2007 INFINITI M35 Factory Service Manual

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Page 2449 of 4647

INFINITI M35 2007 Factory Service Manual EC-920
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DTC P0102, P0103 MAF SENSOR
Revision: 2007 April2007 M35/M45
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3.

Page 2450 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0102, P0103 MAF SENSOR
EC-921
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Revision: 2007 April2007 M35/M45
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
Crus

Page 2451 of 4647

INFINITI M35 2007 Factory Service Manual EC-922
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DTC P0112, P0113 IAT SENSOR
Revision: 2007 April2007 M35/M45
DTC P0112, P0113 IAT SENSORPFP:22630
Component DescriptionNBS005CM
The intake air temperature sensor is built-into mass air

Page 2452 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0112, P0113 IAT SENSOR
EC-923
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Revision: 2007 April2007 M35/M45
Wiring DiagramNBS005CP
TBWT1017E

Page 2453 of 4647

INFINITI M35 2007 Factory Service Manual EC-924
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DTC P0112, P0113 IAT SENSOR
Revision: 2007 April2007 M35/M45
Diagnostic ProcedureNBS005CQ
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws

Page 2454 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0112, P0113 IAT SENSOR
EC-925
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Revision: 2007 April2007 M35/M45
3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch

Page 2455 of 4647

INFINITI M35 2007 Factory Service Manual EC-926
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DTC P0117, P0118 ECT SENSOR
Revision: 2007 April2007 M35/M45
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionNBS005CT
The engine coolant temperature sensor is used to detect

EC-926
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DTC P0117, P0118 ECT SENSOR
Revision: 2007 April2007 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 kΩ
–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
0117Engine coolant temperature
sensor circuit 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 temperature
sensor circuit high inputAn excessively high voltage from the sensor
is sent to ECM.
Detected items Engine operating condition in fail-safe mode
Engine coolant temperature
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 (104°F)
More than approx. 4 minutes after ignition ON or START 80°C (176°F)
Except as shown above40 - 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 2456 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0117, P0118 ECT SENSOR
EC-927
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Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS005CV
NOTE:
If DTC Confirmation Procedure has been previously conduc

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