Resetting ECU?

Hey there when you refit the battery cable on the vehicle, then go back to the ignition and turn it one click over that will show all the lights on the dash. Wait with the bonnet open and u will hear a few bits moving and clicking then after a little while u will hear a BEEP from under the bonnet and your ready to start up the vehicle

hope this helps

crazy-steff said:

found this thread on a search, was wondering if i have to switch the ignition off before turning the car back on and driving after doing the process and do i have to leave the car running for a while with out touching the throttle before setting off!?!


Reset the ECU (adaption)

The car must have a cold engine i.e have been standing for a while (say first thing in the moring or late at night after it's cooled)

Take of the positive battery connection (single 10mm bolt is loosened and clip raised - jam an insulator in there to keep it away form the terminal) leave for 5 mins or so or cup of tea time .

Replace connection.

Next bit is important (you may want to practice this once before anything is disconnected). Put they key in and switch it to the ignition setting which does not turn the car over, but activates the auxillary electronics - fan etc. Leave it like this for 3-4 mins. This is a throttle adaption process.

OK. go drive. You should notice a difference.

Click to expand...

There are a few untruths in that thread
First it's the negative terminal you want to remove
There is no beep afer the ECU has been reset
Best to leave the -ve terminal off for 30 mins not 5
When starting the car after ECU has been reset just turn the key one click, leave for 2 mins and you can either start of now doesn't really matter

Where did you get this info from?
EDIT

This does not do a throttle body reset either, this can only be done with VAG com

So that post was total shite

Junior Senior said:

There are a few untruths in that thread
First it's the negative terminal you want to remove
There is no beep afer the ECU has been reset
Best to leave the -ve terminal off for 30 mins not 5
When starting the car after ECU has been reset just turn the key one click, leave for 2 mins and you can either start of now doesn't really matter

Where did you get this info from?
EDIT

This does not do a throttle body reset either, this can only be done with VAG com

So that post was total shite

Click to expand...

^^^^^ What he said

if u had a remao or chip , would this process wipe it off ,

what is the reason for resetting these then

cheers

no.

some points:

make sure you have the radio code before doing this, you will most likely need it.
remove negative terminal, not positive. (10mm) spanner required. dont let it touch body of car.
leave for few mins.
reconnect negative terminal.
turn on ignition, (dont start car) - leave for 5 mins. (im not sure leaving it for 5 mins does anything, but what the hell do it anyway.

start car.

It will not have reset the ecu, but may have reset some parameters or adaptation and some minor intermitent fault codes may clear depending on the reason for the fault.

It wont do a throttle body alignment.

crazy-steff said:

im sure i found this info from a search on this site, i thought that i could also do a TB alignment with this!!!
cheers for the info though.....

Click to expand...

We all used to think this but it's incorrect


VAG com only I'm afraid

whats the point in this whole process someone? i'm confused

basically its to clear any adaptation, or minor fault codes only.

so i disconnect the NEGATIVE terminal? i did this once a while ago but cant remember which i removed??

yup negative for 30 mins voila....

radio code though make sure you have it matey

Can someone confirm the proper procedure for doing TBA with VAG-COM?

I have a toledo V5 which it doesn't mention in Ross-Tech website, but I think it might be the same as the Leon? Don't want to mess it up though

It states:-

Procedure for performing a Throttle Body Alignment on DBW Cars using KWP-1281:
(Check to see if the engine speaks KWP-1281 by looking in the top left of the Open Controller Screen Some examples of KWP-1281 engine controllers are 2000+ Golf/GTI/Jetta/New Beetle/Audit TT 1.8T)

Turn the key on but do not start the car.


[Select]
[01 - Engine]
[Measuring Blocks - 08]
Group 060
[Go!]
[Switch to basic settings]
Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
[Switch to Meas. Blocks] button and you're all set.

Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

As long as it all tallies up mate, you should be fine.

Ok thanks mate.