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SENSOR - INLET AIR TEMPERATURE
REMOVAL — 8.3L
NOTE: Take care not to damage the thermister pill
when removing the sensor.
1. Remove the battery cover and disconnect the neg-
ative battery cable.
2. Disconnect the electrical connector from the inlet
temperature sensor.
3. Remove sensor from inlet hose.
INSTALLATION
NOTE: Take care not to damage the open ther-
mister pill when installing the sensor.
1. Install sensor , use a little water to aid in insertion
of sensor.
2. Make sure that the rib on the sensor matches up
with the rib on the inlet hose. The thermister pill
shouldbeindirectcontactwiththeinletairstream.
3. Connect the electrical connector.
4. Connect the negative battery cable and install bat-
tery cover.
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SENSOR-INTAKE AIR TEMPERATURE
DESCRIPTION
3.7L V-6
The 2-wire Intake Manifold Air Temperature (IAT) sen-
sor (1) is installed in the intake manifold with the sen-
sor element extending into the air stream.
The IAT sensor is a two-wire Negative Thermal Coef-
ficient (NTC) sensor. Meaning, as intake manifold tem-
perature increases, resistance (voltage) in the sensor
decreases. As temperature decreases, resistance
(voltage) in the sensor increases.
4.7L V-8
The 2-wire Intake Manifold Air Temperature (IAT) sen-
sor (3) is installed in the intake manifold with the sen-
sor element extending into the air stream.
The IAT sensor is a two-wire Negative Thermal Coef-
ficient (NTC) sensor. Meaning, as intake manifold tem-
perature increases, resistance (voltage) in the sensor
decreases. As temperature decreases, resistance
(voltage) in the sensor increases.
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5.7L V-8
The 2-wire Intake Manifold Air Temperature (IAT) sen-
sor is installed in the intake manifold (2) with the sen-
sor element extending into the air stream.
The IAT sensor is a two-wire Negative Thermal Coef-
ficient (NTC) sensor. Meaning, as intake manifold tem-
perature increases, resistance (voltage) in the sensor
decreases. As temperature decreases, resistance
(voltage) in the sensor increases.
OPERATION
The IAT sensor provides an input voltage to the Powertrain Control Module (PCM) indicating the density of the air
entering the intake manifold based upon intake manifold temperature. At key-on, a 5–volt power circuit is supplied
to the sensor from the PCM. The sensor is grounded at the PCM through a low-noise, sensor-return circuit.
The PCM uses this input to calculate the following:
Injector pulse-width
Adjustment of spark timing (to help prevent spark knock with high intake manifold air-charge temperatures)
The resistance values of the IAT sensor is the same as for the Engine CoolantTemperature (ECT) sensor.
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REMOVAL
3.7L V-6
The intake manifold air temperature (IAT) sensor is
installed into the left side of intake manifold plenum.
1. Disconnect electrical connector from IAT sensor.
2. Clean dirt from intake manifold at sensor base.
3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.
Page 2309 of 5267
4.7L V-8
The intake manifold air temperature (IAT) sensor (3) is
installed into the left side of intake manifold plenum.
1. Disconnect electrical connector from IAT sensor.
2. Clean dirt from intake manifold at sensor base.
3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.
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5.7L V-8
The intake manifold air temperature (IAT) sensor (2) is
installed into the front of the intake manifold air box
plenum.
1. Disconnect electrical connector (2) from IAT sensor.
2. Clean dirt from intake manifold at sensor base.
Page 2311 of 5267
3. Gently lift on small plastic release tab (3) and
rotate sensor about 1/4 turn counterclockwise for
removal.
4. Check condition of sensor O-ring.
INSTALLATION
3.7L V-6
The intake manifold air temperature (IAT) sensor (1) is
installed into the left side of intake manifold plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab (2).
4. Install electrical connector.
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4.7L V-8
The intake manifold air temperature (IAT) sensor (3) is
installed into the left side of intake manifold plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab.
4. Install electrical connector.
5.7L V-8
The intake manifold air temperature (IAT) sensor (2) is
installed into the front of the intake manifold air box
plenum.
1. Check condition of sensor O-ring.
2. Clean sensor mounting hole in intake manifold.
3. Position sensor into intake manifold and rotate
clockwise until past release tab.
4. Install electrical connector.