The Manifold Absolute Pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load.
The control module supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The control module also provides a ground on the low reference circuit. The MAP sensor provides a signal to the control module on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The control module should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The control module should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The control module monitors the MAP sensor signal for voltage outside of the normal range.
Removal & Installation
- Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
- Remove the MAP sensor retaining bolt and bracket.
- Remove the MAP sensor and the MAP sensor port seal if it is still retained in the intake manifold.
- Install the MAP sensor to the intake manifold.
- Install the MAP sensor retaining bracket and tighten the bolt 89 inch lbs. (10 Nm).
- Connect the MAP sensor electrical connector.