the car is cold. By that, the car should sit overnight either outside or in a cold place as an unheated garage. Then you do this test first thing after starting the car. The tranny has be cold.

As Paul says, the car should stay in lower gear where it seems that the tranny is not working right, because it won't shift.

If everything is ok, it will shift up and that says the module is ok.

If it doesn't (ie the car shifts right away), then it is probably the module itself.

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Regards . . . . JimF
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'94 S500 Cpe

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