Do you have a volt meter? If you do please check if there is battery voltage at the ignition coils. You should have battery voltage at the Light Green (LG) wire of the ignition coils (Green just for coil #1). If there is no voltage, then you may have a problem with the ECM relay. the relay also powers the ECM, which may explain why you cant connect to the ECM to check for codes. But please check for voltage at the coils first.
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