Friday, February 24, 2012

Working of Manifold Absolute Pressure (MAP) Sensor?

Manifold Absolute Pressure (MAP) Sensor working operating procedure is as follows :---


The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (high vacuum) to above 4 volts with the ignition switch ON , engine not running or at wide-open throttle (low vacuum).

If the PCM detects a voltage that is lower than the possible range of the MAP sensor, a Diagnostic Trouble Code (DTC) will be set. A signal voltage higher than the possible range of the sensor will also set a DTC. An intermittent low or high voltage will also set DTCs. The PCM can also detect a shifted MAP sensor. The PCM compares the MAP sensor signal to a calculated MAP based on throttle position and various engine load factors. If the PCM detects a MAP signal that varies excessively above or below the calculated value, a DTC will be set. The MAP sensor is also used to measure barometric pressure under certain conditions, which allows the PCM to automatically adjust for different altitudes.

This will help.

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