Friday, February 24, 2012

Working of Manifold Absolute Pressure (MAP) Sensor?

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


operation


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.
Thanks.

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