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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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โˆ™ 2008-10-22 23:48:43
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Q: What is a VW Jetta engine speed sensor?
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