Note On Intermittents

WARNING: This page is about a different car, the 1993 Cadillac Seville and 1993 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Manipulate affected wiring and connectors while observing PCM parameter PD02. Apply and release vacuum to MAP sensor vacuum port using a vacuum source. If PCM parameter PD02 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: PCM Code P031 Schematic - Shorted MAP Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code P031 Flow Chart - Shorted MAP Sensor Circuit

Courtesy of GENERAL MOTORS CORP.