Speed Sensor and Engine Performance
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12-02-2001, 06:49 PM
Join Date: Mar 2001
Location: Columbia, SC.
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Speed Sensor and Engine Performance
Just wanted to pass this on, for 97, 98 F-150s with oversize tires and no speed sensor gear change ... Same may be true for 99 - 02 F-150s
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The PCM (Programmable Control Module). needs to know vehicle speed to properly handle transmission shift strategy, and it also does some pretty interesting things with the fuel and emission system based on vehicle speed. For example, the PCM will shut the injectors down if the truck is driven above a certain speed. Also, the OBD II part of the PCM’s program uses the speed signal to time its drive-cycle tests.
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http://www.motorage.com/edindex/1100mag.htm
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The PCM (Programmable Control Module). needs to know vehicle speed to properly handle transmission shift strategy, and it also does some pretty interesting things with the fuel and emission system based on vehicle speed. For example, the PCM will shut the injectors down if the truck is driven above a certain speed. Also, the OBD II part of the PCM’s program uses the speed signal to time its drive-cycle tests.
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http://www.motorage.com/edindex/1100mag.htm