Durango 4WD V8-5.9L VIN Z (1998)
Manifold Pressure/Vacuum Sensor: Description and Operation
Fig 10 MAP And Throttle Position Sensor Location - Typical
DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor reacts to absolute pressure in the intake manifold. It provides an input voltage to the powertrain
control module (PCM). The MAP sensor is mounted into the right side of the intake manifold.
OPERATION
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.
CIRCUIT OPERATION
From the Powertrain Control Module (PCM), circuit K6 supplies 5 Volts to the Manifold Absolute Pressure (MAP) sensor Circuit K6 connects to
cavity A17 of the PCM.
Circuit K1 delivers the MAP signal to the PCM. Circuit K1 connects to cavity A27 of the PCM.
The PCM provides a ground for the MAP sensor signal (circuit K1) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.
