Scan tool recommendations
After replacing my ecm with a reman, new batteries and new bulbs for the dash indicator lights, my "warning" light comes on after about a minute of running. When this happens the fast idle switch stops working. If I understand correctly I need a j1939 compatible scan tool to diagnose. I have a couple obd2 code readers, is it as simple as buying an adapter or do I need a specific scan tool? I have been looking at them online but not really sure what I need, please make a recommendation.