I too have an 05 sequoia and mine was making the same sound. I took in to a repair shop that I use locally, which specialize in Honda/Acura, and Toyota/Lexus. What they told me is that the noise i was hearing, and what you too are hearing is the air injection pump running. Mine is not giving me any CEL or any codes. Mine is just noisier than normal. I came across a lot of information on the newer models of tundras and sequoias having major issues with the secondary air injection systems. I started doing some research and what I found was there is a way to bypass that system so it does not run. That system is an emission control system and usually only runs at the first cold start up and will run until the ECM tells it to turn off. Normally 30-45 seconds. If you are in a state that does emissions testing than you may not want to bypass the system to make it not run, but the repair cost for that system is very pricey. Thousands, literally. If you are interested in the instructions for doing the modification, just shoot me an email and I will send it to you. I just did it to mine last night and no more noise and no check engine lights.

 

I tinstructionso have an 05 sequoia and mine was making the same sound. I took in to a repair shop that I use locally, which specialize in Honda/Acura, and Toyota/Lexus. What they told me is that the noise i was hearing, and what you too are hearing is the air injection pump running. Mine is not giving me any CEL or any codes. Mine is just noisier than normal. I came across a lot of information on the newer models of tundras and sequoias having major issues with the secondary air injection systems. I started doing some research and what I found was there is a way to bypass that system so it does not run. That system is an emission control system and usually only runs at the first cold start up and will run until the ECM tells it to turn off. Normally 30-45 seconds. If you are in a state that does emissions testing than you may not want to bypass the system to make it not run, but the repair cost for that system is very pricey. Thousands, literally. If you are interested in the instructions for doing the modification, just shoot me an email and I will send it to you. I just did it to mine last night and no more noise and no check engine lights.

Can you please email the instructions. lserrano1118@gmail.com, thank

 

I ran across your post while searching for a way to bypass the air injection system on my 05 sequoia I am highly interested in hearing how you accomplished this could you shoot me your email with the instructions to tommy2620@aol.com. please!!

 

Bypass

05yota & tommy2620,

I just run into the same problem with my '06 tundra. Do you have to take your intake manifold apart to perform the bypass? Can you send along the bypass information? Your help would be greatly appreciated.

- thomps3@clemson.edu

 

05yota
Would you PLEASE email these bypass instructions to hancockaa@aol.com. I am having this same problem with 05 Sequoia.

 

06 tundra

I used a modification of Steve's fix. Pretty much its all the same, finding the ST relay was easy because it was labeled on the fuse box. And then use the blogs or n_c_t_t_o_r_a to figure out the correct color coding for your THA wire. Its different between the 1st and 2nd generation Tundras, so I imagine it will be different between Seq.

Steve's fix:
http://www.tundrasolutions.com/foru...chments/tundra/61510d1304395076-aip-simulation-circuit-diy-aip-override-1.1.pdf

Toyota guides:
http://www.*******.com/fsm/

Note: I have just applied this about two weeks ago. It seems to be working, since I don't hear the whining of the pump anymore at start up. I'll comment in a year or so hopefully to give more info on how long it holds up.

 

Air injection problems...2005 Sequoia

Gang, I tried the fix with "Steve's fix" below but had no success with it over riding the system. I'm guessing I have a wire wrong either on the relay or the wiring harness to the mass air flow sensor. At the same time my Toyota dealer swore it had to be the Air Injection Driver so against better judgement I bought one online for $220 and of course no fix. Now they say of course it needed that part anyway but its probably a stuck air valve which is under the intake manifold on my model.

Anyone have any more detailed photos of the Steve's fix or don't mind me quizzing you on the wiring diagram? The vehicle is a 2005 Sequoia.

Brad

PS...on the Steve's fix, I can send a image of the questions I have. Basically I'm wondering on page 3, (automatic bypass) what the dotted line means on the automotive relay and also on the relay it shows a line between post 30 and 87a. Does that mean a wire connects to the 2 post?

I used a modification of Steve's fix. Pretty much its all the same, finding the ST relay was easy because it was labeled on the fuse box. And then use the blogs or n_c_t_t_o_r_a to figure out the correct color coding for your THA wire. Its different between the 1st and 2nd generation Tundras, so I imagine it will be different between Seq.

Steve's fix:
http://www.tundrasolutions.com/foru...chments/tundra/61510d1304395076-aip-simulation-circuit-diy-aip-override-1.1.pdf

Toyota guides:
http://www.*******.com/fsm/

Note: I have just applied this about two weeks ago. It seems to be working, since I don't hear the whining of the pump anymore at start up. I'll comment in a year or so hopefully to give more info on how long it holds up.

 

I have a 2005 Sequoia, Bought used a few months ago and I have always had that same sound at startup. I thought that sound was normal ...if I just live with it, will it damage or cause overheating or something.?

 

Cause of air noise.

One option to repair.

By pass option.