2005 INFINITI FX35 thermostat

EC-2Revision: 2005 July 2005 FX
Inspection Procedure ...........................................
.153
Diagnostic Procedure .......................................... .154
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT ...................................................................... .163
Description ........................................................... .163
Diagnostic Procedure .......................................... .163
POWER SUPPLY AND GROUND CIRCUIT .......... .164
Wiring Diagram .................................................... .164
Diagnostic Procedure .......................................... .165
Ground Inspection ............................................... .170
DTC U1000, U1001 CAN COMMUNICATION LINE .171
Description ........................................................... .171
On Board Diagnosis Logic ................................... .171
DTC Confirmation Procedure .............................. .171
Wiring Diagram .................................................... .172
Diagnostic Procedure .......................................... .173
DTC P0011, P0021 IVT CONTROL ....................... .174
Description ........................................................... .174
CONSULT-II Reference Value in Data Monitor Mode .174
On Board Diagnosis Logic ................................... .175
DTC Confirmation Procedure .............................. .175
Diagnostic Procedure .......................................... .176
Component Inspection ......................................... .177
Removal and Installation ..................................... .177
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER .178
Description ........................................................... .178
CONSULT-II Reference Value in Data Monitor Mode .178
On Board Diagnosis Logic ................................... .178
DTC Confirmation Procedure .............................. .179
Wiring Diagram .................................................... .180
Diagnostic Procedure .......................................... .183
Component Inspection ......................................... .185
Removal and Installation ..................................... .185
DTC P0101 MAF SENSOR .................................... .186
Component Description ....................................... .186
CONSULT-II Reference Value in Data Monitor Mode .186
On Board Diagnosis Logic ................................... .186
DTC Confirmation Procedure .............................. .187
Overall Function Check ....................................... .188
Wiring Diagram .................................................... .189
Diagnostic Procedure .......................................... .190
Component Inspection ......................................... .193
Removal and Installation ..................................... .194
DTC P0102, P0103 MAF SENSOR ........................ .195
Component Description ....................................... .195
CONSULT-II Reference Value in Data Monitor Mode .195
On Board Diagnosis Logic ................................... .195
DTC Confirmation Procedure .............................. .196
Wiring Diagram .................................................... .197
Diagnostic Procedure .......................................... .198
Component Inspection ......................................... .201
Removal and Installation ..................................... .202
DTC P0112, P0113 IAT SENSOR .......................... .203
Component Description ....................................... .203
On Board Diagnosis Logic ................................... .203 DTC Confirmation Procedure ...............................
.203
Wiring Diagram .................................................... .205
Diagnostic Procedure ........................................... .206
Component Inspection ......................................... .207
Removal and Installation ...................................... .207
DTC P0117, P0118 ECT SENSOR ......................... .208
Component Description ....................................... .208
On Board Diagnosis Logic ................................... .208
DTC Confirmation Procedure ............................... .209
Wiring Diagram .................................................... .210
Diagnostic Procedure ........................................... .211
Component Inspection ......................................... .212
Removal and Installation ...................................... .212
DTC P0122, P0123 TP SENSOR ........................... .213
Component Description ....................................... .213
CONSULT-II Reference Value in Data Monitor Mode .213
On Board Diagnosis Logic ................................... .213
DTC Confirmation Procedure ............................... .214
Wiring Diagram .................................................... .215
Diagnostic Procedure ........................................... .216
Component Inspection ......................................... .219
Removal and Installation ...................................... .219
DTC P0125 ECT SENSOR ..................................... .220
Component Description ....................................... .220
On Board Diagnosis Logic ................................... .220
DTC Confirmation Procedure ............................... .221
Diagnostic Procedure ........................................... .221
Component Inspection ......................................... .222
Removal and Installation ...................................... .222
DTC P0127 IAT SENSOR ....................................... .223
Component Description ....................................... .223
On Board Diagnosis Logic ................................... .223
DTC Confirmation Procedure ............................... .223
Diagnostic Procedure ........................................... .224
Component Inspection ......................................... .225
Removal and Installation ...................................... .225
DTC P0128 THERMOSTAT FUNCTION ................ .226
On Board Diagnosis Logic ................................... .226
DTC Confirmation Procedure ............................... .226
Diagnostic Procedure ........................................... .226
Component Inspection ......................................... .227
Removal and Installation ...................................... .227
DTC P0138, P0158 HO2S2 .................................... .228
Component Description ....................................... .228
CONSULT-II Reference Value in Data Monitor Mode .228
On Board Diagnosis Logic ................................... .228
DTC Confirmation Procedure ............................... .229
Wiring Diagram .................................................... .230
Diagnostic Procedure ........................................... .233
Component Inspection ......................................... .235
Removal and Installation ...................................... .236
DTC P0139, P0159 HO2S2 .................................... .237
Component Description ....................................... .237
CONSULT-II Reference Value in Data Monitor Mode .237
On Board Diagnosis Logic ................................... .237
DTC Confirmation Procedure ............................... .238

