Pcm Code E31 - Shorted Map Sensor Circuit: Description

MAP sensor output signal voltage is a DC voltage that varies with manifold absolute pressure. As MAP decreases, voltage decreases (low engine load, high vacuum). As MAP increases, voltage increases (high engine load, low vacuum).

PCM uses MAP sensor values as an indicator of engine load. A high MAP reading indicates heavy load; low MAP reading indicates low load. Code E31 is designed to set when PCM detects a MAP sensor signal out of high side limit or MAP signal of 4.85 volts or more and has a value greater than 108 kPa.