ECM DTC EO32: Open Map Sensor Circuit: Description

The manifold absolute pressure sensor (MAP) is a "3-Wire" sensor, a potentiometer that change resistance based upon manifold vacuum. The ECM provides a 5 volt reference on CKT 474 and ground on CKT 476. The MAP signal (CKT 432) varies between ground and 5 volts as manifold vacuum varies. As MAP decreases, voltage decreases (low engine load, high vacuum). As MAP increases, voltage increases (high engine load, low vacuum). The ECM uses MAP sensor values as an indicator of engine load. A high MAP reading indicates heavy load and a low MAP reading indicates a light load. Code EO32 sets when the ECM detects a MAP sensor signal too low (MAP value 15 kPa). Possible causes of Code EO32 are, short to ground on CKT 432. Defective MAP sensor. Loss of 5V to MAP sensor.