An Actron Scantool CP 9110 is in my opinion a reliable way to read an older OBD-I

I would not trust an OBD-II scanner that is attempting to read your older pcm.

https://www.ebay.com/itm/Actron-CP-...34458746a937f4c9f7d74c57a10f83a542f6e73d

You need a Chrysler cartridge.