The normal cause of problems with codes that state open or closed circuit is an improper current flow in the device. To understand when a circuit is closed, whether a device was really there, a dropping resistance in the controller has its volatge measured across. This tells the controller the current flow. A small coil of wire such as the "upshift delay" switchover valve will probably exhibit 250ma to 350ma (I am guessing). The controller probably wouldn't fault 100ma or 700ma if those were the right numbers. I'm not sure why the software guys can't figure out whether it high or low though.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician