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In older cars that used a distributor, the distributor shaft was connected to the camshaft. The camshaft was connected to the crankshaft. So as they all turned, the spark would fire in direct correlation to the crankshaft. Once they eliminated the distributor, the computer needed a way to determine when to fire the spark. So they place a sensor near the end of the crankshaft and it reports the crankshaft position to the computer. So the computer can know when to fire the spark for each cylinder.

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11y ago
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Q: What is purpose of crankshaft position sensor circuit perf?
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