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Message: [QUOTE="6.0 Tech, post: 1560416, member: 23001"] The cam and crank sensors do run they the pcm. The crank has a tone wheel that’s missing a tooth at tdc #1 and the cam sensor has 1 tooth at #1, they cross and tell the computer where #1 is. If I remember right, the crank sensor supplies the voltage for the cam sensor. On Cummins swapped trucks, I have seen where they put a reluctor wheel on the damper and use it for rpm and all the other truck running commands the truck needs. Buddy had one and the ac quit, due to the crank sensor dying. Truck didn’t know it was running to command the ac compressor on. Sent from my iPhone using Tapatalk [/QUOTE]

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