Diagnostic Aids

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

Fig 1: CODE 31 - Schematic (Prizm) Manifold Absolute Pressure Sensor, Open Or Shorted Circuit

Fig 2: CODE 31 - Flow Chart (Prizm) Manifold Absolute Pressure Sensor, Open Or Shorted Circuit