DTC 31 - Map Sensor Signal

MAP sensor detects the intake manifold absolute pressure as a voltage. ECM determines basic injection duration and basic ignition advance angle based on this voltage. DTC 31 sets when there is an open or short in MAP sensor circuit for .5 second or more. Check for an open or shorted MAP sensor circuit, a faulty MAP sensor or ECM.

Fig 1: DTC 31 - Schematic

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Fig 2: DTC 31 - Output Voltage/Absolute Pressure Reference Chart

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Fig 3: DTC 31 - Diagnostic Flowchart (1 Of 2)

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Fig 4: DTC 31 - Diagnostic Flowchart (2 Of 2)

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