Note: Allpar does not take responsibility for the veracity of any information or opinions here, does not claim expertise, and is not responsible for any consequences. Please proceed at your own risk.

Cars by name
Trucks and Jeeps

Engines / Trans
Repairs / Fixes
Tests and Reviews

Jack Smith: Creating the Road Runner

1957: two steps forward...

1967! (A half century later)

Air Charge Temperature Sensor

The signals from the Air Charge Temperature sensor and the MAP sensor are used to monitor both the temperature and pressure of the air entering the combustion chamber.  This information is used by the ECU to calculate fuel delivery.  This is especially important at WOT or wide open throttle. 

coolant - air charge sensor

In the 1984 model year, the sensor was a thermistor (temperature-sensitive resistor) used with a fixed resistor; together they measure between 5,290 ohms to 5,610 ohms at 77° F.  Using the resistor with the thermistor increases the accuracy of the sensor at higher temperatures.

The sensor design for 1985 and later years used just the thermistor, which measures between 9,120 ohms to 10,880 ohms at 77° F. In both cases the voltage from the sensor should be around 2.5v at 77° F. [The part number is the same part as the coolant temperature sensor. — ed.]

The sensor was not used in 1988 model year Turbo I engines; the ECU used results from the battery temperature and coolant temperature sensors to calculate the incoming air temperature. Still, for Turbo 2 engines, the sensor was used, because the temperature of the air charge could vary based on how efficiently the intercooler cooled the air charge.

The sensor was discontinued after 1991 in throttle-body injected engines; and the engines themselves followed after 1994.

Sensors, Switches, and Other Systems | Main Repairs Page | EEKs

New Ram for Texans on its way

Recall reveals when Cherokee moved

Smoothing engines with torque reserves

More Mopar Car
and Truck News