Author Topic: ECU RESET  (Read 9965 times)

Offline john boy

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ECU RESET
« on: October 09, 2008, 09:59:53 pm »
ECU RESET

The reset sets the ECU back to default settings. This means all duff info picked up from sensors etc is dumped.

First insure you have radio code (if applicable)

-disconnect battery for 10 mins
-reconnect
-turn ignition to second click and wait 10 secs
-start car
-turn fan to max, lights on and any other electricals you can (this sets alternator voltage drop)
-allow to idle until warm and fans cut in
-take for a blast

You may need to repeat if fault persists
 
 

Offline Goldie HDI

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Re: ECU RESET
« Reply #1 on: October 09, 2008, 10:11:54 pm »
barsteward!! I was just about to post one of these!!!


Offline john boy

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Re: ECU RESET
« Reply #2 on: October 09, 2008, 10:12:48 pm »
 :2funny: :2funny:
 
 

Offline Goldie HDI

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Re: ECU RESET
« Reply #3 on: October 09, 2008, 10:14:36 pm »
here's a more concise one

The engine must be "dead" cold (first thing in the morning..)
Ignition to "ON" (do NOT start engine)
Pull ECU socket and leave for a few minutes (say 10' for the record)
With the ignition "ON" plug ECU back
Make sure any electrical subsystem is switched "OFF"
Start engine and wait to heat up until fan spools up
Drive the car

Be aware that by resetting the ECU you will automatically dump any registered data that may contain information on a fault or malfunction. Anyway use at your own risk and good luck
« Last Edit: October 09, 2008, 10:18:42 pm by Goldie HDI »


Offline Captain Joe

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Re: ECU RESET
« Reply #4 on: October 09, 2008, 11:32:29 pm »
how come those two procedures are totally different?

and pull the plug on the ECU with the ignition on? that doesn't sound like a good idea  :-\

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Offline Goldie HDI

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Re: ECU RESET
« Reply #5 on: October 10, 2008, 01:41:11 am »
I found it searching the forum matey, one of the lads says a citroen mechanic suggested it


Richie1985

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Re: ECU RESET
« Reply #6 on: October 10, 2008, 05:45:18 am »
Just remember to be very carefull plugging the ecu back in  ::)

Offline The Wrinkly Ninja

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Re: ECU RESET
« Reply #7 on: October 11, 2008, 12:57:13 am »
No way am I pulling the plug on a live ECU. Reconnecting - maybe, but the back EMF surge through the thing on disconnect, would seriously frighten me.

And on the first one, the disconnect ought to be the earth lead first, and second on reconnect.
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Offline Captain Joe

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Re: ECU RESET
« Reply #8 on: October 11, 2008, 02:34:42 pm »
someone try it, and tell us what happens  ;D

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Offline Goldie HDI

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Re: ECU RESET
« Reply #9 on: October 11, 2008, 03:04:34 pm »
well volenteered Joe


Offline The Wrinkly Ninja

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Re: ECU RESET
« Reply #10 on: October 12, 2008, 02:49:59 am »
Did that first one several times as a BSI reset, when the remote lost it's connection.
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Offline Captain Joe

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Re: ECU RESET
« Reply #11 on: July 11, 2009, 04:56:32 pm »
so what is the proper way to reset the ECU? i've done the first one before but i don't like the sound of what goldie suggested  :-\

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Offline wheeler

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Re: ECU RESET
« Reply #12 on: July 12, 2009, 05:39:56 am »
I deffo wouldnt disconect or reconnect an injection ECU with the ignition on, asking for trouble, like you say big risk of back EMF & spikes. You shouldnt really even disconect the ECU with the battery connected, ignition should be off for a few minutes to allow the ECU to power down then disconnect battery before unplugging ECU.

Offline Baby VTR

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Re: ECU RESET
« Reply #13 on: April 26, 2010, 05:27:02 pm »
so, which is the correct way?  :2funny:
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Offline swiftie

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Re: ECU RESET
« Reply #14 on: April 28, 2010, 10:20:23 pm »
simply plug in a diagnostic tool, they all have a re-set funtion. but make sure it's the right one first.