Battery disconnected for how long - to reset the ecu?
Scooby Regular
Joined: Nov 1999
Posts: 10,504
Likes: 1
From: Scotland, UK
Phil,
I would use the ECU wires under the dash to reset it. I did this for the first time a few months back with Alan Garrod. Worked a treat.
I lifted this directly from MRT's site:-
How to re-set your ECU unit.
ECU clear memory procedure is as follows for auto and manual transmissions:
1. With engine at operating temperature, turn engine off. Place gear shift lever into park (auto transmission cars only)
2. Locate the two ECU check connectors, for most cars they are located under the steering column and consist of a black plastic male and female connector, and a green male female connector. The exact location of the connectors varies with the different year models, but generally they are located under the steering column on the drivers side.
NOTE: sometimes they are still taped over with some small amount of plastic tape, so look hard, they will be there!
With the ignition OFF connect black to black and green to green.
3. Turn on ignition, do not start the engine, (and for auto transmission, cycle the gearshift lever from park to neutral and back to park ), depress the accelerator pedal to full throttle and hold for a few seconds, and then release.
Start engine and then drive for at least one minute, keeping road speed above 11 Km/h.
4. ECU is now re-set.
5. At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs.
6. Once, stop the car and turn off the engine.
7. Disconnect the plugs.
8. Job complete
Stefan
I would use the ECU wires under the dash to reset it. I did this for the first time a few months back with Alan Garrod. Worked a treat.
I lifted this directly from MRT's site:-
How to re-set your ECU unit.
ECU clear memory procedure is as follows for auto and manual transmissions:
1. With engine at operating temperature, turn engine off. Place gear shift lever into park (auto transmission cars only)
2. Locate the two ECU check connectors, for most cars they are located under the steering column and consist of a black plastic male and female connector, and a green male female connector. The exact location of the connectors varies with the different year models, but generally they are located under the steering column on the drivers side.
NOTE: sometimes they are still taped over with some small amount of plastic tape, so look hard, they will be there!
With the ignition OFF connect black to black and green to green.
3. Turn on ignition, do not start the engine, (and for auto transmission, cycle the gearshift lever from park to neutral and back to park ), depress the accelerator pedal to full throttle and hold for a few seconds, and then release.
Start engine and then drive for at least one minute, keeping road speed above 11 Km/h.
4. ECU is now re-set.
5. At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs.
6. Once, stop the car and turn off the engine.
7. Disconnect the plugs.
8. Job complete
Stefan
Scooby Regular
Joined: Mar 2001
Posts: 1,998
Likes: 0
From: uk
I have never found the under dash wire way to work.when the dealer used to do a reset for me at services,I would loose a few pounds of boost for the first 15min of driving before it settled back to normal.with the under dash wire way the boost never dropped.
I noticed that when I changed to a my99 ecu that I got the same boost behaviour as a dealer ecu reset.also when I stuck the my00 ecu back in,just to see how cr4p it really is,the same thing happened.both these ecu's had been out the car for a while so do not know if they reset as soon as unplugged,or if it needs longer.I would just disconnect battery overnight.
I noticed that when I changed to a my99 ecu that I got the same boost behaviour as a dealer ecu reset.also when I stuck the my00 ecu back in,just to see how cr4p it really is,the same thing happened.both these ecu's had been out the car for a while so do not know if they reset as soon as unplugged,or if it needs longer.I would just disconnect battery overnight.
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
Nov 18, 2015 07:03 AM
