Read out error code

Moin together, had already tortured the search, but I have not yet found the right answer. Here I have a 96 V70, i.e. one of the first. Engine control burns (which with the Lambda symbol). The car has between the seats in the armrest under a cover labeled with OBDII, a socket that looks like an OBDII socket, but black and apparently different. With my BT OBDII stick and Torque the stick gets electricity. LED and Torque, sons t is not found. So far I have been able to get there everywhere, as far as pure OBDII is concerned. Now I have read that the motor control unit is on PIN3 instead of PIN7. If I now make the connection stick socket with cable bridges between PIN 4/5, 16 and pull from PIN3 socket on PIN7 stick. do I get it then? I have found this further, but there is not explicitly the V70, but the 850, 940 and 960. Can I just try it all or run danger, because what abz I also have a KKL-Interface Autodia K509 and Carport, which is actually for VAG, but should be irrelevant for OBDII. Maybe you can use it to conjure up something I’m very confused, can someone please enlighten me? Thanks already. mfg