Leaderboard

This youtube channel guy shows how to test the CPS when the engine is running, with an oscilloscope analyzer. ** This should be recommended as an educational video, to understand the 3800 CPS The 18x pulses are regularly spaced. Of course, we know the 3x signals are not quite even (because the teeth have different size gaps). It's apparently the interplay between overlap of the 18x and 3x gaps that indicates to the ICM when and which spark plug fires. And of course, there are only 3 firings, since this is a 'waste spark' ignition. https://youtu.be/jACyNHl_L1g

I guess that is odd but I've never counted the pulses. I just checked to see if they were there. You have a good meter. My old one I had at the time I wrote the tutorial wouldn't work for testing the CPS. I have since bought a new meter that might work but I've not tried it on the CPS tests. I don't believe it's as good as the meter you have.

I found this on a Mazda Miata forum and I thought it was an interesting view of how others see our Reattas. I thought you might find it interesting too.