EC-9
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. 885
On Board Diagnosis Logic .................................. . 885
DTC Confirmation Procedure .............................. . 886
Wiring Diagram ................................................... . 887
Diagnostic Procedure .......................................... . 890
Component Inspection ........................................ . 892
Removal and Installation ..................................... . 892
DTC P0101 MAF SENSOR ................................... . 893
Component Description ....................................... . 893
CONSULT-II Reference Value in Data Monitor Mode . 893
On Board Diagnosis Logic .................................. . 893
DTC Confirmation Procedure .............................. . 894
Overall Function Check ....................................... . 895
Wiring Diagram ................................................... . 896
Diagnostic Procedure .......................................... . 897
Component Inspection ........................................ . 900
Removal and Installation ..................................... . 901
DTC P0102, P0103 MAF SENSOR ....................... . 902
Component Description ....................................... . 902
CONSULT-II Reference Value in Data Monitor Mode . 902
On Board Diagnosis Logic .................................. . 902
DTC Confirmation Procedure .............................. . 903
Wiring Diagram ................................................... . 904
Diagnostic Procedure .......................................... . 905
Component Inspection ........................................ . 907
Removal and Installation ..................................... . 908
DTC P0112, P0113 IAT SENSOR .......................... . 909
Component Description ....................................... . 909
On Board Diagnosis Logic .................................. . 909
DTC Confirmation Procedure .............................. . 909
Wiring Diagram ................................................... .. 911
Diagnostic Procedure .......................................... . 912
Component Inspection ........................................ . 913
Removal and Installation ..................................... . 913
DTC P0117, P0118 ECT SENSOR ........................ . 914
Component Description ....................................... . 914
On Board Diagnosis Logic .................................. . 914
DTC Confirmation Procedure .............................. . 915
Wiring Diagram ................................................... . 916
Diagnostic Procedure .......................................... . 917
Component Inspection ........................................ . 919
Removal and Installation ..................................... . 919
DTC P0122, P0123 TP SENSOR .......................... . 920
Component Description ....................................... . 920
CONSULT-II Reference Value in Data Monitor Mode . 920
On Board Diagnosis Logic .................................. . 920
DTC Confirmation Procedure .............................. . 921
Wiring Diagram ................................................... . 922
Diagnostic Procedure .......................................... . 923
Component Inspection ........................................ . 926
Removal and Installation ..................................... . 926
DTC P0125 ECT SENSOR .................................... . 927
Component Description ....................................... . 927
On Board Diagnosis Logic .................................. . 927
DTC Confirmation Procedure .............................. . 928
Diagnostic Procedure .......................................... . 928 Component Inspection .........................................
.929
Removal and Installation ..................................... .929
DTC P0127 IAT SENSOR ...................................... .930
Component Description ....................................... .930
On Board Diagnosis Logic ................................... .930
DTC Confirmation Procedure .............................. .930
Diagnostic Procedure .......................................... .931
Component Inspection ......................................... .932
Removal and Installation ..................................... .932
DTC P0128 THERMOSTAT FUNCTION ................ .933
On Board Diagnosis Logic ................................... .933
DTC Confirmation Procedure .............................. .933
Diagnostic Procedure .......................................... .933
Component Inspection ......................................... .934
Removal and Installation ..................................... .934
DTC P0132, P0152 HO2S1 .................................... .935
Component Description ....................................... .935
CONSULT-II Reference Value in Data Monitor Mode .935
On Board Diagnosis Logic ................................... .935
DTC Confirmation Procedure .............................. .936
Wiring Diagram .................................................... .937
Diagnostic Procedure .......................................... .940
Component Inspection ......................................... .942
Removal and Installation ..................................... .943
DTC P0133, P0153 HO2S1 .................................... .944
Component Description ....................................... .944
CONSULT-II Reference Value in Data Monitor Mode .944
On Board Diagnosis Logic ................................... .944
DTC Confirmation Procedure .............................. .945
Overall Function Check ....................................... .946
Wiring Diagram .................................................... .947
Diagnostic Procedure .......................................... .950
Component Inspection ......................................... .954
Removal and Installation ..................................... .955
DTC P0134, P0154 HO2S1 .................................... .956
Component Description ....................................... .956
CONSULT-II Reference Value in Data Monitor Mode .956
On Board Diagnosis Logic ................................... .956
DTC Confirmation Procedure .............................. .957
Overall Function Check ....................................... .958
Wiring Diagram .................................................... .959
Diagnostic Procedure .......................................... .962
Component Inspection ......................................... .964
Removal and Installation ..................................... .965
DTC P0138, P0158 HO2S2 .................................... .966
Component Description ....................................... .966
CONSULT-II Reference Value in Data Monitor Mode .966
On Board Diagnosis Logic ................................... .966
DTC Confirmation Procedure .............................. .967
Wiring Diagram .................................................... .968
Diagnostic Procedure .......................................... .971
Component Inspection ......................................... .973
Removal and Installation ..................................... .974
DTC P0139, P0159 HO2S2 .................................... .975
Component Description ....................................... .975

