October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

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