What Does A Map Sensor Do On A Truck. The map sensor is found in vehicles with fuel injection and the main function of the map sensor is to provide the powertrain control module pcm ecm with information about the pressure in the intake manifold. The importance of a map sensor.

When at rest the map sensor reads atmospheric pressure at sea level 29 93 in. In other words it provides manifold pressure information to the ecu or electronic control unit of the engine. The ecm uses map sensor data to run crucial calculations such as engine load fuel injector pulse and spark advance.

The ecm uses map sensor data to run crucial calculations such as engine load fuel injector pulse and spark advance.

The pcm uses the map sensor s information along with input from other sensors to adjust fuel delivery to the cylinders and ignition timing according to current engine load and speed. The mass of air entering the engine is directly proportional to its density. As you may know the intake manifold is responsible for distributing the air and fuel mixture from the internal combustion chamber into each cylinder. The data is used to calculate air density and determine the engine s air mass flow rate which in turn determines the required fuel metering for optimum.