Join Date: Feb 2018
Location: Fort Worth Texas
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The transistors are on the coils themselves. Each coil has 3 wires plus a 4th coil output.
I think we are getting confused with 'signal'. Signal is not active at all until engine is turning (then getting crank sensor pulses) and read with oscilloscope or Consult as you cannot read directly at the ECM, the service manual expressly calls that out as ECM damage trying. That means reading the signal wire at coil too. Signal is NOT coil power which is on with key on engine off.
6 times a second is work??? That is not working at all on the transistor, they can work 100X times faster than that. I ran a single switching transistor ignition box for 8 cylinder race engines at 7000+ rpm (466X a second) and never failed one at all.
There is also a central condenser in the coil power circuit that if bad could do damage as well. It absorbs transistor volt spikes besides keeping radio sound clean.
I agree, look at the grounds, they must be clean. And that condenser.
Not that easy to solder a chip that small in but not undoable.........