Car keeps blowing the ecm fuse in the engine bay within 3 seconds of running. Ideas?

 

dude... we need more information than that. The more, the better. What have you tried? What symptoms are you having? What has changed right before it started happening? List ANYTHING you've done to the vehicle recently (oil change? fuel pump replaced? tires rotated?)



He replaced the fuse, and it popped again.



It's B (20A) in the diagram:



Fusible link

Description _-_ Amperages _-_ Circuit protected

A (Dark blue) _-_ 100A _-_ Generator

B (Blue) _-_ 20A _-_ Engine control relay, Fuel pump relay

C (Pink) _-_ 30A _-_ Power windows

D (Blue) _-_ 20A _-_ A/C condenser fan control

E (Red) _-_ 50A _-_ Battery power source

F (Green) _-_ 40A _-_ Head lamps, Tail lamps

G (Pink) _-_ 30A _-_ Radiator fan control

H (Pink) _-_ 30A _-_ ABS control

I (Pink) _-_ 30A _-_ ABS control

J (Pink) _-_ 30A _-_ Ignition power source

K (Pink) _-_ 30A _-_ Blower control

 

I had that happen when my alarm wiring had a short.

 

going to work on it now will update tonight

 

UPDATE changed out the ecm still a blown fuse. changed out relays still blown fuse. unplugged fuel pump, fuse blew while cranking.

 

 

A short for sure, could also be a shorted out sensor. Get your hands on a OBD2 scan tool and grab any codes that are present.



You blew the fuse with the fuel pump relay out so that rules out your fuel pump relay, fuel pump, downstream (rear) 02 sensor and fuel pump check connector.





Engine control relay ties into almost everything else, You should turn the engine over with that relay unplugged, if the fuse doesnt blow then we know what sensors (or there wires) to start looking at.

 

Traded him a 2000 silver Tiburon with 140k miles last night. Got this car figured out in about 15 minutes. I made a circuit breaker that plugs into the ECU fuse slot and started it up. Smoke came bellowing out of the engine bay, and I shut it off immediately! The Oxygen sensor wiring was messed up and shorted out. Easy fix. Wish I didn't trade my Silver auto for it, going to be fun trying to sell a car with a salvage title Not his fault though, I could have backed out but wanted the challenge!