Diagnostic Aids

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

Fig 1: Code 31 Schematic (Except GSi), MAP Sensor Open Or Shorted Circuit

Fig 2: Code 31 Flow Chart (Except GSi), MAP Sensor Open Or Shorted Circuit