Aurora V8-4.0L VIN C (1996)
Manifold Absolute Pressure (MAP) Sensor: Description and Operation
MAP Sensor
DESCRIPTION
The MAP sensor is mounted on top of the intake manifold and measures the changes in intake manifold pressure which result from engine speed and
load changes.
OPERATION
The PCM supplies a 5 volt reference signal and a ground to the sensor and the sensor outputs another voltage signal that is proportional to the pressure
signal. A high pressure (low vacuum) will produce a signal close to 5 volts and a low pressure (high vacuum) will produce a signal under one volt. The
PCM scales the MAP sensor signal in kilo-Pascals (kPa). The MAP signal is the Inverse of what is read on a vacuum gage. When the MAP value is
high, intake vacuum with a vacuum gage will be low. The PCM uses MAP information for EGR control and diagnostics. MAP information is also
used to determine barometric pressure and for ignition control. A faulty MAP sensor may cause various driveability conditions and should set a DTC.
