DTC P071: Intermittent Map Sensor Signal: Action

PCM uses a substitute MAP value based on engine RPM and throttle position switch status.

NOTE: Numbers in list refer to circled numbers in diagnostic flow chart, see Fig 1. For circuit identification see Fig 2.

Checking if the MAP sensor can read barometric pressure correctly (85 to 105 kPa).
Checking the MAP sensor ability to react to a known vacuum (26 to 34 kPa).
Checking the MAP sensor's ability to react to a sudden change in vacuum.

Fig 1: DTC P071: Intermittent MAP Sensor Signal Flow Chart

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P071: Intermittent MAP Sensor Signal Flow Chart Circuit

Courtesy of GENERAL MOTORS CORP.