2004 Jetta 2.0 gas won't start. Fuel delivery system good to the injectors. Pump primes, Fuse 28 is good. 409 relay is good. Engine cranks, runs 2-3 seconds & stalls and blows fuse 32 every time.
G28 engine speed sensor test 850 ohms off pin 1&2.
If the G28 sensor is bad does the ECM send a signal to fuse 32 to cut the fuel or is it a short somewhere also on the injector rail? I don't want to replace the G28 for no reason only to be back at the ECM or injectors.
I think it is safe to say that there is no design in your car that will allow the ECM to blow a fuse. Cutting power is done via relays.
There has to be a short. If the fuse doesn't blow when the key is on, engine is off, but blows when engine is running it's likely to be a bad fuel pump. I don't know what the codes represent and if you can't look them up and post them I'm certainly not going to.
The easy answer is that something that runs when the engine runs (i.e. fuel pumps) but doesn't run when the engine is off is what is blowing the fuse. I'd suggest you start with a wiring diagram and see what is fed by that fuse.
Also be sure that the fuse is properly sized...if someone stuck a 10A fuse where a 15A should go and you are blindly replacing it with 10A fuses (because that's what was in there) it will keep blowing.
Ok. I'm not experienced with electrical so I wasn't sure how the signal to stop the engine was delivered. Thanks for clarifying. Sorry for the lack of info on the codes. They are for the same problem on each of the cylinders.
P0261 Cylinder I Injector Circuit Low
P0264 Cylinder 2 Injector Circuit Low
P0267 Cylinder 3 Injector Circuit Low
P0270 Cylinder 4 Injector Circuit Low
The fuel pump works properly delivering fuel to the injector rail. The engine sometimes runs for 2-3 seconds before popping fuse 32. The size is definitely correct at 10 amp.
It must be a short from the injectors. Thanks for your help.