July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Note On Intermittents

Manipulate affected wiring and connectors while observing ECM parameter ED02. Apply and release vacuum to MAP sensor vacuum port using a vacuum source. If ECM parameter ED02 displays greater than 108 kPa, condition has been induced and intermittent should be repaired. If wiring and connectors are okay, substitute a known good sensor and retest.

Fig 1: ECM Code EO31 Circuit Diagram

Fig 2: ECM Code EO31 Flow Chart