Hi, I'm wondering if anyone can help please?

I have an 05 plate L200 Warrior. For the past few months it will blow the 20Amp fuse on circuit number 11 (engine management). It does it ONLY under these conditions:

1. The engine is warm (driven 10 miles or so)
2. The engine is then turned off and left for AT LEAST 10 minutes.
3. The ignition is turned over (1 click) and blows 20Amp #11 fuse.

Please note: If engine is left for about 30 Minutes (i.e. probably cold or not as warm) the fuse will not blow and the engine will start happily.

From cold start the engine runs fine and drives happily 400 miles etc. It has never blown while driving. it only blows under the conditions above. If left to get cold again it will happily start again in the morning or once blown if left to get cold and fuse changed, it works fine, until you recreate the conditions above.

I have put it through ECU tests at Mitsubishi today and all is fine - no fault codes. My garage have ruled out the fuel injectors as we can still recreate this fault with them unplugged. They don't suspect relays (as they are not near heat source -engine?) and seem to click on and off fine. we suspect the fault lies between fuse (obviously!) and something in the engine bay that is shorting under dissipated heat when engine is turned off.

We know the car gives out 6 amps when all is fine, but when we recreate this fault it jumps to 40 amps and blows the fuse. The alternator blew a year or so ago...and then the second went faulty, but the 3rd is working fine and has been in operation several months before this problem occurred. (We're not even sure that the alternator is connected to this circuit or even related to this problem, but this is the only major work that has happened to the car during the past 3 years, so mention it)

Simply put, we suspect that either a wire or a component, when warm, is blowing the fuse but this does not happen when driving or when the car is left to idle. Its a needle in a haystack and very baffling and annoying!

What we really need is an electrical circuit for everything that connects to the Number 11 fuse. If not a drawing - a clear list of what should be on that circuit would be a great help from the wise gurus on this site!!!

Can anyone help please? Desperate with this problem and its been 2 months now and I (and garage) are tearing our hair out....and shedding money.

Thanks - Andy

take the ecu out and check it for any dammage the alternator overcharging may have dammaged something

did u check the tempreture sensors and wiring and the intercooler fan,

we will check temp sensors and intercooler...but that kicks in and out perfectly when running and when idling....also the ECU has been through diagnostics and is fine. What else is on the circuit? We really need a diagram...thanks -Andy

the intercooler fan should not really be running unless it is really hot mate I have never seen my running this time of year unless you are in Australia or somewhere

Quote: 123hotchef wrote in post #5

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the intercooler fan should not really be running unless it is really hot mate I have never seen my running this time of year unless you are in Australia or somewhere

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Hi 123hotchef, my mechanic says that the intercooler is not even connected in my truck, so its not that AND the ECU looks fine and the car drives very well, except for this fault. Do you know what else hangs off this circuit and can you find me wiring diagrams for it please? Andy

This link any use Andy

Online Classic Wiring Diagrams

It definetly sounds like a short to me, years ago I had a mondeo that would fail to start when warm sometimes ( usually just after you'd fill up with petrol ) . It kept knocking out the crankshaft sensor, well after 6 in six months I asked my mechanic if it could be a wring issue and he outrightly said no.... well to b honest I didn't believe him so stripped out the wiring to find two wires slightly stripped that would chaff together, fixed the wires and never had any more issues...........Just wondering if maybe your issue is a chaffed wire in the loom?

Quote: L200Andy wrote in post #7

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Hi 123hotchef, my mechanic says that the intercooler is not even connected in my truck, so its not that AND the ECU looks fine and the car drives very well, except for this fault. Do you know what else hangs off this circuit and can you find me wiring diagrams for it please? Andy

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Quote: ronniecabers wrote in post #9

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It definetly sounds like a short to me, years ago I had a mondeo that would fail to start when warm sometimes ( usually just after you'd fill up with petrol ) . It kept knocking out the crankshaft sensor, well after 6 in six months I asked my mechanic if it could be a wring issue and he outrightly said no.... well to b honest I didn't believe him so stripped out the wiring to find two wires slightly stripped that would chaff together, fixed the wires and never had any more issues...........Just wondering if maybe your issue is a chaffed wire in the loom?

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