Help! Seat ibiza ecu conflicting advice!

[seatibiza2000]

I hope someone can help...

6 months ago my Seat Ibiza 1.9 SDi Cool (X reg) developed an intermittent fault with the accelerator pedal sensor (you put your foot on the gas and nothing happened). We had the sensor replaced but the fault continued....we then discovered that the ECU had been water-damaged (fortunately water damage was limited to the ECU itself and all connectors etc seem OK).

We sent the ECU away to be re-built, refitted to the car and for 6 months there were no problems... until 2 weeks ago when the fault returned.

We sent the ECU back to the specialists who analysed it, re-built it and returned it to us. The ECU specialist has said that he detected corrupt code within the ECU which was caused by the immobiliser - he has recommended by-passing the immobiliser and has said that this will solve all issues - if we simply re-fit the ECU without by-passing the immobiliser the same error may occur.

I’ve since spoken to lots of different auto-electical specialists who all say you can’t by-pass the immobiliser, but my ECU specialist says you definitely can!!

Any ideas how to proceed or anyone had a similar issue?

Many thanks in advance!

 

[NOS EXUP]

Did you get a solution for this problem ?

My Seat Ibiza 1.9 sdi has developed a similar problem - accelerator position sensor (18047) with flashing glow plug lamp - no throttle - limp home mode

Anyone else had this problem ? can it be water near ECU / Poor connections or accelerator pedal sensor itself

Any ideas ?

thanks

Nick

 

[leanski]

hmm

not sure if its same problem with my ECU?...just spent £400 trying to get it sorted...first spent (£125) getting a new air flow meter...(wasnt that) ...then got cam sensor and leads going to ECU replaced and coil replaced (£300) no luck...they said they could send off ECU to be looked at but in the past they have come back all clear and still not worked/or have worked. hit and miss for another (£100 minus labour)...was running it for about a week after cam sensor was fitted at first kept jerking all over the place...but then after a day or so ran like a dream?!...now....revs started jumpin from 4000 to 0 to 2000 to 0 again...so maybe it is water getting into the ECU since this has only happened since the snow has been piled up on my car/ since cleared. someone i know who owed a mark 2 ibiza told me you can get ECU that doesn't have to be remapped at an alright plrice/cheap? any ideas? i don't know if to give up spending money? mine is a (seat ibiza 1.6 sport X REG by the way)

 

[crespo1987]

had the same problem, solution new ecu + inmo off by chiptuner

 

[Seatmann]

Now before you go throwing money at an ecu or someone to fix it try doing it yourself. I had the exact same problem with mine on the cordoba, the one that looks like a Mk3 ibiza estate. Anyway replaced the sensor and nothing, fault still there, took out the ecu and opened it up. There was white corrosion type crud shorting out the pins where the big plugs go in. I used a soft brass wire brush and cleaned the main board up, got rid of the corrosion etc. I then let it sit in front of the fire to dry out, a heater will do. Also bake the casing to dry it thoroughly but not to hot as you don't want to melt it. Once it's totally dried out clean it up too. Once that's all done get a tube of the clear silicone sealant, the kitchen and bathroom stuff and use it to seal the ecu back together, around the plug end and everything. Screw the casing back together and then smear the outside of the casing with silicone too, the casing seems to go porous with age and the silicone seals it all up.

Now refit and try it out, mine never failed again in the two years I had it and I live up in the hills where the weather tends to be a bit dramatic.

 

[crespo1987]

Now before you go throwing money at an ecu or someone to fix it try doing it yourself. I had the exact same problem with mine on the cordoba, the one that looks like a Mk3 ibiza estate. Anyway replaced the sensor and nothing, fault still there, took out the ecu and opened it up. There was white corrosion type crud shorting out the pins where the big plugs go in. I used a soft brass wire brush and cleaned the main board up, got rid of the corrosion etc. I then let it sit in front of the fire to dry out, a heater will do. Also bake the casing to dry it thoroughly but not to hot as you don't want to melt it. Once it's totally dried out clean it up too. Once that's all done get a tube of the clear silicone sealant, the kitchen and bathroom stuff and use it to seal the ecu back together, around the plug end and everything. Screw the casing back together and then smear the outside of the casing with silicone too, the casing seems to go porous with age and the silicone seals it all up.

Now refit and try it out, mine never failed again in the two years I had it and I live up in the hills where the weather tends to be a bit dramatic.

i will try tomorrow! because in "the broken one" i have a stage 2 map!

 

[Seatmann]

Might as well, just don't where anything fleecy that gives off static when touching the main board lol

 

[crespo1987]

Might as well, just don't where anything fleecy that gives off static when touching the main board lol

 

[leanski]

Now before you go throwing money at an ecu or someone to fix it try doing it yourself. I had the exact same problem with mine on the cordoba, the one that looks like a Mk3 ibiza estate. Anyway replaced the sensor and nothing, fault still there, took out the ecu and opened it up. There was white corrosion type crud shorting out the pins where the big plugs go in. I used a soft brass wire brush and cleaned the main board up, got rid of the corrosion etc. I then let it sit in front of the fire to dry out, a heater will do. Also bake the casing to dry it thoroughly but not to hot as you don't want to melt it. Once it's totally dried out clean it up too. Once that's all done get a tube of the clear silicone sealant, the kitchen and bathroom stuff and use it to seal the ecu back together, around the plug end and everything. Screw the casing back together and then smear the outside of the casing with silicone too, the casing seems to go porous with age and the silicone seals it all up.

Now refit and try it out, mine never failed again in the two years I had it and I live up in the hills where the weather tends to be a bit dramatic.

was this info for me?...because it sounds like a damn good idea! its really does just sound like this...it was jutterin about for few days after it rained heavy over xmas so...always when its rained/snowed it messes up! cheers for the info...great stuff...i just got to work out where the ECU is now?? i really haven't got a clue...

 

[leanski]

oh....just looked it up...either behind the battery or behind the dash is where the ecu is located...but my car is an x reg so behind the battery sounds more likely...

 

[Seatmann]

X reg Mk3? It's under the plastic trim at the base of the windscreen, that's why they get so dam wet because they're in a stupid place.

 

[leanski]

yeah x reg...mark 3...(i think it is yeah)... is the ECU difficult to get to?...need any special tools? (+ do i have to re-map/programme ecu after ive taken it off?) your discription of how to do fix it sounds good to me...

 

[leanski]

yeah mark 3...its the same as this just a 1.6 sport http://collinsperformance.com/wp-content/uploads/2012/01/Ibiza-Mk3.jpg

 

[Seatmann]

No fancy tools required at all and it doesn't need any programming. Just be careful not to zap the circuit board which is why I said not to wear anything fleecy that causes static.

It'll either work or it wont but if the worst comes to the worst it should be fairly cheap and easy to get another ecu. I bought my last one for the Mk4 golf for £50 off ebay.

 

[leanski]

cheers mate...i'll let you know how it goes....

 

[leanski]

right...took off the ecu...took it apart...was sealed brilliant! looked brand new inside (obviously could still be damaged) so i plugged it back into and my car and the car won't start now!...guess it might be battery because i unplugged it all first/left it a few days in minus degree weather?...but anyway, my friend told me to get a 'blue temp sensor'..just ordered one off a mate (£10)...nice!....will plug everything back in 2moro and see how it goes ( damn i hope it works >:-(!!! ) overwise will have to buy a cheap run around...i need car for work you see...i'll let everyone know how it goes...hopefully it will work and help someone else on here fix any problems they have too...

 

[Seatmann]

Why wont it start? What's happening?