How Map Sensor Works. It must be able to measure atmospheric pressure at the lowest elevations, which in some areas is slightly below sea level. Reasons for a MAP sensor failure can be caused by a few factors. Depending on the application, the PCM will use this information to help calculate one or more of the following: fuel control, ignition timing, and EGR operation. The MAP sensor detects the absolute pressure of the intake manifold behind the throttle. In some cases, the MAP sensor is also used to determine barometric pressure. How Map Sensor Works
For this reason, the question of MAP versus MAF is a hot topic of debate among tuning enthusiasts who like to design or modify their own systems and accurately measure performance.
A bad manifold absolute pressure (MAP) sensor can upset fuel delivery and ignition timing.
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How Map Sensor Works Whenever the engine works hard, ingestion vacuum falls because of the throttle releases wide. The MAP sensor can be located in one of a few different spots, depending on the vehicle, including under the dashboard, on the firewall, around the inner fender area, or near the intake manifold. In other words, it provides manifold pressure information to the ECU or electronic control unit of the engine.