Manifold Absolute Pressure (MAP) Sensor
The MAP sensor measures intake manifold absolute pressure. The PCM uses information from the MAP sensor to measure how much exhaust gas is introduced into the intake manifold.
The MAP sensor for speed density systems is centrally located on the intake manifold and measures the intake manifold pressure. The PCM uses this information to determine the speed density air charge and to provide input for various engine control functions. The MAP sensor for a speed density system is integrated with an IAT sensor.