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I did a search, and I couldn't find an exact answer.

How exactly would I go about reseting my ECU. I know I have to disconnect the batter for like 45 min. er something, but which cable do I disconnect? How do I disconnect it? Thank you guys! I'm going to try and do this tonite, so if you could help, the sooner the better. :cool:
 

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From the MRT Australia website:

How to reset your ECU (without disconnecting your car battery!)

Following extract from Brett Middleton of MRT Performance (Thanks Brett!)

By the way its in the WRX book...

ECU clear memory procedure is as follows:

1) With engine at operating temperature, turn engine off and place gear shift lever into park (auto transmission cars)

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. With the ignition OFF connect black to black and green to green.

3) their exact location varies depending on the year model


4) Turn on ignition and cycle the gearshift lever from park to neutral and back to park (auto transmission), 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. (Ed. don't have to do the gear shift cycle in a manual car, only the auto)

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) the ecu is now clear and re set!

7) choose your favourite radio station without having to reset it ! (grin) for more data and regular info like this subscribe our regular update service........ http://www.MRTrally.com.au The TRUE rally based enhancement workshop

regards, Brett

(Disclaimer: If you don't think you are capable of following this, or have any doubts, DON"T DO IT! Go see your local performance shop ie MRT and ask for there help.)
 

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Sorry, I know this thread is long dead, but it came up in one of my searches so I'll post an update for other users.

My 2004 only seems to have one black connector (the two green ones are there) and two loose, unconnected wires. Therefore this procedure doesn't really apply for me.

I have found another one which seems to work without unplugging the battery. Simply cycle the car on and off 5 or 6 times and the CEL goes away. I have no idea if it's been legitimately "cleared," but it's not lit anymore. Radio stations are a-ok after procedure.
 
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