Quote:
Originally Posted by dreksnot
The FF sensor is omni-directional for flow.
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Emkay, maybe I was wrong
Could have sworn I had seen arrows, could just be crazy. Any who. I’m still thinking power or ground. Engine loads pulling power or ground away from the sensor. Being a diesel tech for GM, John Deere and now Cat, 20 years this month to be exact, I have seen similar problems. It would be an easy check just to put the sensor on a separate circuit with its own chassis ground. If it doesn’t change then put it back.
Can data communication circuits have had this problem in several applications. Duramax was a prime example. GM put ecm, tcm, ficm, and glow plug module on the same can circuit. Glow plug module would crack from vibration and heat, short internally just enough to pull can leg voltage down from 2.5 volts to below 1 volt. This would shut the engine down and nothing would communicate to each other. Unplug the gpcm and engine would start and run. Point is, if a circuit has a strong enough current draw, voltage will be pulled away to find ground.