Pcm Code E32, Open Map Sensor CKT: Description
WARNING: This page is about a different car, the 1992 Cadillac Fleetwood and 1992 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
MAP sensor changes resistance based upon manifold vacuum. PCM provides a 5-volt reference and ground. MAP signal varies between ground and 5 volts as manifold vacuum varies. PCM Code E32 sets when PCM detects a MAP sensor signal that is too low.