Note On Intermittents

WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Code P031 could be set during an engine backfire, which cause a rapid increase in MAP value. Check Code P031 snapshot.

Fig 1: Code P031 Schematic, Shorted MAP Sensor Circuit

Courtesy of GENERAL MOTORS CORP

Fig 2: Code P031 Diagnostic Flow Chart, Shorted MAP Sensor Circuit

Courtesy of GENERAL MOTORS CORP