LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Geo >> 1993 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Diagnostic Charts >> Code 31 Manifold Absolute Pressure (Map) Sensor - PRIZM >> Diagnostic Aids
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Aids

If Codes 22, 24 and 41 are also set, problem is open sensor ground circuit. An intermittent may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections before replacing components.

Fig 1: Code 31 - Schematic (Prizm)
G93A78196Courtesy of GENERAL MOTORS CORP.
Fig 2: Code 31 - Flow Chart (Prizm)
G93C78198Courtesy of GENERAL MOTORS CORP.