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The way the system works is the crank position sensor data is compared to the individual cam position sensors, and the “deviation” value is determined by an algorithm in the DME mathematically. The readout value is how far it is off “ideal”.
There are two cam position sensors, one on each bank, and I believe they are interchangeable, as well as being testable (they are a simple Hall Effect sensor that generates a signal when a ferrous alloy shutter passes nearby). You should be able to bench test the suspect, or swap them around to see if the reverse occurs. They cost between $70 and $150 each, aftermarket vs. OEM.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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