hello peps,

my sister has a mk5 fiesta 1.4. her boy friend jumpstarted it with the terminals the wrong way and now it wont start. could anyone give me pointers in what could be wrong?
the more help and details the better.

many thanks to you.

 

, when you say it won't start does it turn over? If so then the ECU may possibly be damaged.

Martin

 

im gonna go and try it now.

 

ok,so he's changed the ecu, immob and ignition barrel. all the lights come on but doesnt turn over?????

 

Fuse for the ECU in the engine fusebox. PATS light will not be on (in the clock) if this fuse goes.

 

Starter motor fooked?

 

Did this once with my Clio and a classic mini, melted jump leads by time I realised, someone used wrong colour cables on the mini.

All was fine though.

Doesn't help your case.

 

Firstoff, give her boyfriend a slap, then chek all fuses, chances are it's just popped one.

 

right, iv checked the car and the pats light is off and i cant find any faulty fuses, any ideas please? is this fuse for the ecu hidden?

 

Have you checked the starter?????????

 

what made you want to jump start it in the first place? i ask as you may have done no damage putting the leads the wrong way round it may just be the original fault is still there, have you tried push starting it?

 

the battery was dead,i havent touched the car but they have split up and shes asked if i can fix it.the lights come on in position two but doesnt sound like the fuel pump primes and it wont even try to turn over

 

There may not be enough juice in it to do anything else, lights don't really take much to run. Bung another battery on and see if that solves it.

 

try bump starting it

 

1 of the boys done this on his clio sport, needed a new loom, terminals and ecu.

Could be possible wiring damage

 

If the pump doesnt sound like it working give the tank a bang underneath, sometimes works sometimes doesn't, use your fist or a bit of wood or something though not a hammer

 

thanks people, does it matter the PATS light isnt on at all?

 

The fact that the PATS light does not illuminate at all indicates that the ECU is not receiving any ignition feed.

I had this on my Fiesta 1.25 with the Siemens ECU. Started the car up with a low battery level, it ran and moved about 1 foot then stalled. The alternator had spiked (similar to your problem) and shorted the ECU internals which had blown the ignition fuse in the engine bay. Double-check your fuses in the engine bay.

 

is it a special fuse?i check every single one in the fuse box in the engine,nothing was popped

 

Check fuses behind the glovebox.

Martin

 

changed the battery?? Sounds like there isnt enough power.

 

right peeps, iv checked all the fuses,changed relays and still had no joy. anything i havent done people can suggest please?

 

Still suspect the ECU myself, you could check power is reaching it?

Martin

 

yeah i think i might need to get a battery for it,just to rule that out.then test the ecu. bloody cars

 

Does it bump start?

if it bump starts its somthing to do with the starter

 

It's hardly the cars fault though ?

And it is pointless doing anything unless you know you have a fully charged battery


If the ignition lights all come on the dash as normal, then there should be enough power that you would hear the fuel pump prime.
But by connecting the battery wrong, all sorts of damage could have been caused in the vehicle electrics.

How much is the car worth ? And are there any decent auto-sparks near you ?

And are you sure the vehicle isnt immobilised either by a factory system or aftermarket, either of which could have been fried too.

 

Just to say that I connected my jump leads round the wrong way and most of the dash lights went out and the car wouldn't start. Turns out that I'd blown the grey 3 amp fuse in the fuse box, replaced and all was well

 

7 years on i'd hope its been sussed