I'm having trouble with my '89 classic and decided to try swapping the ECU from my '95 D90 into it. My question is - should it run?
Here's some background. I decided to relocate my classic's ECU and relays to under the dash instead of under the passenger seat so it wouldn't get wet. Seemed easy enough, in fact, too easy. There is plenty of length in the wires and I didn't even have to undo any connections. 30 minute job if you are slow like me.
Now it won't start. I confirmed spark and it cranks strong. There is no power getting to the fuel pump nor the fuel pump fuse (and fuse is good and swapped it anyway). I thought that maybe the ECU case was supposed to be grounded so I ran a jumper from the negative terminal to the case and no luck there. I swapped fuel pump and fuel injection relays with spares too. I looked around for a wire that might have broken and didn't find anything though I really was pretty gentle with everything.
Also, should the fuel pump and fuel pump fuse have power when the key is in the on position or only if I'm cranking it?
'95 Soft Top
'89 Classic Tdi