Tricking the ECU to Relearn AF map

[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.

NOTE: THIS ONLY WORKS FOR MANUAL TRANS! AUTO TRANS HAS A SET TB OPENING POINT SO THIS METHOD WON'T WORK!

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. It should overflow a bit. Just cap it once it does.

NOTE: STEP 2 IS VERY VERY VERY IMPORTANT!!!! THIS IS THE REASON WHY WOU WILL GET RANDOM OSCILLATION AND CEL DURING DRIVING!!!!

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.

NOTE: IN STEP 5 I ONLY PUT THAT YOU DO THIS CYCLE TWICE. I ACTUALLY DID IT ABOUT 3 -5 TIMES. THIS IS TO PUT THE ECU INTO THINKING YOU DRIVE HARDER TO COMPENSATE FOR THE EXTRA AIR BEING LET IN. IF YOUR WORRIED ABOUT THE ENGINE THEN USE A CYCLE OF 3-1-3-1-3-1 (ex. 3 min rev at 4k, then 1 min of idle). ALSO NOTE YOU HAVE TO HAVE IT AT 75% OPEN THROTTLE which will bring the car up to about 4-5K in RPM.

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

NOTE: TURNING THE CAR OFF HELPS THE ECU TO STORE YOUR DRIVING STYLE AND LET IT SETTLE DOWN. YOU DON'T NORMALLY HAVE TO DO THIS STEP BUT I SUGGEST YOU DO AS A PRECAUTION!

DRIVE IT AROUND FOR A WEEK. During this week you will get some CEL and oscillation but it should go away soon. if it continues after a week try 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 MANUAL!