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Escort Cabriolet Club

Zetec Engine


aec361
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Speed sensor on the gearbox where the Speedo connects. It produces a square wave voltage when moving. The faster you go the higher the frequency. This signal is used by the ECU to hang the revs up a bit when stopping to prevent the engine from cutting out.

The usual fault with them is an internal failure which causes interference in the signal line which makes the engine revs hang up all the time giving you a fast idle speed.

There are some tight gits out there that just disconnect them instead of buying a new one!

Follow the cable up. It connects to the engine harness next to the brake servo. It has a three pin plug. Might be worth checking its connected first.

Will not show up on a code scan as all signals or no signal are plausable to the ECU.

Cheers

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