I try cranking my car after a few month n it wont start. Change two different main relay n still. Ecu have no power. Check all ground n it seem fine . Anyone got any ideal where to start. Would a harness go bad.

 

If the ecu isn't getting any power are you sure it's grounded correctly? Check the ground on the thermostat housing.

 

Is your battery dead? If it's not the problem what type of fuel are you running? If ethonal it sometimes can get almost like water and take a bit for it to start up.

 

Things can go bad anytime.....Bypass the ecu power from the harness and run new power wires from the battery to ecu..... if it works time to start chasing a power issue...

Does the rest of the car have power ?

 

I check it n sand it an still the same.

 

I tune on pump. No power to ecu relay dont click n pump dont prime

 

Everthing have power. Ecu relay n pump have no power. But if relay dont have power it wont turn the pump or ecu on

 

So ecu has no power? Can be verified by checking a 5v reference at tps sensor when key on, if there's no 5v ref there then ecu isn't getting power, check voltage at fuse box under the hood ELD fuse to ecu there should be 12v there if not then fuse box is most likely to be the culprit