VW Jetta
Cars & Vehicles

What is a VW Jetta engine speed sensor?

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October 22, 2008 11:48PM

The engine speed sensor provides the ECM with a crankshaft

position signal. The ECM uses the signal to determine a crankshaft

reference point (Top Dead Center) and calculate engine speed (RPM.)

The signal is also used by the On-Board Diagnostic system for

misfire detection. The ignition system will not operate if the ECM

does not receive an engine speed sensor input.

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