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96 Golf GTI ECU resetting

Posted By vwagain 2/28/2006 6:42:20 PM
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vwagain
 Posted 2/28/2006 6:42:20 PM
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Hello, newbie here with a questionSmile

Ive heard that the ECU can be reset to factory settings on the Golf Mk3 but has anyone got a clue how i go about this???  My car is a 96 GTI 8v.

Thanks, Stu

J Warden
 Posted 2/28/2006 7:02:49 PM
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Hi Stu

An engine number would help, but you can normally reset the ecu to factory settings but the procedure depends on what diagnostic equipment you are using, do you have a particular fault with your car,

John

vwagain
 Posted 2/28/2006 7:14:43 PM
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Hello John,  My engine code is AGG.  The problem is rough running on tickover and intermitant flat spots.  Ive had the cat checked out and its fine. I bought one of those cheap code readers from ebay and it has helped me no end with my ABS and Airbag and saved me much mularBigGrin but nothing comes up on the engine check!!?? 

The car seems to fly one day and the next seems to have nasty flat spots and runs rough on tick over? 

Stu

K And R
 Posted 3/1/2006 2:22:14 AM
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Stu

Use the search button above and put in AGG, you will find Crank sensor,s are Suspect on these engines due mainly to its positioning under the oil filter.

KEV.

"If you dont KNOW how it works, don,t try to test or fix it"

Crasher
 Posted 3/1/2006 4:20:13 PM
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Try the ECU relay first, it's in position 3 on the relay plate (main board top row, third from the left) and has the number 30 on top with the VAG number 165 906 381. They cost £10.35 from VW. If the one in there has a black case and was made in the Philippines, change it as they are chronically unreliable, the new ones have a grey case and are made in Germany or Portugal. A duff relay can prevent the ECU from showing any fault codes which suddenly appear when the relay is replaced. The AGG isn't as prone to idle problems as the previous ADY (the only difference is piston coating, cam profile and ECU mapping) and crank sensors do fail but always produce a fault code in my experience. I should imagine the throttle body is dirty and needs cleaning as well and this causes terrible idle problems.

Dark was that day when Diesel conceived his grim engine that begot you, vile invention...metallic monstrosity, bale and bane of our Culture, chief woe of our Commonweal- W. H. Auden

K And R
 Posted 3/1/2006 4:56:12 PM
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Crash.

You may be right but i have had several AGG,s no codes, start,s with flat spots etc, and ends up cutting out completely only to restart after a few minutes this can take months to get to the cutting outstage, But new crank sensor has always cured my one,s, oh by the way no codes on any of them so perhaps there relay was down as wellSmile does the relay only prevent getting codes?

KEV.

"If you dont KNOW how it works, don,t try to test or fix it"

Crasher
 Posted 3/1/2006 6:42:52 PM
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I've no idea why the relay stops the ECU showing the codes it has stored but it doesn't stop the live data so you can read the ECU voltage off on the relevant screen and I have seen it show as high as 48v, how that can be I don't know?

Dark was that day when Diesel conceived his grim engine that begot you, vile invention...metallic monstrosity, bale and bane of our Culture, chief woe of our Commonweal- W. H. Auden

vwagain
 Posted 3/2/2006 5:37:03 PM
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Many thanks for the help guysWink  I did clean the throttle body a while back and that did seem to help for about 1000mls. Ive also read about the relay issues and i think thats my next stepCool

But can the ECU be reset to the factory settings by simply disconnecting the ECU relay for say, and hour and then replacing it as i have been told?????

I almost forgot!! A few days after i first bought the car and on the drive home from work, the car started to tickover very low and wanted to cut out every time i let of the gas and i had to rev the gonads off it to keep it running!!!  I got about 1 mile from home and it finaly cut out.  I then started it again and it ran fine and hasnt done it since???? That was almost 4 months ago!!!!  But it has had the rough running and flat spot intermitantly since that day.  I think il get rid of all the nasty black relays and replace the crank sensor just to be safe!!!!!

Thanks once again,

Stu

3/2/2006 5:49:08 PM by vwagain
Crasher
 Posted 3/2/2006 7:00:51 PM
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If the battery is disconnected the ECU loses it's adapted values for lambda and idle so it will probably run worse. The only adaptation possible manually is the throttle valve.

Dark was that day when Diesel conceived his grim engine that begot you, vile invention...metallic monstrosity, bale and bane of our Culture, chief woe of our Commonweal- W. H. Auden

vwagain
 Posted 3/2/2006 7:15:24 PM
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Crasher (02/03/2006)
If the battery is disconnected the ECU loses it's adapted values for lambda and idle so it will probably run worse. The only adaptation possible manually is the throttle valve.

So how do i reset my ECU??????

Stu

3/2/2006 7:30:58 PM by Angus

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