04 Trailblazer SES code P0410 secondary air intake malfunction help

[skidooboy3]

I just bought an 04 Trailblazer with a 4.2 L with 90,000 miles on it so it's out of warranty. It runs fine and I drove it almost 1000 miles home with no problems but the SES light came on steady while driving home in the rain. I had the code checked and it came up with code P0410 for secondary intake malfunction. I typically buy the service manuals from GM but just got the vehicle a week ago and haven't purchased one yet so I'm not familiar with where anything is located yet on this vehicle.

I've checked around on the internet and read stuff about water coming in an intake for the pump (smog?) and causing problems with Air pump and valve. I did talk to the service manager at the GM dealership who gave me a bulletin about checking the valve and pump and possibly replacing the motor if it was inoperable but I didn't speak to any mechanics about where this was located.
So now I'm wondering where is this pump located? I didn't know if it's on the engine or on the driver's side or passenger side. I see an air inlet for the air box on the passenger side and one on the driver's side going toward the battery box. I didn't want to start pulling stuff off unnecessarily looking for it. I was also wondering if anyone knew about the service bulletin 06-06-04-017 Mar 06 about Secondary Air Injection-revised pipe placement because my dealer couldn't find it at the time I was in there because I think I had the wrong number at the time. Anyone have any thoughts on this issue? And lastly, will the SES light go out on it's own once I do locate and fix the problem or will I have to have it reset? Thanks in advance for any help.

[rodeo02]

The air injection reaction system (AIR) is on all 2004+ 4.2's. There is an electric blower under the truck, tucked inside the frame rail about under the drivers seat. The blower draws it's clean air from a hose tied into the air inlet tube between the airfilter box and throttle body, pressurizes it slightly and blows this clean air into a port in the cylinder head directly above the exhaust manifold, dead center. There is a can shaped check valve bolted to this port with the air hose clamped to it and an electrical connection. The most common failure point of this system is this check valve. Remove the hose, the electrical connection and 2 bolts and it's off. Very easy. Problem is, it's about a $125 dealer only item. The check valve gets corroded/cruded up and doesnt seat. Let it go long enough and moisture from the exhaust can back flow into the system and destroy the $$$ electric air blower. I'd start by removing and checking the valve and check the hoses for water.

G/luck
Joel

[skidooboy3]

Thanks for the help Joel!!! I finally had a chance to work on it yesterday and the valve on the engine was stuck and we weren't able to free it. The hoses were clear and the pump still worked fine. I bought a new valve and the light went out after the first few trips. Now I'm curious how you prevent it from happening again. I took off the small tube in the front of the air box so it has to suck air from the side rather than being forced in from the grill so hopefully rain won't find it's way in.

[rodeo02]

I dont know of any way to prolong the life of the check valve, other than maybe pull it and spray it out with carb cleaner periodically. If the hose you refer to is the suction line to the AIR blower (installed between airfilter box and throttle body), I'd definately leave that hose plugged into a clean air source. Drawing unfiltered air into the AIR system will just decrease blower & check valve life.

Joel

[skidooboy3]

OK, thanks for the input. I didn't remove the air hose for the injection pump, I removed the air inlet tube at the front of the airbox that points right into the grill so hopefully water won't be forced into the airbox. By removing that tube at the front it'll now have to suck air from the side of the airbox underneath the hood. I was hoping that would solve the water problems.

[larry04tb]

Joel, any idea how long that pump should run when the vehicle is cold? I am also getting the P0410 code. Though I hear and feel the pump running but only for about ten seconds. Maybe that is too short. What controls how long it runs??

larry

[skidooboy3]

Hey Larry, I don't know the exact answer to your question but was going to tell you that mine runs about the same amount of time when you first start. What we did was take that valve off the engine above the exhaust manifold and then found that air hose that comes up from the blower motor and then started the engine and could feel air blowing out of that hose so we knew that was working properly. Then we checked the valve which was stuck. We put power to the leads on that valve and it wouldn't open so we bought a new one and verfied that it worked before putting it back on. Within about five starts, our code went away and hasn't been a problem since. Good luck with yours. Bill.

[larry04tb]

Thanks for the reply. So the can type device on the side on the manifold is a solenoid! I thought the electrical connection on it was the sensor. That makes it easy to check. A project for this weekend.

Thanks
Larry

[larry04tb]

Originally Posted by larry04tb

Thanks for the reply. So the can type device on the side on the manifold is a solenoid! I thought the electrical connection on it was the sensor. That makes it easy to check. A project for this weekend.

Thanks
Larry

I replaced the solenoid on the manifold (After 1 over a week back order from Chevy) and the SES light has been out after reseting it. Thanks for the help.

[rodeo02]

Good deal Larry. Thanks for the follow-up. What was the price on the solenoid valve if you don't mind me asking? I have a feeling Chebby parts counters sell a lot of them.

Joel

[Charbear]

Maybe a silly question...but how do you check the valve?

Originally Posted by skidooboy3

Thanks for the help Joel!!! I finally had a chance to work on it yesterday and the valve on the engine was stuck and we weren't able to free it. The hoses were clear and the pump still worked fine. I bought a new valve and the light went out after the first few trips. Now I'm curious how you prevent it from happening again. I took off the small tube in the front of the air box so it has to suck air from the side rather than being forced in from the grill so hopefully rain won't find it's way in.

[kiuppy]

how does this hurt my truck, if i don't fix it?
can i "pull a fuse" to shut light off?
how do i check blower motor, hook to 12v?

[maxwedge]

Welcome to AF, please look at the dates before jumping into a thread, start a new one, thanks.