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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 >> Flexible Fuel (FF) Sensor
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Flexible Fuel (FF) 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.

FF sensor is a capacitive device with a signal processing stage. FF sensor is located in engine compartment, high-pressure fuel supply line between fuel mixer and fuel rail. FF sensor frequency signal varies according to conductivity and temperature of methanol-gasoline mixture. As percentage of methanol in fuel increases, output frequency of FF sensor signal will increase. For example, a fuel mixture that was determined to be 30 percent methanol will result in FF sensor signal output frequency being 60-100 Hz. Sixty percent methanol will result in FF sensor signal of 90-130 Hz. The PCM uses FF sensor frequency signal to calculate correct air/fuel ratio and spark advance.

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