DAVE26

is it safe to do an ecu reset on teh fly ???

i read on here ages ago that a guy used to do it but just wondered if it is ok to do it ???
i was thinking about joining the wires up to 2 switches for the reset....

thanks in adv

David_Wallis

I wouldnt recommend it... I have no facts as to why... just wouldnt do it.

David

DGRALLYING

how do you reset it anyway?

David_Wallis

there are two connectors under the dash that you join together... or leave the battery disconnected overnight..

David

Bitten Hero

You can't do this, as you have to turn the engine off after the reset has taken place ("Check Engine" flashes). It might stop if you remove the connections - I haven't tried it with it on, and wouldn't really recommend it...

Richard

DAVE26

to reset the ecu
you join the 2 black and the 2 green connectors together
start car and drive steadily till the check engine light comes on
then stop and turn car off and disconnect both pairs of leads
now give it a good thrashing

DGRALLYING

Call me stupid, but why does this have to be done???

DAVE26

well say for instance youve been running on unleaded
and you suddenly change to optimax
then i always do a reset, cos the ecu will set itself up to that fule, and retarded air intake n **** like that, so i always reset on every fill-up

DGRALLYING

Dave

So, do you notice the difference???

DAVE26

yes m8
straight away
try it
run ur car on unleaded for a full tank, but reset the ecu once you fill up.
then when your ready for a fill up
put optimax in and do an ecu reset
or just use whatever type fuel you use, and do the ecu reset

DGRALLYING

Dave

What black & Green Connectors?????????

DAVE26

ok, if you look under the steering column..
look hard cos sometimes they are taped up with insulating tape
you will find them
ill go take a photo

DAVE26

its a bit blurry but you can make out the black and green connectors

as marked

[Edited by DAVE26 - 4/20/2002 11:22:27 AM]

DGRALLYING

so, on my car that has a switchable chip witch does make a difference. will i have to do this after every time of switching it over????

DAVE26

dunno about that m8 ?!??!

David_Wallis

if you do it that often then I dont see why you couldnt put a push to make switch in line.. and hold it down to do the reset.. Have to be double pole though... wouldnt recommend pressing it whilst driving though...

David

MattRus

My five pence worth,
connecting the two pairs of connectors puts the ECU into a form of self test mode which in turn clears the temporary memory of gathered data (ignition, boost and fueling) for safe and in theory efficient running, ie. reset's everything to manufacturers defaults.
So connect both connector pairs (directly under the steering column), depress the accelerator pedal fully, release, then start the engine. After a period of time the check engine light will flash equally on and off signalling all has checked out OK.
Stop engine and disconnect the connectors. No change, then you had no 'de-tuning' data stored, some change ie. better pick-up etc. then you had some ignition retard due to knocking (running on unleaded, too much boost etc.!)

DAVE26

well said m8
but is it safe to do 1 on the fly

MattRus

Technically I can't see why not (anyone with first hand knowledge please feel free to correct this - Stephen@Ecutek?).
It would however need to be done when everthing is steady state and preferably off boost (ie. no load).

DAVE26

think ill fit the switches later 2day
mattrus....your email, do you have summat to do with ecu's
if so what am i looking at for my93 wrx to get more tings from her

and what exactly will the ecu give ?