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Maybe ECU connector pin 14 200 1992

posted by  Grey245 on  Sun Oct 18 12:56 CST 2020
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Here's one from the -949 I had taken earlier.
Looks pretty much the same minus some circuitry, presumably for the EGR.
As you can see R215 has never been placed on this one. Can't help but notice that R315 got a little hot on your board.

Agreed, if the wires needed to be grounded on non-A/C cars, it would have been done in the factory. I tried to trace them, could see where they (14: GN and 15: GR-R) entered the wiring loom, but didn't see them exit. Logically, there would be a connector left hanging somewhere from the loom. I found several of those, but none with right colours.
Wether or not noise is the issue, I don't know yet.

But why are there TWO pins from the A/C to the ECU?

The difference between 750 and 950 rpm is pretty clear to me. Not just as seen on the tach, but also as heard by my ears. Even the drop from 1000 to 950 rpm can clearly be heard and seen, even if it's only a few needle widths on the (big) tach. I didn't measure exact numbers, but I have seen idle revs of 1000 and 1200 with the needle exactly on the respective marks. The 50 rpm drop is a guess.





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