Circuit Description

Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). MAP sensor is located on right side of firewall. PCM applies 5-volt reference voltage to MAP sensor. Changes in pressure, resulting from engine load and RPM, are converted into a voltage signal monitored by PCM. A low voltage reading at PCM indicates low manifold pressure, and a high voltage at PCM indicates high manifold pressure.