DIY: Tricking ECU Throttle Body Relearning

[gwasabi]

I've been reading a bunch of people who installed the throttle body and are having CEL coming on. I used to drive a G35 and a Celica and having done intake mods to it and having CEL come on, I asked one of my modder friends to help me get rid of this. This trick worked on both my celica and G35. This should get rid of the Oscillation and CEL light after installing the 1zz TB.

Step 1: Install TB....I don't have a DIY for this, just find someone else's and do so.

Step 2: Get all the air out of the Radiator hose. This is done by popping off the radiator cover and running the engine until the radiator doesn't bubble anymore. Then put the cover back on.

Step 3: Disconnect battery over night (I disconnected for about 2 hours). This is to make sure the ECU resets itself. Then reconnect the battery.

Step 4: Turn car on and you will notice it oscillate for a while. Usually for about 2 min or so. let it settle.

Step 5: IN NEUTRAL, Rev the car up to about 4-5k RPM for about 5 min. Then let the car idle for about 2 min. Then Rev the car up to about 4-5k RPM for another 5 min. The ECU learns how you drive and tries to adjust the AF ratio according to your driving performance. Doing this step tricks the ECU into thinking that you are driving "super crazy racer maniac style".....honestly its just saying you drive with a heavy foot so it puts more fuel at a faster rate to compensate for the amount of air coming in.

Step 6: Turn car off. Start it up. And Test drive. If you still get the CEL an oscillation, park, then do Step 5 again.

I did this trick on my celica, g35, and Yaris and seem to have worked all three times. My yaris is running off the 1zz throttle body without the chip mod and I haven't had oscillation or CEL thrown for over 3 months. when I did this trick, the CEL and oscillation went away immediately.

I'm not garanteeing this as a surefire way to get rid of it but it seems to work on most cars. Try it out if you have the time and let me know!

Hope it works for you guys too!

BTW I drive a 07 Yaris HB.

[yarstar]

HOw about the high cold idle? Does it solve that issue too? Thanks for posting this BTW.

[gwasabi]

cold idle isn't solved this is due to the loop mentioned above and the actual TB opening being alot wider than the stock TB. at cold start it will usually rev up to about 1.5K then back down to 700-800 RPM