850 T5 automatic transmission

Yes Hello, while driving backwards my car has stopped, then switched back and forth, the arrow does not blink, in reverse it rolls forward now. The mechanical circuit works. When I read out codes 3-1-3 and 2-2-3 I have disassembled once and cleaned the problem still exists. has someone often had this problem and a solution ready? And where do I get a schematic for the automatic transmission from with pin support ung. Thank you in advance