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Volkswagen Jetta, Golf, GTI: 1999-2005, R32: 2004 (A4) fuse 32 blows on start up and engine quits


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Last Post: Aug 4, 2013 10:10 AM Last Post By: tcovenant2000
FLCanuck

Posts: 1
Registered: 08/03/13
fuse 32 blows on start up and engine quits
Posted: Aug 3, 2013 12:08 PM
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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.
Codes
P0261
P0267
P0270
P0264

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.
tcovenant2000

Posts: 1,802
Registered: 12/09/03
Re: fuse 32 blows on start up and engine quits
Posted: Aug 3, 2013 2:12 PM   in response to: FLCanuck in response to: FLCanuck
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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.

Thomas
FLCanuk

Posts: 1
Registered: 08/03/13
Re: fuse 32 blows on start up and engine quits
Posted: Aug 3, 2013 3:20 PM   in response to: tcovenant2000 in response to: tcovenant2000
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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.
tcovenant2000

Posts: 1,802
Registered: 12/09/03
Re: fuse 32 blows on start up and engine quits
Posted: Aug 4, 2013 10:10 AM   in response to: FLCanuk in response to: FLCanuk
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Yeah. I'd look for short somewhere in injector circuit.
The way the ECM stops the engine is by not providing a signal to the injectors. No fuel = no running.

Good luck!
Thomas

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