I have a 2004 Nissan Quest the engine runs however I can't connect to the ECM with three different readers. I do read 60 ohms between pin 6,14 on the DLC. When I turn the key to the "ON" position the check engine light does turn on. So who do I test or know if I have faulty ECM if my readers can't connect to the ECM? What other steps should I take to help diagnose the problem.

Thank you,
Tim