Check Engine and Traction Control Light On

[limey163]

Hey Yaris community,

I just recently installed an aftermarket air filter into my Yaris. It runs wonderful but I have a little issue; the traction control and check engine lights are on. The car runs fine (only issue is I cant depress the gas too far down, if i do it seems as if the car isnt receiving the throttle).

I've checked for holes or cracks in my installation but everything seems sealed, I even electrical taped it to be sure.

Note: I am using the factor air intake hose with the breather attached. I tried connecting an aftermarket breather but after starting the car, it rattles and the entire engine shakes, then it shuts off. Any help is appreciated! :help:

[yaris2010RS]

so u have the entire factory airbox? with the MAF sensor left in place and plugged in?

[limey163]

I took the factory airbox out, only thing I left was the hose because the car needs a direct breathing source apparently.

[yaris2010RS]

lol and lol......

i need to have the MAF sensor. not overly difficult to make a mounting bracket for it on a custom intake but it has to be there. that is the reason for your issue.

as for a direct breathing source? what does that mean?

[limey163]

Oh no, the MAF sensor is still there man, the new filter has a slot for it. All i removed was the clunky plastic box.

[yaris2010RS]

oh. and its plugged into the harness? (just making sure)

[limey163]

Yep. Was the first thing I checked.

[yaris2010RS]

odd..... did u touch anything else? lol do u have a pic of ur setup? its hard for me to visualize whats going on.

have u tried resetting ECU after u put it together? (unplug battery for a few mins and re hook it up

[limey163]

I'll try to get a pic to you (wont be till later tonight). I haven't tried the reset, will do that before leaving work. I didn't come near to disconnecting anything else. Thanks in advance.

[yaris2010RS]

np, i could see if u ran the car without the MAF hooked up the car would go into basically a "safe" mode cycle and throw a code (display check engine and trac) but one would think when its hooked up again it would at least get out of the safe cycle.


unplug the battery and while the battery is unplugged also:
unplug the MAF
then reconnect the MAF
then plug the battery back in.
**this will ensure u leave the battery unplugged for enough time (i believe it needs at least 90 seconds) and it will make sure the MAF was propperly plugged in.

[yaris2010RS]

and Welcome to YW!

[limey163]

Will try that and let you know, thanks for the welcome :).

[limey163]

The site isn't allowing me to track my sent messages YarisRS, so i'm going to post it here and you might also have a duplicate message. Here are some pictures I took earlier on break:

http://img10.imageshack.us/g/photo031610063.jpg/

Let me know what you think.

[marcus]

disconnect battery for 5-10 minutes should fix it.

[limey163]

Tried that yesterday and it did, but after 40 or so minutes of driving, it came back on again.

[yaris2010RS]

^ the MAF is getting a messed up reading. its off but not by a lot or not on a constant basis

[Vinceb]

no chance this new filter was one that you have to oil, and by chance you oiled too much and it covered the MAF sensor is there? otherwise maybe the MAF got bumped when swapping and needs to be replaced?

[Lil Abner]

Can you put the factory air box back in and see what happens? All the electrical tape has me curious. Why is all the tape on there? And yes, the MAF could be dirty from a over-oiled filter. Or maybe that MAF pipe is the wrong diameter. Compare the diameter to the stock tube. They need to be the same! If it's bigger, the MAF will not read correctly.

[limey163]

The electrical tape is just to seal off any air leaking, if any. The filter came pre-oiled, maybe it was overoiled then? The lights turn off and the car runs normally with the factory airbox.

So i'm guessing it has to do with my makeshift filter tubing, theres some leaking going on or maybe not enough air into the breather.

[billfires]

Sorry to bring up an ancient thread but this morning both the check engine and the traction control lights came on in my 2010 5 spd LB. The car is totally stock and has 49000 miles on it. I will have Autozone check the code and report back. Thanks, Bill C

[billfires]

Just had the codes read, it was A P0441 and a P0455. I tried loosening and then tightening the gas cap. Bill C

[billfires]

Disconnected the negative battery cable for an hour yesterday. Used the car multiple times since then, no lights have come on. I can understand the check engine light coming on but the traction control light makes no sense. Bill C