Beretta L4-138 2.3L DOHC QUAD 4 HO MFI VIN A (1994)
Intake Air Temperature Sensor: Description and Operation
Intake Air Temperature Sensor
PURPOSE
The Intake Air Temperature (IAT) sensor is a thermistor used by the ECM/PCM to adjust fuel delivery and spark timing according to incoming air
density.
OPERATION
The ECM/PCM supplies a 5.0 volt signal to the IAT sensor through a resistor and measures the voltage. By measuring the voltage, the ECM/PCM
can determine IAT. Low intake air temperature produces a high resistance, while high intake air temperature produces a low resistance.
LOCATION
Intake Manifold
