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Home >> Geo >> 1989 >> Prizm Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes >> Diagnostic Charts >> Code 31, Manifold Absolute Pressure Sensor Open Or Shorted Circuit >> Diagnostic Aids
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Diagnostic Aids

An intermittent may be caused by rubbed through insulation or a wire broken inside the wire insulation. Check ECM harness connectors for backed out or damaged terminals. If code is intermittent, see TESTS W/O CODES article.

Fig 1: Code 31, Circuit Wiring Diagram & Flow Chart
G121646Courtesy of GENERAL MOTORS CORP.
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