Skylark V6-3100 3.1L VIN M SFI (1996)
Manifold Absolute Pressure (MAP) Sensor: Description and Operation
Manifold Absolute Pressure (MAP) Sensor The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure
(vacuum). The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (high vacuum) to above 4 volts with the key "ON," engine
not running or at wide open throttle (low vacuum).
The MAP sensor is used to determine manifold pressure changes while the linear EGR flow test diagnostic is being run (refer to DTC P0401), to
determine engine vacuum level for other diagnostics and to determine barometric pressure (BARO). If the PCM detects a voltage that is lower than
the possible range of the MAP sensor, DTC P0107 will be set. A signal voltage higher than the possible range of the sensor will set DTC P0108.
An intermittent low or high voltage will set DTC Pi 107 or Pi 106 respectively. The PCM can also detect a shifted MAP sensor. The PCM
compares the MAP sensor signal to a calculated MAP based on throttle position and various engine load factors If the PCM detects a MAP signal
that varies excessively above or below the calculated value, DTC P0106 will set.
