There can be several issues:
- pump valve for backwards drive (1Y3) defected,
- defect in connection between module (N1:7, N1:16) and the pump
- traction potentiometer (1B2) defected (in my opinion most probable issue)
- wrong connection between module (N1:1, N1:32, N1:49, N1:61) and the traction poti,
- module defected (hopefully not)
Regards
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