Town & Country AWD V6-3.8L VIN L (2003)
Intake Air Temperature (IAT) Sensor: Description and Operation
Fig. 19 3.3/3.8L IAT Sensor
Inlet/Intake Air Temperature
The IAT Sensor is a Negative Temperature Coefficient (NTC) Sensor that provides information to the PCM regarding the temperature of the air
entering the intake manifold.
Battery Temperature (SBEC Vehicles without Battery Temperature sensor)
The inlet air temperature sensor replaces the intake air temperature sensor and the battery temperature sensor. The PCM uses the information from the
inlet air temperature sensor to determine values for the PCM to use as an intake air temperature sensor and a battery temperature sensor.
The battery temperature information along with data from monitored line voltage (B+), is used by the PCM to vary the battery charging rate. System
voltage will be higher at colder temperatures and is gradually reduced at warmer temperatures.
The battery temperature information is also used for OBD II diagnostics. Certain faults and OBD II monitors are either enabled or disabled depending
upon the battery temperature sensor input (example: disable purge, enable LDP). Most OBD II monitors are disabled below 20 °F.
