How to I reset my ECU

[tempragolf]

How do I go mabout resetting my ECU? If the battery is disconnected, will my radio need a code before it will work again?

Ta in advance

P

[mjb]

How do I go mabout resetting my ECU?

Personally I just unplug it for a few seconds. The recommended way is to disconnect the battery for half hour or so.

If the battery is disconnected, will my radio need a code before it will work again?

depends on your car:
D8 - yes
D9 - no

[tempragolf]

Tried disconnecting battery for an hour but it didn't reset! When I owned a Fiat tempra, which also had a Magnetti Marelli ECU, I had to "start engine (don't touch throttle)then wait until cooling fan comes on and off twice then switch off, disconnect battery and wait 20 mins. Then reconnect battery, start engine (don't touch throttle)and wait for cooling fan to come on and off twice then switch off. Upon restarting it would then be reset. Does this work for my Pug I wonder...

[teamster1975]

Have a read through this KB article.

[lozz]

Some cars will take longer than 20mins to drain,
ive found in the past by putting the headlights on before taking the - lead off the battey helps to drain power,
dont know if thats safe practice on the D9 406s tho they seem abit sensitive B.s.i wise,

!!Never just put the lead on and start a 406 straight away, its not worth the risk ,

[leestudd30]

So if you were to connect an aftermarket amp which connects to a terminal on the battery, would you still have to follow the procedure on that link? What happens if you don't?

[lozz]

So if you were to connect an aftermarket amp which connects to a terminal on the battery, would you still have to follow the procedure on that link? What happens if you don't?

As a Guess mate, ithink its alldown to avoiding Spike.
iwouid follow the Bsi procedure just as a precaution, theres no clear fact that Adding stuff will cause damage but it happens,
for something that takes 5 mins to do couid save your car inthe long run

[leestudd30]

Thanks, will definately do that! It says remove DIAG if connected, what is it referring to?

[lozz]

Thanks, will definately do that! It says remove DIAG if connected, what is it referring to?

Your 406 is it a D8?

[Doggy]

Thanks, will definately do that! It says remove DIAG if connected, what is it referring to?

If you have it connected to diagnostic computer, pull the plug out first........

[leestudd30]

Yep, its a D8! Where can I find that plug?

[Doggy]

On a D9, it's behind the cover next to the headlight height adjuster - on a D8 it's in a similar place, possibly behind the fusebox lid?

(If you haven't got it plugged into an external diagnostic system, you don't need to do anything).