Powertrain Module Fuse Blowing

[naroekie]

Hi

 

I have have problems finding the fualt that is causing the powertrain module fuse (F15) to blow on my 1998 Galaxy 2.8 4x4.

 

The car will run. I havce had it sitting on tickover in the drive for over an hour.

 

You can rev it nothing happens.

 

10-15 mins of driving and fuse F15 blows. Pop a new fuse in and it will last 5 more mins them blows again and will keep blowing until the car is cold.

 

At first I thought it was the powertrain module gone. But I have switched it with the one out of my other galaxy also a v6, and after resetting the PATS module I got it running fine. Started off on holiday next day stopped for fuel and 5 mins down the road the fuse blows.

 

Got an error code from vagcom saying MAF sensor open/short circuit intermittent

 

So I pulled the maf sensor plug off it and tried it but fuse blew straight away.

 

Anybody got any ideas?

[big_kev]

Got to ask the obvious first are you sure F15 is for the PCM ?

[insider]

F15 is for the engine cooling fan run-on relay which ties in with your symptoms, i.e. it doesn't blow when the engine's cold. Does the fuse blow when the fan kicks in?

Check for a short circuit / fault in the cooling fan circuit.

[naroekie]

According to all the wiring diagrams I have fuse 15 is for the ecm ( powertrain module )

 

Fans were kicking in and out no problem without blowing the fuse when I was testing in the drive.

 

Going to have to check the wiring diagrams again.