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ECU reset...the official method

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ECU reset...the official method

Postby lightning » Fri Aug 07, 2009 5:31 pm

Well, here's the official line.
It's called a "Power Latch".
Warm up the engine to operating temperature.
Turn off the ignition, then turn it on again to position 2 (running position) DO NOT start the engine.
Open bonnet and REMOVE BATTERY POSITIVE LEAD with the IGNITION STILL ON.
Then you have to touch or short the positive wire (that you just took off the battery) to earth (still with the ignition on)
Turn off the ignition.
Reconnect the lead to the battery.
Start the engine and DO NOT TOUCH THE THROTTLE, let the engine warm up until the cooling fans cut in, or at least until the temperature gauge shows normal operating temperature. (Should not take too long as the engine was already at operating temperature)
Then drive normally, accelerating steadily up to 4,000rpm through the gears if possible.
This resets the ECU and it will then re-learn fuelling etc.
Does not take long as no need to leave battery disconnected for more than a few seconds.
Radio will need code entering and clock will need resetting.
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Re: ECU reset...the official method

Postby icengineering » Wed Jun 22, 2011 11:50 am

which transits does this work on??
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Re: ECU reset...the official method

Postby Mylee » Wed Jun 22, 2011 11:55 am

And does an ECU reset, clear remaps etc?
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Re: ECU reset...the official method

Postby matt_bailey » Wed Jun 22, 2011 6:06 pm

this may be a stupid question, but why might i want to do this?

Ive had the warning light come on now and again (like once a month max) and the codes come back to do with fuelling - would this be worth a try?
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Re: ECU reset...the official method

Postby WhoTheFunk » Thu Jun 23, 2011 8:00 am

#### Disclaimer required! :shock: #####

:lol: :lol:

seen things like this go wrong on forums before now!

Lightning where did you acquire that info? id be getting that verified by Coconut or someone else whos a ford Techie before you perform just in case....

If for any reason it was wrong you may regret it! if you have already done it with no consequences let us know the difference

I would perform this after my next service if indeed genuine as wondered how old is the map its running and how effecient it is.
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Re: ECU reset...the official method

Postby synchronicity » Thu Jun 23, 2011 11:18 am

For a minute there I thought you were saying to short the battery terminals.
Had to re-read that bit. :lol:
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Re: ECU reset...the official method

Postby Altransit » Thu Jun 23, 2011 8:37 pm

synchronicity wrote:For a minute there I thought you were saying to short the battery terminals.
Had to re-read that bit. :lol:

:lol: Yes, I did a double take at that bit :shock: :wink: :lol:
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Re: ECU reset...the official method

Postby bigbad mothertrucker » Thu Jun 23, 2011 8:49 pm

if this worked would it remove a speed limiter?
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Re: ECU reset...the official method

Postby Altransit » Fri Jun 24, 2011 6:16 pm

I think that re-setting the ECU simply removes old fault codes, it won't alter the installed software :wink:
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Re: ECU reset...the official method

Postby valetech » Tue Jun 28, 2011 3:35 pm

i know this works on bmw's
a friend of mine works at a main dealer,this is how they clear fault codes after repair
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Re: ECU reset...the official method

Postby lightning » Fri Jul 01, 2011 10:01 am

This old post has reappeared, sorry I've not replied...I have not been on the forum for a few weeks.

It came from a customer who is an engineer for one of the breakdown companies, he said it was the "official" method that they use for "most cars".

It only clears the ECU of "learnt parameters for the engine, and registered faults" The ECU re-learns settings when you next drive the vehicle, it usually takes about 10 miles before it's back to normal.

This is all information given to me by the engineer.

He said there are other ways to do it but this one is instant, with no waiting for the ECU to reset.
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Re: ECU reset...the official method

Postby retrofreek123 » Mon Mar 26, 2012 11:43 pm

would it hurt if you reset the ecu with your egr blanked off or not? also how long do you leave the lead off the battery for when they say overnight 8 hours min or??
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Re: ECU reset...the official method

Postby retrofreek123 » Sun Apr 01, 2012 9:01 am

Why do you mean stopped
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