2005 INFINITI FX35 Service Manual

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Page 2305 of 4731

INFINITI FX35 2005 Service Manual EC-912
[VK45DE]
DTC P0112, P0113 IAT SENSOR
Revision: 2005 July 2005 FX
Diagnostic ProcedureABS007JX
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground scr

Page 2306 of 4731

INFINITI FX35 2005 Service Manual DTC P0112, P0113 IAT SENSOR EC-913
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Revision: 2005 July 2005 FX
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn igniti

Page 2307 of 4731

INFINITI FX35 2005 Service Manual EC-914
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2005 July 2005 FX
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionABS007K0
The engine coolant temperature sensor is used to detect the e

EC-914
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2005 July 2005 FX
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionABS007K0
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 LogicABS007K1
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEF594K
Engine coolant temperature
° C ( °F) Voltage* V Resistance k
Ω
–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
P0117
0117 Engine coolant tem-
perature sensor cir-
cuit low input An excessively low voltage from the sensor is
sent to ECM.
Harness or connectors
(The sensor circuit is open or shorted.)
Engine coolant temperature sensor
P0118
0118 Engine coolant tem-
perature sensor cir-
cuit high input An excessively high voltage from the sensor is
sent to ECM.
Detected items Engine operating condition in fail-safe mode
Engine coolant temper- ature sensor circuit Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON
or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or START 40 °C (104 °F)
More than approx. 4 minutes after ignition ON or START 80 °C (176 °F)
Except as shown above 40 - 80
°C (104 - 176 °F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates
while engine is running.

Page 2308 of 4731

INFINITI FX35 2005 Service Manual DTC P0117, P0118 ECT SENSOR EC-915
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Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS007K2
NOTE:
If DTC Confirmation Procedure has been previou

Page 2309 of 4731

INFINITI FX35 2005 Service Manual EC-916
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2005 July 2005 FX
Wiring DiagramABS007K3
TBWM0227E

Page 2310 of 4731

INFINITI FX35 2005 Service Manual DTC P0117, P0118 ECT SENSOR EC-917
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Revision: 2005 July 2005 FX
Diagnostic ProcedureABS007K4
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.

Page 2311 of 4731

INFINITI FX35 2005 Service Manual EC-918
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2005 July 2005 FX
4. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Che

Page 2312 of 4731

INFINITI FX35 2005 Service Manual DTC P0117, P0118 ECT SENSOR EC-919
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Revision: 2005 July 2005 FX
Component InspectionABS007K5
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance betwe

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