Resetting the ECU by Disconnecting the Battery
07 June 2003, 10:52 AM
#1
Scooby Regular
Thread Starter
Join Date: Feb 2001
Location: The Ghost Town. Drives RS6
Posts: 1,821
Likes: 0
Received 0 Likes
on
0 Posts
I have read the old threads on ECU reset by connecting/disconnecting wires located under steering column, but won't it reset by just disconnecting battery for an hour?
09 June 2003, 08:02 PM
#7
Former Sponsor
iTrader: (4)
Join Date: Jan 2001
Location: ECU Mapping - www.JollyGreenMonster.co.uk
Posts: 16,548
Likes: 0
Received 2 Likes
on
2 Posts
Very briefly..
1: On early cars they retard the ignition timing when knock detected and take a long time to advance it.
Newer cars are better and advance it pretty much as quickly as they retard it. So if you happen to get a bad batch of fuel and the timing is retarded due to this the early cars will take tank after tank full of good fuel to advance again.
Often feel a slight power increase after a reset as it returns the timing to base values.
2: on the newer cars the MAF sensor is more fragile and the ECU seems to compensate for a failing MAF sensor but eventually it cannot compensate enough and you run the car lean (bad).
If you reset the ecu and all of a sudden it runs rough then likely you had a MAF problem. Replace MAF and all is good again (original power back)
All this is just stuff I have picked up off here and experiances with the older car.
I have wired the plugs on mine to switches and reset the ecu periodically and after and mods..
JGM
1: On early cars they retard the ignition timing when knock detected and take a long time to advance it.
Newer cars are better and advance it pretty much as quickly as they retard it. So if you happen to get a bad batch of fuel and the timing is retarded due to this the early cars will take tank after tank full of good fuel to advance again.
Often feel a slight power increase after a reset as it returns the timing to base values.
2: on the newer cars the MAF sensor is more fragile and the ECU seems to compensate for a failing MAF sensor but eventually it cannot compensate enough and you run the car lean (bad).
If you reset the ecu and all of a sudden it runs rough then likely you had a MAF problem. Replace MAF and all is good again (original power back)
All this is just stuff I have picked up off here and experiances with the older car.
I have wired the plugs on mine to switches and reset the ecu periodically and after and mods..
JGM
Trending Topics
06 September 2003, 10:29 PM
#9
Scooby Regular
Join Date: Jan 2003
Posts: 932
Likes: 0
Received 0 Likes
on
0 Posts
I like that last idea, could be a job for the weekend
Edited to say, are the instructions found here http://www.saxonfields.freeserve.co....iag%20Page.htm the same for the later scoobs too?
I have an STI5 TypeR I want to reset, but I don't wanna ***** anything up.
[Edited by Gedi - 6/9/2003 10:32:04 PM]
Edited to say, are the instructions found here http://www.saxonfields.freeserve.co....iag%20Page.htm the same for the later scoobs too?
I have an STI5 TypeR I want to reset, but I don't wanna ***** anything up.
[Edited by Gedi - 6/9/2003 10:32:04 PM]
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
18 November 2015 07:03 AM