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Well yess there is, with a ohm meter. But that code 66 indicates the TCU isn't even looking for it. The code 66 says it is looking for TPS data from the engine computer which you don't have on the 3116. Like I suggested to Superman if it was looking for the standalone TPS and it had an issue...

TPS = Throttle Position Sensor. On the 3116 it is on the drivers side of The cylinder head above the primary fuel filter.

Well if it is in the mode of looking for a standalone TPS I would suspect it would give some form of TPS fault like a 21-12 or 21-23 for failed low or high as it would report a TPS voltage outside the idle and full throttle positions stored in memeory…

Ok, then it sounds like a harness mismatch or issue telling the TCU that it is in a different environment…

Have you ever seen this truck operate correctly? With a 3116 engine and properly programmed wtec2 or 3, you should never see code 66. That indicates loss of serial comms to the Engine Control Unit(expecting to see throttle position data from engine computer), which this truck never had… code...