Trooper (4 Door) V6-3165cc 3.2L DOHC (6VD1) (1992)
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Intake Air Temperature Sensor: Description and Operation
MAT Sensor
PURPOSE
Provides the Engine Control Module (ECM) with intake air temperature. The ECM uses this information to determine air density.
LOCATION
In the common chamber.
OPERATION
The ECM supplies a 5V reference signal to the sensor and by measuring the voltage change can determine the manifold air temperature.
IAT sensor is also used to control spark timing and delays EGR when intake air is cold.
A failure in Intake Air Temperature (IAT) sensor circuit should set a Code 23.
CONSTRUCTION
The Intake Air Temperature (IAT) Sensor is a thermistor (resistor) whose resistance value varies in relation to the temperature of air entering the
engine. Low temperature results in high resistance (100K ohms at -40°C / -40°F); high temperature results in low resistance (70 ohms at 130°C /
266°F).
