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ECU, or injector driver transistor, or coil pack driver transistor, etc, is simply to use a 12V LED and attach it into the harness side connector with the engine running to verify you are getting a signal to the component in question. Keep in mind that LEDs are polarity sensitive so if you dont get a pulse, swap its leads around to double check.
Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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