Code P071, Intermittent Map Sensor: Action

WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

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

NOTE: Test numbers refer to numbers on diagnostic chart. Reference to CHART 3 refers to POWERTRAIN CHARTS.

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

Fig 1: Code P071 Schematic, Intermittent MAP Sensor

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P071 Schematic, Intermittent MAP Sensor

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code P071 Diagnostic Flow Chart, Intermittent MAP Sensor

Courtesy of GENERAL MOTORS CORP.