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Old 03-07-2007   #1
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Punto JTD ecu reset

How do i go about resetting the ecu? I know i have to disconnect the battery for an hour but what are the procedures for starting etc?
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Old 03-07-2007   #2
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Re: Punto JTD ecu reset

just use the car as normal the ecu will adjust to your driving after a few hundred miles so mpg and performance might be a bit off
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Old 03-07-2007   #3
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Re: Punto JTD ecu reset

Do i have to let it idle for five minutes on restarting or anything like that?
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Old 03-07-2007   #4
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Re: Punto JTD ecu reset

no. the ecu just resets to the factory settings
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Old 04-07-2007   #5
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Re: Punto JTD ecu reset

Quote Originally Posted by toad101 View Post
no. the ecu just resets to the factory settings
What makes you think that?

http://forums.puntomk2.co.uk/showthread.php?t=7596


To reset an ecu, put the key in the ignition set to on but the car not started, disconnect both battery terminals and with a spanner if not enough slack touch them together, this will complete the circuit and remove all electrical energy within your cars ecu (the alternative is to disconnect and leave overnight...).

You then reconnect the battery. you start the car and do not touch the pedals while the engine get to optimum temperature (wait for the rad fan to come on the second time) you then switch off.

Switch on again and you can drive the car however keep the revs below 4,000rpm for the first 20 miles as you need lambda settings to map the higher rev range... after 20 miles the car is now reset and you can drive it as an italian car should be driven.

(if you thrash from the go, after 4,000rpm the ecu cannot read the emmissions so will go lean most likely)
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Old 04-07-2007   #6
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Re: Punto JTD ecu reset

hi this is prob a stupid question but what is the point in doing all this?
cheers
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Old 04-07-2007   #7
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Re: Punto JTD ecu reset

Good question.

On some cars the ecu can adapt enough to advance ignition timing and add more fuel like a remap would for your engine mods, but on some the ecu is so well developed it doesnt leave much room for mods.

In essence it makes the car perform better if something has changed.

However a live remap will yeild much better results as the ecu reset can only do so much where as moving the barriers further (what a remap would do) is obviously better...
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Last edited by Lowtechguy; 04-07-2007 at 16:39.
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Old 04-07-2007   #8
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Re: Punto JTD ecu reset

okay thanks alot mate. so if i just took the connections off for the battery and put them on in the morning this would help then?
if it does ill prob do it tonight and then put them on tomorrow.
cheers mate
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Old 04-07-2007   #9
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Re: Punto JTD ecu reset

Did you not read the procedure?
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Old 05-07-2007   #10
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Re: Punto JTD ecu reset

yeah i did.. thats what i ment im going to follow that and do it.
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