I have a jumper harness i bought from a friend and im not sure if somethings wrong with it.
I plugged in two different ECU's and they don't let the fuel pump turn on. Then i put the stock ecu in and it fires right up. What pins should i look for on the jumper harness. I already looked at the fuel relay pins and they are correct... Maybe there are some other pins i should check??? Maybe the ECU isn't turning on? Some one please point me in the direction. Thankss.

 

Did you try another obd1 ecu to see if the issue was related to the ecu ?

 

Is there a solid CEL when you try the OBD1 ECU?

 

i tried two different ECU's and both have no power it seems.

 

What make, model, and year is your car?

 

fuel pump is in two diff places depending on the year and if you have a teg or civ