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Home >> Ford >> 1994 >> Probe Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Engine Controls - Theory & Operation - EEC-IV 3.8L) >> Computerized Engine Controls >> Input Devices >> Manifold Absolute Pressure (MAP) Sensor
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Manifold Absolute Pressure (MAP) Sensor

WARNING: This page is about a different car, the 1994 Mercury Sable, 1994 Mercury Cougar, 1994 Lincoln Continental, 1994 Ford Thunderbird, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

MAP sensor responds to manifold vacuum changes due to engine load and speed changes. Manifold pressure and temperature are used to calculate the airflow rate to the PCM.

The MAP sensor uses frequency to measure manifold vacuum. Map sensor frequency increases as vacuum increases. The MAP sensor is used as a barometric sensor for altitude compensation, updating the PCM during Key On, Engine Off (KOEO) and at Wide Open Throttle (WOT). By monitoring MAP sensor output voltage, the PCM can determine correct rate of spark advance, EGR flow and air/fuel ratio. If MAP sensor fails, the PCM will supply a fixed MAP value and use the Throttle Position (TP) sensor to control fuel distribution.

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