Help! CAI throwing codes - Toyota Yaris Forums

ThomEdwardDudgeon · 09-28-2012, 11:31 AM

I just installed a Spectre CAI unit (with an MAF sensor connector on my 2011/12 Sedan. Installation was easy, except for the MAF unit, which was kinda guess as you go. I positioned the sensor in the same position as it was on the OEM, and all connections are tight-but it runs like poop! I took the whole thing back off, put all the OEMs in place and now everything is fine. Can anybody help?

goliath1812 · 09-28-2012, 11:35 AM

Did you disconnect the battery to let the ECU re-learn after you installed the CAI?

CTScott · 09-28-2012, 11:37 AM

I haven't seen the Spectre one for the Yaris, but the typical issue with generic aftermarket ones is the pipe being the incorrect diameter. The MAF sensor is calibrated to the diameter of the pipe it is mounted to. If you change that dimension then its data and hence the ECM's interpretation of airflow into the engine is skewed.

tooter · 09-28-2012, 11:52 AM

It looks pretty standard...

They go for around $70. If the filter is oiled maybe the MAF got fouled.
Hey, does the MAF have a direction? Can it be installed backwards? I'd yank the battery cable to reset the ECU, see what happens and go from there.

09-28-2012, 11:31 AM	#1
ThomEdwardDudgeon Chainsaw Drives: 2012 Yaris Sedan Join Date: Sep 2012 Location: Bay Minette, AL Posts: 5	Help! CAI throwing codes I just installed a Spectre CAI unit (with an MAF sensor connector on my 2011/12 Sedan. Installation was easy, except for the MAF unit, which was kinda guess as you go. I positioned the sensor in the same position as it was on the OEM, and all connections are tight-but it runs like poop! I took the whole thing back off, put all the OEMs in place and now everything is fine. Can anybody help?

09-28-2012, 11:35 AM	#2
goliath1812 View User's Garage Drives: 2010 Prius, 2007 Yaris Sedan Join Date: Oct 2009 Location: Ocala Florida Posts: 368	Did you disconnect the battery to let the ECU re-learn after you installed the CAI? __________________

09-28-2012, 11:37 AM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	I haven't seen the Spectre one for the Yaris, but the typical issue with generic aftermarket ones is the pipe being the incorrect diameter. The MAF sensor is calibrated to the diameter of the pipe it is mounted to. If you change that dimension then its data and hence the ECM's interpretation of airflow into the engine is skewed. __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New aFe CAI = CEL with P0101 Error	randydid	Third Gen Yaris General Discussion	10	01-16-2012 10:24 PM
Throwing a CEL after adding an intake and headers	Mister Z	Performance Modifications	19	07-28-2011 07:33 AM
P2420 and P0441 codes	jkonrath	DIY / Maintenance / Service	3	09-05-2010 09:33 PM
FS: BOMZ CAI	posaunemeister	Items for Sale by private party	8	10-03-2009 02:02 PM
TRD CAI & TRD Qiuck Shift	Polar	Items for Sale by private party	7	08-02-2007 06:03 PM

09-28-2012, 11:52 AM	#4
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,961	It looks pretty standard... They go for around $70. If the filter is oiled maybe the MAF got fouled. Hey, does the MAF have a direction? Can it be installed backwards? I'd yank the battery cable to reset the ECU, see what happens and go from there.