Secondary air injection switching valve.......?

Hewitt isn’t without its own hiccups. Pretty sure a couple members installed only to be hit with a different code followed by poor customer support. Not sure if that’s improved.

Slyfox, a t4r member, was at one point putting a Tacoma kit together, but don’t think it was working for v6

 

I saw the same complaints about new codes being thrown after install of the kit.

 

I’m hoping for a reliable and real delete version to come out. There is a lot of demand for a delete on the secondary air systems. Hoping Hewitt gets it right.

 

Someone correct me if I wrong, since they added the blower to newer vehicles, like a 2015 this problem should be corrected. The reason this was happening is that moisture was creating corrosion and preventing the valves from working. Since the newer vehicles have a blower to help evaporate the moisture, it should be a non issue for a 2015 right? I know the foam filter can cause problems but I will do the uni filter mod.

 

If moisture is the problem does anyone see a potential problem with an entirely exposed filter on the pump?

 

They all (2012+) have a blower. The 2012 didn’t run it at shut down which left moist combustion gases around to corrode things. 2013 changed the ECU to run the blower at shut down to hopefully purge with fresh air to reduce condensation and corrosion. That appears to help things a lot. But not a complete fix based on reports of failures here.

 

Moisture problem is from the exhaust gases, not the atmosphere.

 

I doubt its a non issue, the blower is not there to get rid of the moister. The purpose of the blower is there to add oxygen so the catalysts warm up quicker so it starts worker earlier during cold starts.

I wish the delete will come soon, I off road my vehicle alot and go through deep water crossings and I will get water in the system eventually. I want to get rid of the entire system. Not sure why its taking so long?? I looked under the hood and its 3 connectors in the entire system. 1 for the blower and 2 for the valves. Any intelligent Electrical Engineering Master student can probably defeat the system and do a school project on this.

 

get the by pass kit gives you the plate and harness 158 bucks high tech industrie no need for pump

 

they have a kit to by pass the pump 158 bucks

 

The problem is that the ECU does a number of failure checks on the system (e.g. if I enable the pump does it draw an appropriate amount of current). So it does require some complexity to "fool" the ECU into thinking everything is OK. Unfortunately not every Toyota ECU with the same 2nd air system does the same checks either it would appear. So for example the slyfox system worked reliably on Tundra and initially worked on a Tacoma. Unfortunately it only *appeared* to work for awhile before eventually throwing a code. And of course we *know* the 2012 ECUs are different from the 2013+ ECUs so even if there is a fix for a 2012 we won't know if it works for 2013+ until someone tries it.

So you need an EE with access to every possible model year ECU around as well as long enough access to them to verify it won't throw a code over the long term. Since that is essentially impossible that means said EE needs to find *competent* vehicle owners for every possible year and accept the fact the bypass might need a redesign/firmware update after production has started once it is discovered some particular version of the ECU doesn't like the bypass. And of course every time it appears there is a problem it could be an inept owner rather than an actual ECU version.

Lastly most EE's make a fair bit of money and have employers willing to pay them for every hour they are breathing on this earth so when it comes down to working for "the man" at good pay vs. dealing with a small volume niche product that is essentially a reverse engineering effort it isn't a particularly compelling *economic* case. So then it is really down to finding someone who is interested and passionate enough in solving the problem rather than at all interested in money. Fortunately engineers do often fit into that category...

 

I agree we do need a young passionate EE that owns a Tacoma to help us out here.

I still have not lost faith with Hewitt and hoping a solution comes out in the future.

 

My '14, with very low miles, nearly left me stranded with clogged SAI valves and there are reports of other '13-'15 doing the same. And no the current warranty for '12 does not apply. I assembled a small kit to carry around just in case. It consists of the aftermarket Tundra valves I found cheap, the OEM gaskets and a couple of tools. It was not a whole lot of fun having it go limp out in the middle of nowhere....

 

When in limp mode what happens? Speed restriction?

 

Speed and/or RPM restriction. I couldn't go over 20 mph or 2000rpm.

 

I was trying to be proactive by checking the foam filter on my 2015 and it still looks like new. Thought about the uni filter mod and decided just to check the foam filter every couple of yrs. it’s simple to check. I guess if the valve goes it goes. At least I will know quickly with the reported codes and limp mode.

It may even be prudent to massage a little fluid film into that foam filter to keep it from drying out and deteriorating. Since fluid film is a non petroleum product, it won’t hurt the foam and would aid it catching debris.

 

i deleted mine 45000 miles ago with the kit never had any issues and theres many other ways to fool the ecu with a plain old timmer you can purchace for 5 bucks just plate the ports off splice timmer to your wiring from air pump problem solved

 

Thanks for the info but that was posted 3 years ago. Trucks been gone.

 

Not to mention tampering with an emissions system, if caught, could lead to a hefty fine:

https://www.epa.gov/sites/production/files/documents/vehicleengine-penalty-policy_0.pdf

Not too many young, idealistic EE with their entire careers ahead of them are willing to risk it all for defeating a shoddy, but federally protected emissions system. Look what happened to all the VW employees involved in Dieselgate. Or the Screaming Eagle division of Harley.

What's surprising to me, though, is that in 48 pages, only one other poster asked the question: With all the money owners are willing to spend bandaiding this crap system (including myself on my new-to-me 2014), why not just purchase a new 2011 ECU from Toyota and completely delete the hardware to the system all together? Quick glance shows a brand spanking new ECU from Toyotapartsdeal.com is about $500-$800, depending on which model you have. Plug, play and trash can the boat anchor. What am I missing here?

 

oh cry me a river. Isn't this the same EPA that caused the trashing of the Animas all the way from the Gold King Mine near Silverton to the reservations down your way? I can tell you that being in limp mode nearly stranded in nowheresville that compliance with some mindless regulation that does nothing for the environment was the last thing on my mind. I suspect that those who have been caught in dangerous traffic merge situations with the sudden limp mode would echo this as well. Enough of the preachy stuff already. I will take my chances .