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Gtir Motorsport club » Tech room » Help and Advice » fuse keeps blowing

fuse keeps blowing

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1 fuse keeps blowing on 21st August 2017, 8:26 pm

Stu

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Engine control fuse keep blowing.
Does anyone know what might be causing this?

Took all the covers off around the dash and gauges etc
But cant see anything wrong.
I have stripped the loom in my shell and started to trace the green and white wire and blue and silver wire to that fuse.
The green and white wire goes into a junction of other green and white wires. I havent traced all of those yet.
The blue and silver wire joins into another wire. One goes to a plug that isnt used. The other one has been cut and I haven't managed to find the other end as yet.
Its to dark to see now so will carry on tomorrow now.
Anyone else know where these wires go to?

Also the passenger headlight stopped working a few weeks ago and I couldn't find out why so I bridged the live off the driverside headlight to get it working.
Rob has said his fuse blew a few times when his headlight plug melted.
I have changed the plug on the headlight but it still wouldn't work.
So no live feed to it for some reason?


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2 Re: fuse keeps blowing on 21st August 2017, 8:49 pm

mike74

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Ive had this before on my last R when the maf wires shorted out and burnt a track in the ecu. I seem to remember a thick white wire going to the eccs relay next the the ecu from that fuse. Have you been rewiring anything at all apart from the headlight?
Just had a look at the ecu wiring diagram and that white wire also goes to the dropping resistor and maf too. You could try systematically disconnecting these and one by one plugging them in until the fuse pops again

3 Re: fuse keeps blowing on 21st August 2017, 9:04 pm

Stu

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Thanks Mike.
I will try this tomorrow Smile
I havent done any wiring. Only after this happened. .

Have you a link to the wiring diagrams please?


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4 Re: fuse keeps blowing on 21st August 2017, 9:05 pm

Stu

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Where is the dropping resistor?


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5 Re: fuse keeps blowing on 21st August 2017, 9:18 pm

Zia


Silver box with plug connector usually on n/s/f strut area or next to ignition amp.

Zia

6 Re: fuse keeps blowing on 21st August 2017, 9:27 pm

Stu

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@Zia wrote:Silver box with plug connector usually on n/s/f strut area or next to ignition amp.

Zia
Thanks.
I thought that was something to do with the injectors?
Mine is up by the afm as its been moved..


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7 Re: fuse keeps blowing on 21st August 2017, 9:40 pm

Stu

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I have just unplugged the afm and that other thing and the fuse still blew.
Un plugged the green relay next to the ecu and the fuse blew again.


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8 Re: fuse keeps blowing on 21st August 2017, 10:16 pm

mike74

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My phone doesn't want to play ball atm but ill fire it up tomorrow morning first thing Smile
Attachments
ECU Wiring Diagram complete.pdf
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9 Re: fuse keeps blowing on 21st August 2017, 10:16 pm

mike74

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Ah balls, it DID play nicely after all!

10 Re: fuse keeps blowing on 21st August 2017, 10:51 pm

Stu

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Thanks Mike Smile


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11 Re: fuse keeps blowing on 22nd August 2017, 11:42 am

Mr B

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If replace fuse does it blow straight away.
investigate engine fuse box and if no green corrosion or visual problem internally there visually look at loom run and concentrate on headlight wiring to start with. Does the fuse for passenger HLight have power and the first few inches of wire out to the headlight have power ? if so look at loom run for signs of damage, green corrosion or previous repair/mods and check for power at accessible locations .
I tend find concentrating on one known fault sometime finds or links to others for elec stuff like this, bit of luck and pretty standard tidy wiring makes life easier . Good luck .

12 Re: fuse keeps blowing on 22nd August 2017, 5:47 pm

Stu

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Thanks B.
I have sorted my headlight issue out.
Took the stalk off the steering colum and took it apart and cleaned the contacts and the headlight now works Smile
Its lazy some times so guess I need to replace it.

The fuse is still blowing and I've checked all Conect ions on underside of fuse box.
The fuse pops as soon as I turn ignition on.


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13 Re: fuse keeps blowing on 22nd August 2017, 6:02 pm

Spark plug spike

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Stu, I had an issue with that fuse blowing ages ago, turned out the lambda sensor wire had been rubbing causing the wire to short out and blow the fuse?

14 Re: fuse keeps blowing on 22nd August 2017, 6:19 pm

Stu

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@Spark plug spike wrote:Stu, I had an issue with that fuse blowing ages ago, turned out the lambda sensor wire had been rubbing causing the wire to short out and blow the fuse?

Spike you saying that. I was looking at my wire on that just yesterday and the outer casing has worn through on a few places.
I looked and couldn't see any of the wires worn through but will have a better look now you've said.
Thank you.


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15 Re: fuse keeps blowing on 22nd August 2017, 6:41 pm

johnny gtir

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Un plug it Stu should stop it if it's that

16 Re: fuse keeps blowing on 22nd August 2017, 7:31 pm

Stu

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@Stu wrote:
@Spark plug spike wrote:Stu, I had an issue with that fuse blowing ages ago, turned out the lambda sensor wire had been rubbing causing the wire to short out and blow the fuse?

Spike you saying that. I was looking at my wire on that just yesterday and the outer casing has worn through on a few places.
I looked and couldn't see any of the wires worn through but will have a better look now you've said.
Thank you.
Spot on mate. Thank you Smile Smile Smile

@johnny gtir wrote:Un plug it Stu should stop it if it's that
I have mate and fuse didn't blow Smile
Stripped the casing off the wires and they have been burnt by the manifold or turbo elbow and we're touching.
The wires Conected to the sensor are only on by a few strands so I need to get a new one.
Will it be okay to just keep it disconnected?
Thanks again everyone for the help Smile


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17 Re: fuse keeps blowing on 22nd August 2017, 7:47 pm

mike74

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Itll be fine. She'll just run a little bit rich thats all. Good find though:)

18 Re: fuse keeps blowing on 22nd August 2017, 7:49 pm

johnny gtir

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Most don't work anyway and only work up to 1500 or 2000 rpm I think mate

19 Re: fuse keeps blowing on 22nd August 2017, 8:26 pm

Spark plug spike

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@johnny gtir wrote:Most don't work anyway and only work up to 1500 or 2000 rpm I think mate

Mines been removed for the last 3 years and had no issues.

20 Re: fuse keeps blowing on 22nd August 2017, 8:41 pm

Mr B

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that was easy, good tip from spike ...

21 Re: fuse keeps blowing on 22nd August 2017, 9:00 pm

Stu

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I will leave it off then Smile
I have taped it all up. But want to remove it and repair it properly or replace it.
Thanks again everyone Smile


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