Intake manifold absolute pressure sensor (MAP)

Tweet

Intake manifold absolute pressure sensor (MAP) for the three wire resistor type pressure sensor mounted on the intake manifold. The sensor includes a silicon chip, a 3mm2 above the wafer is vacuum-sealed to the bottom wafer for the intake manifold pressure. When the engine, the intake manifold vacuum is generated, the silicon wafer beneath the intake manifold absolute pressure drop tube, so that the wafer is deformed, its resistance changes. MAP sensor measures the changes in the intake manifold air pressure, and transform it into an electrical signal to the PCM. PCM since MAP sensor intake manifold pressure to obtain information indicating the load condition of the engine, in order to calculate the amount of fuel injection and bmw ignition coil timing. MAP sensor signal is passed to the PCM at idle state voltage is low, less than 2V (when a high vacuum); engine is not running at full throttle or high signal voltage is approximately 4V. When the intake manifold PCM monitored MAP sensor signal indicative of the pipe absolute pressure 91Kpa or