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this is a bit of a history lesson:

On early computer controlled engines the cam sensor was only really needed when the car started so the computer knew where the combustion cycle was. They ran a cross check with the crankshaft position sensor to insure the calibration was correct but complete failure would not cause serious trouble until the engine was shut off and a restart attempted.

Next level was when the manufacturers realised that if they measured the wear on camshaft drive components and or error in where the camshaft was timed they could make the engine run better and make less pollution.

Now with variable cam timing on multiple camshafts the computer measures the camshaft rotation to adjust the camshaft timing.

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13y ago

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