DIY: Hopeless project.

[Rascal21]

Changed ECU and the same symptoms appear to haunt the car, she wont start but she cranks with the best of them.
In a bid to make sure the battery is good, I took that out of the car and put it into an audi with far more voltage requirements than that of a 4AGE, and the Audi (which has not been fired up for a year) started right up on first try.
So then I put it into my AE86 (which has rear-battery reloc and not been started for 2 months) and it too started on first try.

All ignition components are changed bar the distributor itself.
ECU, Igniter, Coil, relays, fuses and wires, fuel pump etc etc have all been changed, some more than once.
This leaves wiring harness I suppose, but it`s odd that I cant get a test light working on any of these two ECU`s, I turn ignition on and probe W-pin directly on the ECU with positive probe from the light and earth on the other probe without as much as a single flicker..

I KNOW the ECU is getting power with its own completely separate and fully working wiring harness that I`ve measured and tested into oblivion, so it is quite puzzling that the Warning/CEL wont work, if the ECU could just squeak to me as to what just might be the big deal I would not be sitting here wasting everyones time

The good news is I now have the spare parts that I`ve always wanted for this car should they ever go bad (4-5 coils, 2 ecu`s, 3 igniters, 3 alternators, 2 starters, 2 tps`s, 4 injectors etc), all I have to do now is to measure resistance between harness plugs at the ECU and injectors+igniter and so forth to find out if the harness is bad and from there attempt to either patch it or make a new harness.

For a pre-historic EFI system it`s putting up a darn good fight all things considered..