ok i got a 91 hatch dx stock im getting no power to the ecu i switched ecu i got a brand new one the red lite still wont come on checked fuses,grounds,every thing i found nothing and its driving me crazy can someone please help me

 

did you turn the key to "on" position?
j/k


which ground did you check? if i remember correctly the ecu ground is the one on the thermostat housing.

 

Quick related question: the car wont start with a bum ecu will it? I got a pm6 from the pick n pull and i plugged it in. My car is still dpfi but it started up. Check engine light was on though. I just wanna know if i should take it back. Sorry for the thread jack.

 

car will start but run/idle like crap. you should have some CEL's if you have a dpfi car with a mpfi ecu plugged in

 

yeah i guess ill have to wait till i get the rest of my mpfi stuff to see if it works

 

1. ground at thermostat housing
2. main relay
3. ignition switch

 

a main relay will cause the ecu not to have power the ground on the housing is good and the car is turning over fine

 

anymore ideas?????????

 

the ECU gets its power from the main relay - yellow/black wire from main relay which splits inside the harness and goes to ECU pins A13 and A15