Fuse 6 blows car wont start intermittant short circuit to gr

[jason406hdi]

Hi, this is my first time on this forum so hi to everyone! I hope someone can give some information on my problem!

Drove to London in all the snow on Monday, car fine and moved around several times that day. parked the car for about 6 hours and when I tried to u nlock with the plip key it would not unlock. Unlocked with key in door.

When trying to start the windscreen wipers are on intermittant and the dipped beam headlamps are on, engine fails to start. Icon on cluster of a key in a square and a message on the display saying electronic anti theft is defective. Engine spins fine but no start.

AA found fuse 6 in the car had blown, he replaced it and the car started immediately. All was working OK but about 50 minutes into the trip the fuse blew again (wipers on intermittant and direction indicators not working) but car engine was still running fine.

AA replaced fuse again but it blew, they fiddled with several things for about an hour then recovered me, fuse kept blowing immediately.

Today I have looked at the car and found the two wite wires from the fuse to be 0.2 Ohms to earth. The other side of the fuse seems to be constand +12V. Fuse blows immedately.

I have unplugged all the things I could find - Engine ECU, all plugs from box behind battery (BIS?) relays in little box beside battery etc. None of these remove the short to earth on the white wires.

I noted that with the ignition switch in position 2 the resistance increased to about 30 Ohms, I put a 10A fuse in and it did not blow, the car started immediately and operated correctly. The engine restarted several times OK, but then the fuse was O/C again and the white wire is short to ground even when the ign is in position 2.

I am now somehat stuck becuase I cannot trace the wire trough the bulkhead and I really need a wiring diagram to follow the path. I have a haynes manual for upto 2002 but I can't find the information I need in the schematics.

My car is a 2002 110hp HDi, it is the later type of car with the 3 plug engine ECU.

Can anyone comment on this and upload a wiring schematic for this car showing detail on the fuse 6 circuit?

Cheers,

[teamster1975]

Welcome Jason!
Don't have the HDi so I can't help you, what circuit is fuse 6 protecting?

[jason406hdi]

Now, that is a very searching question! :-))

I managed to get some access to the Peugeot web site and it seems like fuse 6 supplies 8605 otherwise known as the alarm sounder and horn, and CV00 which seems to be the "switch under steering wheel" which looks like some of the instrument cluster.

Unless there is a known issue I think it will end up down the garage, unless I feel lucky and try to burn out the fault with a bigger fuse!

[Doggy]

Which fusebox, Jason - engine, (under bonnet), or passenger?

[jason406hdi]

Passenger.

[jason406hdi]

Done some tracing today, the plug under the carpet was slightly corroded but no shorts or broken wires.

The white wires from F6 in the passenger fuse box go to the the corroded multiplug, splitting the connector shows the short is not on the fuse box end.

At the connector the wire changes to two yellow wires, one goes to the connector of the engine ECU, lifting this connector does not remove the short.

The other yellow wire dissapears under the dash, I presume this goes to the instrument cluster.

So it seem there is a problem there, turning the ign on to position 2 increases the resistance to about 25 Ohms again today, I think I can replace the fuse and start the engine in this case, that will at least get me to the Garage.

I have not tried pulling the clocks out, so we will see what the garage says.

Any suggestion sstill most welcome.

Good weekend to all.

[jason406hdi]

Unfortunately the garage could not start the diagnostics until nearly a week after the car was recovered, so as expected it has dried out now and the fault has gone :-(

I collect the car tomorrow and have some more long trips so I hope the weather stays dry!

Fuse 6 seems to supply a few other things like fuel additive pump but without a hard fault it can't be traced.

I will post again if there is new news but the car is currently up for sale (as it was before this issue) so it may be gone by then.

Thanks,

[andymo]

Hi
i seem to have got the same problem,it started with anti theft defective and wouldnt start lifted bonnet and changed a 10 amp fuse to the rear on near side of car and car started fine.After getting it running again it then flashed up anti pollution defective and runs in safe mode,after doing some digging around and talking to mate machanic that works on these as taxis says the problem now is the rear small tank that injects fluid ino the exhaust system has run low.Next step refill tank and have computer re set.This may be one of those trade secrets that the dealers can make a killing on if your not in the no.
Hope this may help someone else with this prob.