Pcm Code P071 - Intermittent Map Sensor Signal: Action

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

1. Checks if MAP can read BARO pressure correctly (87-105 kPa).
2. Checks MAP sensor's ability to react to a known vacuum (26-34 kPa).
3. Checks MAP sensor's ability to react to sudden change in vacuum.

Fig 1: PCM Code P071 Schematic - Intermittent MAP Sensor Signal

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code P071 Flow Chart - Intermittent MAP Sensor Signal

Courtesy of GENERAL MOTORS CORP.