TROUBLE DIAGNOSIS EC-107
[VQ35DE]
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Revision: 2005 July 2005 FX
DTC Inspection Priority ChartABS006KP
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-171
.
Priority Detected items (DTC)
1

U1000 U1001 CAN communication line

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

P0700 TCM

P0705 Park/Neutral position (PNP) switch

P1229 Sensor power supply

P1610 - P1615 NATS

P1706 Park/Neutral position (PNP) switch

P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

TROUBLE DIAGNOSIS EC-113
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Revision: 2005 July 2005 FX
1 - 6: The numbers refer to the order of inspection. Va l v e
mecha-
nism Timing chain
55555 55 5 EM-64
Camshaft
EM-84
Intake valve timing controlEM-64
Intake valve
3 EM-100
Exhaust valve
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-
17 , LU-10 ,
LU-14
Oil level (Low)/Filthy oil LU-7
Cooling
Radiator/Hose/Radiator filler cap
55555 55 45 CO-14,
CO-17
Thermostat 5 CO-26
Water pumpCO-22
Water galleryCO-28
Cooling fan 5EC-226
Coolant level (Low)/Contami-
nated coolant 5
CO-11
IVIS (Infiniti Vehicle Immobilizer System —
NATS) 11
EC-53 or
BL-213
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

EC-212
[VQ35DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2005 July 2005 FX
3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-212, "
Component Inspection" .
OK or NG
OK >> GO TO 5.
NG >> Replace engine coolant temperature sensor.
5. CHECK INTERMITTENT INCIDENT
Refer to EC-163, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component InspectionABS006MS
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.
Removal and InstallationABS006MT
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-26, "WATER INLET AND THERMOSTAT ASSEMBLY" .
Continuity should exist.
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

EC-220
[VQ35DE]
DTC P0125 ECT SENSOR
Revision: 2005 July 2005 FX
DTC P0125 ECT SENSORPFP:22630
Component DescriptionABS006NA
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-208
.
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.

*: This data is reference value and is 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 damage to the ECM's transistor. Use a ground other than ECM termi-
nals, such as the ground.
On Board Diagnosis LogicABS006NB
This self-diagnosis has the one trip detection logic.
SEF594K
Engine coolant
temperature °C ( °F) Voltage* V Resistance k
Ω
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

EC-222
[VQ35DE]
DTC P0125 ECT SENSOR
Revision: 2005 July 2005 FX
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-26, "
WATER INLET AND THERMOSTAT ASSEMBLY"
.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-163, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
Refer to EC-210, "
Wiring Diagram" .
>> INSPECTION END
Component InspectionABS006NE
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.
Removal and InstallationABS006NF
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-26, "WATER INLET AND THERMOSTAT ASSEMBLY" .
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

EC-226
[VQ35DE]
DTC P0128 THERMOSTAT FUNCTION
Revision: 2005 July 2005 FX
DTC P0128 THERMOSTAT FUNCTIONPFP:21200
On Board Diagnosis LogicABS006NM
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 ProcedureABS006NN
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-26, "WATER INLET AND THERMOSTAT ASSEMBLY" .
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-226, "
Diagnostic Procedure"
.
WITH GST
1. Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureABS006NO
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-227, "
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
0128 Thermostat function The 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)
SEF176Y