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Technical Phantom Faults 1.6 mw

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Technical Phantom Faults 1.6 mw

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roy lovelock

fiats = frustration
Parked in the garage Written a guide
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Hi guys / gals.
Im being slowly driven mad by my wifes mw, im now seriously thinking the ecu may have died.

Anyways, a few moth back the battery failed - down to 9volts - we had engine faults galore (everything light up lol), so i duely replaced that and thats when the problems started occuring.

First of all the car went to three cylinders, after diagnostics cylinder 3 was missing, so i cleared the fault.... fine the car went back to normal???,

that was fine for a week or so then the mrs rang me at home saying it had stalled and wont start (sounded like a dead battery with slow starter motor), any ways i told her about the ignition on off 3x and volia the car started. I placed the car or diagnostic again thinking maybe another coil (the original failed one is still in the car and working),
diagnostic read cam shaft sensor fault???? stored but not active???

cleared....

following day same again.

next day cat failure. (no signal)

then abs failure (no signal)

then loose connection (cleaned the connection block under the battery).

abs, cam cat lose over and over again......

the car is running fine.

So today i went out to yet again clear the faults, none found???!?!?!?

the desplay is constantly bleeping and flashing engine fault but nothing is showing on diagnostics.
Actually atm the car is driving nicer than it ever has before it feels like its got some guts now but that constant bleeping over and over again drives you nuts.

Has anyone got any idea where to look now or do you think its a case of failed ecu and just purchase a new virgin unit.

many thanks for you help my wife may not leave me if i can get to the root of this major annoyance.
thanks
roy
 
roy lovelock said:
Hi guys / gals.
Im being slowly driven mad by my wifes mw, im now seriously thinking the ecu may have died.

Anyways, a few moth back the battery failed - down to 9volts - we had engine faults galore (everything light up lol), so i duely replaced that and thats when the problems started occuring.

First of all the car went to three cylinders, after diagnostics cylinder 3 was missing, so i cleared the fault.... fine the car went back to normal???,

that was fine for a week or so then the mrs rang me at home saying it had stalled and wont start (sounded like a dead battery with slow starter motor), any ways i told her about the ignition on off 3x and volia the car started. I placed the car or diagnostic again thinking maybe another coil (the original failed one is still in the car and working),
diagnostic read cam shaft sensor fault???? stored but not active???

cleared....

following day same again.

next day cat failure. (no signal)

then abs failure (no signal)

then loose connection (cleaned the connection block under the battery).

abs, cam cat lose over and over again......

the car is running fine.

So today i went out to yet again clear the faults, none found???!?!?!?

the desplay is constantly bleeping and flashing engine fault but nothing is showing on diagnostics.
Actually atm the car is driving nicer than it ever has before it feels like its got some guts now but that constant bleeping over and over again drives you nuts.

Has anyone got any idea where to look now or do you think its a case of failed ecu and just purchase a new virgin unit.

many thanks for you help my wife may not leave me if i can get to the root of this major annoyance.
thanks
roy
Click to expand...
Hi, I can you give you an advice just on the ABS failure. I had this from time to time and the problem was that there was too much dirt between the sensor and the wheel bearing, cleaned that up and no problems since then. Mine is a 1.6 MW too. As for the other faults I think it would be a poor connection somewhere. Did you clean that D4 connector in the battery compartment?
 
thanks guys, ive done the d4 connector, but will do that again, i will also grease up the earth to see if that makes any difference.
i think it maybe time to let the old girl go as she is becoming more hassle than she is worth - but ive got to get her fixed first though...

I cant understand why engine fault is constantly (every 2 seconds now) bleeping without no stored codes

any other ideas??
i will keep you posted on what i find, maybe a trip to the stealers is the only option :(.
roy
 
From your symptoms I'd check out the ECU earth C40
O2 sensor connected to ECU
Cam sensor connected to ECU
ABS goes and sulks if its friend the ECU drops out

If ECU is disconnected then you may well get engine fault and no fault codes and ECU is reset so it may well run better

I'd also disconnect every one of the battery pos connections and clean up if you haven't already done so
 
volxstu said:
Must be a faulty earth imo. Have you had any problems with the starter motor not turning?
Click to expand...

turning slow when cam shaft sensor fault. after the three x ignition trick it comes back to life.

deck (nice to see an old face or two still on the board lol) where is that lead on the battery or in some obscure place?

thanks for your help ive got a few things i can now look into.

My wife text me about an hour ago and asked if i could turn the bleep off as she loves the car now (it actually moves pretty quick lol) - my conclusion is all the bells and whistle of the computers slow the things down.
 
ok i cleaned up all the earth and +v connections, sprayed up ecu connections along with everything else i could find inclluding d4. removed the compressor switch connection (air con disconnected as belt broke ages ago and gas leaks out), still nowt.

