Manifold Absolute Pressure (Map) Sensor

The MAP sensor measures absolute pressure in intake manifold. Both mixture density and ambient barometric pressure are supplied to ECU by MAP sensor. Sensor is mounted in plenum chamber at middle of firewall in engine compartment. Sensor receives manifold pressure information through vacuum line from throttle body. See Fig 1 .

Fig 1: Manifold Absolute Pressure (MAP) Sensor

Courtesy of CHRYSLER MOTORS.