Celica Forums General Discussion Exterior 2004 Celica AEM CAI CEL... Fixed?

I was playing around with the hoses, since my CEL had been coming on after putting the Intake in.

Anyways, I think the instructions for 2000-2003 may tell you to cap the wrong thing (when installing on a 2004 model)! Ok, let's see if I can convey this:

Ok, click the picture to get it to full-sized if you can't see what I'm saying there.

I set it up like this, re-set the ECU, and have driven nearly 1,000 miles (been about 3-4 days since I did this), and so far the CEL has not come back (it was coming back in about 24 hours before).
I haven't noticed any ill-effects, and it performs just as well as it always did!

I'll be taking my car in for some horn-work on Friday, I'll ask the guy to check this out as well and see if it will cause any damage (I doubt it will, since mine has been working perfectly, but I should double-check for safety ).


Hope this helps someone!

horn work you going to be putting in a new horn.. an air horn perhaps

hmm i capped the part you uncapped although i do have an '01 gt also i cleaned the mafs sensor and that fixed things on mine...

I think the wiring or relays or something are messed up, concerning the horn But, I wouldn't mind a big ass fog horn on something

But yeah, the instructions say to cap it, but they also say that they are for 2000-2003 Celicas, so...

I've also cleaned the sensors, but the CEL kept coming on, complaining about a vacuum valve being stuck closed.


Out of curiousity, do the 01's (or any 2003- for that matter) have the T connector thing? (pointed to in green on the picture above.)

This looks like the correct solution for 2004 GTSs... after trying this workaround, the CEL has NOT come on (and it's been a few days), whereas it would come on after about 24hrs previously (and I had tried everything recommended up to that point).

Good job guys, and thanks for sharing the solution.

you are totally right thats the way i have my 04 setup and no cel yet, actually no i take that back i had one for like an hour from my drive to vegas to cali, temperature was my only idea of what caused it, we went from 119 degrees to 80 degrees but nothing since then