So i decided to pull a coil pack to spark up a fault, volia p0340!!
and p1300? is that the same fault?

but if i leave this fault present it only bleeps once and drives normally so atm ive left the induced fault live.
as soon as i clear the mil flashes and bleeps constantly.

how do you go about resetting the ecu with fiatscan? i can see the proceedure but dont want to bug it up.
thanks guys you have helped a lot but still no dice

Ive removed the battery for now to see if that will trick the ecu, i have my fingures crossed...
roy
 
The old gits are holding the fort here so it's nice to see fresh faces too:)

1.6 ecu earth checking.JPG
Earth C40 is the black wire shown bottom left of the ECU mount bolts here but what I would do first is a voltage drop test from the ECU body all the way to the battery earth terminal like I'm doing here. Especially when it's playing up, look for sudden voltage rises from nothing as it loses earth. Once you're sure that's ok then you need to check that earth connection is getting up to the ECU connector by back probing the ECU connector earth line compared to battery earth

The positive terminals that I would clean up are all at the battery positive post, just simply take all the connections apart one at a time there, wire brush them and use contact cleaner and it can cure a lot of intermittent voltage faults
 
Last edited:
The p0340 is cam positon sensor again and P1300 is the toothed wheel, presumably the rpm sensor pick up ring and it's sensing out of synch/loss of signal

I think I would investigate a suspect loss of earth to the ECU which might be at the ECU connector or even between the ECU connector and the ECU circuit board. Do a wiggle test of the ECU connector with the engine runnng and see if you can make things happen
 
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excellent thanks for those lasts posts, i had to go to work but now ive got something i look into tomorrow if the kids give me 5 mins during the day.
i will keep you posted on what i find.
Thas reallly strange that cam shaft sensor has picked up when i deliberatly induced a fault with the coil pack to see if i can spark life into the fault pages.

Im gona run a fesh earth lead directly to check tomorrow and see if that brings her back to life.
cheers
roy
 
done that but no banana!

ive left the car active now as its running fine but with a coil pack falut active (induced to stop the constant bleeping).
the p1300 fault is still active and now im wondering if there is actually a failed cam sensor.
Am i correct in thinking its on the cam pulley under neith on the front side of the engine (spark plug side?)
i cant seem to find that part for sale on euro car parts does anyone have anywhere i can get a brand new one from (not ebay please).

It maybe a blessing in disguise as when we purchased the car it was sold to us as having the cambelt replaced, that cam belt is in no way 2 years old - i removed the cover to see if i could trace the connections to the cam sensor and noticed the belt is cracked badly - i will infact replace this at the weekend if i can get hold of a new sensor first.

as the cambelt is obviously worn could this throw the error on the sensor? im wondering if it has malformed over the years then this maybe the root of the problem, wadda think?.
cheers
roy
 
do you know what i think thats it, the belt may have actually stretched and the cams are out of alignment giving this fault (it doesnt seem as tight as it should be from experiance), these cars are so quirky even after owning one for 8 years now they still manage to catch me out.
i could probo realign the cams without removal of the belt but there is no point - she has only a few miles to do then i can whip it off and put a new conti on.
i will keep you posted if that resolves the issue.
roy
 
thanks mate, im gona do the cambelt first, as i have all the tools and its not a too difficult job im going to see if a new belt and realignment will do the trick first, if that fails i will change the sensor - once that fault has cleared i think its time to find a diesel for her.
thanks again
roy
 
I really don't think it will be the cam sensor itself, they're pretty robust and apart from physical damage they have a pretty easy life and, as you've found, are exhorbitantly expensive

I think you're on the right track for the P0340 and your crank to cam timing is going out of synch, enough to trigger a fault code, your visual check and deterioration of the belt tends to sound the alarm bells for an over stretched belt. They shouldn't be in that kind of state after just 2 years unless you're doing huge mileage

It'll be interesting to see if the new cambelt and proper timing cures it all
 
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i hope so mate, its been a bit of a headache.
the car was suppose to had the belt done a couple of days before we purchased it 2 years back - i know for a fact that that belt is no way new, the car is my wifes runabout and has only done 4k in 2 years so that would never knock out the belt.
Infact i checked my belt only last week - i had that replaced last year (well i done it) and the car has done 28k since it was changed and the belt still looks new - although i plan to change it later on in the year as a matter of course (with my abnormally high mileage every year).
i was probally striped up good and proper with that belt, but then again we only payed 1.9k for the car 2 years back so it swings and roundabouts - im pretty sure its still worth bout 2-2.5 k now.
 
SORTED!!!!!!

it appears i was correct the fault was because an over worn cam belt!
When i first started the car it still bleep at me, so i went back and checked the belt, bleep again, gave up and pulled the belt of again re timed and put it back on, bleep bleep bleep p1300 code AGGGGHHHH
so at this point i was swearing constantly and decided to just put the car back together and let fiat get some money from me
well i finshed the rebuild and started it up bleep bleep bleep, SHUT UP....
cleared my tools away and then started again to move the car back on the drive way, bleep bleep bleep.
showered then went for a test drive..... SILENCE!!!!!!!
pluged in fiat scan ecu NOWT!!!
the car has all its power back and goes like well it goes (not on par with my oil burner) but it has power again.

So i think ive found a new feature on the car, cam belt tester lol, it was a blessing though otherwise i may had never noticed that knackard cam belt until it was too late.
thanks for all your help

p1300 fault - check the cambelt!!!
roy
 
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