RAM 3500 Truck 2WD V10-8.0L VIN W MDC (1999)
Manifold Pressure/Vacuum Sensor: Description and Operation
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR-PCM INPUT
The MAP sensor reacts to absolute pressure in the intake manifold. It provides an input voltage to the powertrain control module (PCM). As
engine load changes, manifold pressure varies. The change in manifold pressure causes MAP sensor voltage to change. The change in MAP sensor
voltage results in a different input voltage to the PCM. The input voltage level supplies the PCM with information about ambient barometric
pressure during engine start-up (cranking) and engine load while the engine is running. The PCM uses this input along with inputs from other
sensors to adjust air-fuel mixture.
MAP Sensor Location - Typical
The MAP sensor is mounted into the right side of the intake manifold.
