Check Engine Light

SON240sx Automotive
1

Has anyone else had a check engine light come on as soon as you connect the battery?

This is an SR into a '90 S13, with a DOHC KA cluster.

I have no clue what is causing this… and the ECU that came with the clip fried itself when I first tried, though I later found out that it had severe water damage and that was probably the cause. However I don’t want to fry another ECU…

The only wiring I’ve done was to re-pin the plugs behind the battery to match wires, and swap the dash plug and match up the 5 needed wires there. This was done correctly, I’ve checked it too many times to count.

2

check the grounds, i had that happen

3

On the motor harness, or elsewhere?

4

i would check your dash wiring for shorts.

5

Ok, I checked every ground on the ECU plug, and they are all good.

I checked every pin on the dash plug for a short to ground and there is nothing, except the speedo signal gives me 30 ohms… is that normal?