body. Refer to EC-144, "
Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-205, "
Component Inspection".
OK or NG
OK >> GO TO 3.
NG >> Replace engine coolant temperature sensor.
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-27
.
4.CHECK INTERMITTENT INCIDENT
Refer to EC-139
.
Refer to EC-195, "
Wiring Diagram".
>> INSPECTION END
Component InspectionINFOID:0000000001326032
ENGINE COOLANT TEMPERATURE SENSOR
PBIB2625E
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EC-210
< SERVICE INFORMATION >[VQ35DE]
DTC P0128 THERMOSTAT FUNCTION
DTC P0128 THERMOSTAT FUNCTION
On Board Diagn
osis LogicINFOID:0000000001326040
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 ProcedureINFOID:0000000001612840
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, 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 en gine coolant temperature of –10 °C (14 °F) to 71 °C (160 °F).
 Before performing the following procedure, do not fill with the fuel.
WITH CONSULT-III
1. Turn A/C switch OFF.
2. Turn blower fan switch OFF.
3. Turn ignition switch ON.
4. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.
5. Check the indication of “COOLAN TEMP/S”.
If it is below 71 °C (160 °F), go to following step.
If it is above 71 °C (160 °F), cool down the engine to less than 71 °C (160 °F), then go to next step.
6. Start engine.
7. Wait at idle for a least 30 minutes. If “COOLAN TEMP/S” increases to more than 71 °C (160 °F) within 30 minutes, turn ignition switch
OFF because the test result will be OK.
8. Check 1st trip DTC.
9. If 1st trip DTC is detected, go to EC-210, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis ProcedureINFOID:0000000001612841
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-211, "
Component Inspection".
OK or NG
OK >> GO TO 2.
NG >> Replace engine coolant temperature sensor.
2.CHECK THERMOSTAT
Refer to CO-27, "
Removal and Installation".
OK or NG
OK >> INSPECTION END
NG >> Replace thermostat.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0128
0128 Thermostat function The engine coolant temperature does not reach
to specified temperature even though the en-
gine has run long enough. Thermostat
 Leakage from sealing portion of thermo-
stat
 Engine coolant temperature sensor
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DTC P0128 THERMOSTAT FUNCTIONEC-211
< SERVICE INFORMATION > [VQ35DE]
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Component InspectionINFOID:0000000001326043
ENGINE COOLANT TEMPERATURE SENSOR
Check resistance between engine cool
ant temperature sensor termi-
nals 1 and 2 as shown in the figure.

If NG, replace engine coolant temperature sensor.
Removal and InstallationINFOID:0000000001326044
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-27.
PBIB2005E
Engine coolant temperature °C ( °F) Resistance k Ω
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
SEF012P
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