2006 INFINITI M35 Factory Service Manual

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Page 2489 of 5621

INFINITI M35 2006 Factory Service Manual EC-946
[VK45DE]
DTC P0112, P0113 IAT SENSOR
Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNBS005CQ
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground

Page 2490 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0112, P0113 IAT SENSOR
EC-947
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Revision: 2006 January2006 M35/M45
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switc

Page 2491 of 5621

INFINITI M35 2006 Factory Service Manual EC-948
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2006 January2006 M35/M45
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionNBS005CT
The engine coolant temperature sensor is used to detec

EC-948
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2006 January2006 M35/M45
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionNBS005CT
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 dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicNBS005CU
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
–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
NameDTC Detecting Condition Possible Cause
P0117
0117Engine coolant tem-
perature sensor cir-
cuit low inputAn 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
0118Engine coolant tem-
perature sensor cir-
cuit high inputAn excessively high voltage from the sensor is
sent to ECM.
Detected items Engine operating condition in fail-safe mode
Engine coolant temper-
ature sensor circuitEngine 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.
ConditionEngine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or START 40
C (104F)
More than approx. 4 minutes after ignition ON or START 80
C (176F)
Except as shown above40 - 80
C (104 - 176F)
(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 2492 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-949
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Revision: 2006 January2006 M35/M45
DTC Confirmation ProcedureNBS005CV
NOTE:
If DTC Confirmation Procedure has been previousl

Page 2493 of 5621

INFINITI M35 2006 Factory Service Manual EC-950
[VK45DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2006 January2006 M35/M45
Wiring DiagramNBS005CW
TBWT1018E

Page 2494 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-951
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Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNBS005CX
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen

Page 2495 of 5621

INFINITI M35 2006 Factory Service Manual EC-952
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DTC P0117, P0118 ECT SENSOR
Revision: 2006 January2006 M35/M45
3. DETECT MALFUNCTIONING RART
Check the following.
Harness connector F291, F50
Harness for open or short between ECM and

Page 2496 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-953
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Revision: 2006 January2006 M35/M45
Component InspectionNBS005CY
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between e

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