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IMO, it's a misleading back-circuit and not relevant to your starter problem.

My book only shows the ECU connection.

But I see John's point. He suggests using a test light instead of a meter.

One of the pitfalls of using a meter to trace a circuit stems from the high sensitivity of a voltmeter these days. The old trick of inserting a voltmeter between battery post and cable to find the "drain" easily fails with DMMs and solid state equipment with trickle-rate keep alive draws.

Try this (what I think John was getting at), connect one end of your high tension coil wire to +12, and measure what you get at the other end, first with a meter, then a test light. Opposite results.

If the ECU imparts a slight current (back-circuit) you could not, with a meter measuring voltage, distinguish it from a dead short to battery (like if the remote starter relay welded closed) where the current drawn by a test lamp would give you much more information.

So the next question is what killed the starter? The remote unit go crazy?

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Art Benstein near Baltimore