Multiecuscan

I have Multiecuscan v 4.8 with KKL cable.
When I connect to the transmission control unit and have the battery voltage graph drawn I see this



When I switch to the engine control unit, the graph is the same without dropouts.
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Well, now I'm solving where is the problem?
Is the transmission ECU faulty?
Is the problem in the wiring?
Is the problem in the wiring?
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Can anyone advise?