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Hey folks.I just got a KL31 ecu and JE50 vaf for my 92 mazda KL 2.5.Just need to know what i need to do when swapping ecu's.Do i disconnect the battery or just make sure the keys are not in key barrel etc.One more thing how long does the KL ECU have take to set itself up.

disconnect neg on battery, disconnect ecu, plug in new ecu and VAF, reconnect battery.

Start and run... the ecu will start pulling data from sensors that it needs and will begin storing the information. If there is an issue with a missing sensor or faulty sensor (or a direct short in wiring) that the ecu needs, it will tell you.

Just did the kl31 ecu swap,Did everything you said.everything went smooth,Thanx for the tips mazdags94

With the KL31 installed and the neg pulled on the battery depressing the brake pedal for 15secs would of cleared the memory in the KL31 ecu for you and it could of started fresh. It's advised you keep the motor running for 15 mins minimum after clearing the ecu but I'm not sure why. Cheers

Daninski wrote:With the KL31 installed and the neg pulled on the battery depressing the brake pedal for 15secs would of cleared the memory in the KL31 ecu for you and it could of started fresh. It's advised you keep the motor running for 15 mins minimum after clearing the ecu but I'm not sure why. Cheers

It gives the car a chance to learn itself and store data from the sensors. This way, you have some data in the ecu prior to driving so it knows how to operate with your setup. If something's off, you'll know (you'll either hear or feel it). Good to hear it was successful.

Thanx for the tips boys.The only prob a have found since the swaped ecu's is that the rev's jump from 600 to 1100 rpm when i turn the heater on and the revs seem to jump up a 1000rpm when the lights are on.

Check for vacuum leaks and also try adjusting your TPS (check the FAQ's for this).

Thanx mazdags your a champ,ill look it to it right away..cheers

You could have air in your coolant system as well that can cause idle issues.

yeah you could be right,i just changed the radiator and coolent.it wasnt haven idle probs before that.How can i fix the prob?Can driving round with air in the coolent crack a head gasket or somethen..thanx for any help