Help with reset ecu

[chillcupra]

I am complete novice when it comes to cars. Could someone please produce a dummy guide into reseting ecu by disconnecting battery or the easiest way. Could reset the ecu delete revo. Thanks

 

[stoneyfordNI]

it wont delete revo ,
window down,pop bonnet retain keys ,
lift bonnet , remove battery cover ,

use a 10mm spanner/socket and remove a battery connection and move away terminal from battery , it will spark , no shock risk , leave bonnet up and wait 20 mins or so , i always leave a window down incase when u reconnect battery the doors lock ( did on my pug -phew for spare key) after 20mins reconnect battery close bonnet recode radio ,away u go

 

[andycupra]

as above

agreed it wont lose revo.
make sure you have your radio code first

 

[chillcupra]

which wire do I remove, I am a complete novice. Is it risky??? Do you have to put revo back in performance mode?

 

[stoneyfordNI]

doesnt matter , i always take of neagative for some reason, i have custom code and i didnt have to re activate it after am sure revo is similar

 

[paul26982]

can i ask, why do you want rid of revo

 

[stoneyfordNI]

he doesnt , he's scared it will delete when he disconnects the battery

 

[paul26982]

or right, DERRRRRRRRRR ME!

 

[chillcupra]

I dont, I want to reset ecu becuase car feels slow at the mo. Sorry for sounding thick but which is negative wire (colour)

 

[stoneyfordNI]

ermm ..it'll be labeled with a (- ) on the battery and will be black , it doesnt matter which one u remove , juat make sure if u remove both ( no need to ) u dont mix em up

 

[chillcupra]

Right I have just to bat cover off to have a look. On the left there is a big red wire(+) in the middle there are a few smaller red ones and a black. Then on the far right there is a big black(-) one. I take it this is the one to remove??? Also how long should i leave it dissconected and what should i do once its re-connected - Start car straight away??

Thanks

 

[cordobabrendy]

phil read the second post, take one of them off and leave it off for 10-20 mins.

 

[andycupra]

yes remove the wire which is nearside.
or on the right when look into engine bay from the front of the car.

not dangerous if you can avoid touching the negative and positive at the same time!
20 mins is plenty to leave it dissconnected.

revo should still be in place when you reconnect.

 

[paul26982]

****ing chocking lads!

 

[stoneyfordNI]

****ing chocking lads!

 

[Mitchy]

Nope dont start stright away.

Connect the terminal and leave for about a minute, you'll here a high pitched buzzing sound, this is your throttle body re-alligning itself!

Dont start until the buzzing sound has gone

 

[stoneyfordNI]

its a diesel , no TB

 

[andycupra]

****ing chocking lads!

????????????????????????????????????????????????????????????????????????????

 

[stoneyfordNI]

why is there still confusion in this thread ,

wheres the broom

 

[Hairy]

doesnt matter , i always take of neagative for some reason, i have custom code and i didnt have to re activate it after am sure revo is similar

Just for my pennies worth...

You should always take the negative off first (at least on a negative earth car) to prevent you from shorting out the battery by accidentally letting your spanner touch the engine\body work while slackening the positive terminal. When re-fitting it's obviously the reverse so fit the positive first.