Rodeo (4WD) V6-3165cc 3.2L SOHC (6VD1) (1993)
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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.
OPERATION
The ECM supplies a 5V reference signal to the sensor and by measuring the voltage change can determine the manifold air temperature.
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).
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.
