2005 INFINITI FX35 Service Manual

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Page 2321 of 4731

INFINITI FX35 2005 Service Manual EC-928
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DTC P0125 ECT SENSOR
Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS007KH
CAUTION:
Be careful not to overheat engine.
NOTE:
If DTC Confirmation Procedure has been previous

Page 2322 of 4731

INFINITI FX35 2005 Service Manual DTC P0125 ECT SENSOR EC-929
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Revision: 2005 July 2005 FX
3. CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70 °C (158 °F)] condition

Page 2323 of 4731

INFINITI FX35 2005 Service Manual EC-930
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DTC P0127 IAT SENSOR
Revision: 2005 July 2005 FX
DTC P0127 IAT SENSORPFP:22630
Component DescriptionABS007KL
The intake air temperature sensor is built into mass air flow sensor.
The

Page 2324 of 4731

INFINITI FX35 2005 Service Manual DTC P0127 IAT SENSOR EC-931
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Revision: 2005 July 2005 FX
b. Select “DATA MONITOR” mode with CONSULT-II.
c. Check the engine coolant temperature.
d.

Page 2325 of 4731

INFINITI FX35 2005 Service Manual EC-932
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DTC P0127 IAT SENSOR
Revision: 2005 July 2005 FX
Component InspectionABS007KP
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor termi-
nals 5 and

Page 2326 of 4731

INFINITI FX35 2005 Service Manual DTC P0128 THERMOSTAT FUNCTION EC-933
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Revision: 2005 July 2005 FX
DTC P0128 THERMOSTAT FUNCTIONPFP:21200
On Board Diagnosis LogicABS007KR
Engine coolant

DTC P0128 THERMOSTAT FUNCTION EC-933
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Revision: 2005 July 2005 FX
DTC P0128 THERMOSTAT FUNCTIONPFP:21200
On Board Diagnosis LogicABS007KR
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 ProcedureABS007KS
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-53, "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-933, "
Diagnostic Procedure" .
WITH GST
1. Follow the procedure “WITH CONSULT-II” above.
Diagnostic ProcedureABS007KT
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-934, "
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)

Page 2327 of 4731

INFINITI FX35 2005 Service Manual EC-934
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DTC P0128 THERMOSTAT FUNCTION
Revision: 2005 July 2005 FX
Component InspectionABS007KU
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor

Page 2328 of 4731

INFINITI FX35 2005 Service Manual DTC P0132, P0152 HO2S1 EC-935
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Revision: 2005 July 2005 FX
DTC P0132, P0152 HO2S1PFP:22690
Component DescriptionABS007KW
The heated oxygen sensor 1 is p

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