dougmiers

Is there any possible way to reset the main ecu on the es300 with out taking the vehicle to the dealer? Help?

TLW

have you tried disconnecting the Neg terminal on the battery

or pulling th ECU fuse

oh and welcome to club Lexus

-johnny

dougmiers

Do those work?? I know they work on my Toyota truck, but wasn't sure on the Lexus and didn't want to cause any undue problems? Glad to be a member of this organization and thanks for the response.

flipside909

unplug the battery for a few mins...positive side. Or you can unplug the EFI fuse for the same amount of time and will reset the ECU.

mburnickas

why reset? To erase codes?

MoreMGD32

iTrader: (1)

i believe that the 92-96 es300 is and obd2 so just disconnecting the neg terminal for 15-30sec should reset the ECU. the ecu learns how you drive to provide the right fuel/air/shifting mapping for how you "usually" drive. once you reset it, punch and run the gas wide open to about 80mph. then it will run your mapping wide open. Keep in mind you'll have to do this every once in a while b/c it averages that mapping with typical everyday driving(when your not flooring it). it will run alot better then.

flipside909

Only the 94-96 1MZ-FE was OBDII (the first OBDII compliant production engine in the world). 92-93 had the 3VZ-FE. Procedure to reset the ECU is the same way.

Kohinoor

iTrader: (22)

its still a car dude.. lol

YJC88

Does this work on my 04?

lexusk8

This is the universal method for all cars (i.e. disconnecting the battery or the ECU fuse). Unless you have a "check engine" light or some other residual problem with the ECU of your car, you shouldn't need to reset the computer.

vinh

iTrader: (8)

how does the car run better if you punch it to 80 after resetting it?

i'm very tempted to try this

lexusk8

I have never tried to test the high speeds out after resetting the ECU, but from what I understand, the computer would have to re-learn and re-adapt to your driving methods. I'm assuming you would notice some hesitation in the engine or transmission after resetting the computer, but I'm sure that will soon go away once the computer has fully communicated with your driving.

Wodieman

Hi guys , my 97 es 300 is acting crazy .... its burning 89 octane fuel like its water. The check engine light code is reading p0505. What should i do?

BDSL

To reset your ECU, pull the EFI fuse for 10-20 seconds.

But you should check what the CEL is telling you (and fix / replace) whatever is broken.

Wodieman

thanks dude