F 250 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
Manifold Pressure/Vacuum Sensor: Description and Operation
Analog Manifold Absolute Pressure Sensor
The analog Manifold Absolute Pressure (MAP) sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns
a voltage signal to the PCM relative to intake manifold pressure. The sensor voltage increases as pressure increases. The MAP sensor allows the PCM
to determine engine load to calculate fuel quantity. In addition, the MAP signal is used to control smoke by limiting fuel quantity during acceleration
until a specified boost pressure is obtained.
A MAP signal fault detected by the PCM will cause the PCM to calculate an estimated manifold pressure based on known engine conditions.
