Here is something interesting I stumbled across after a google search of the p 0410 code. The link is below, and the interesting quote is #55 on page 3
Maybe it will put you in the right direction!
09-12-2006, 09:16 AM #55
Crew Cab Sonoma
Big, huckin A$$hole
Join Date: Mar 2004
Post Per Day:
Location: Chattanooga, TN
User is: OffLine Re: SES: Secondary air injection system
UPDATE: im getting my CC ready to sell, and returning it to stock. and have re-installed the air injection system. i found i had a blown fuse, so i replaced it, and bech tested the air pump motor and it worked fine. a couple of days passed, and the SES light returned... yep, code p0410... air injection system.
the 30A fuse was blown again....
so off came the pump asy. for a comeplete teardown inspection.
first, the pump.
the pump had only been on the truck just over a week, and it had 2-3 onces of water in it again... but the truck hasnt seen any rain since being re-installed, so the water can only be condensation from the exhaust system... which there was a strong exhaust smell to the water.
there is a foam filter inside the front cover, and it was petrified, and crumbling, and started getting sucked into impeller. the impeller blades themselves were intact, and undamaged. again, bench testing the motor showed it to be running fine, and delivering plenty of air through the outlet port.
everything was cleaned, and reassembled, minus the foam filter....
i also drilled a small hole into the bottom of the air inlet housing, to allow any water buildup to drain out.
next, i did a check of the vacuum operated air shutoff valve at the end of the pump`s air discharge port. using a hand vac. pump to check it revealed the valve to be holding vac., and opening and closing properly. blowing through it in both open and closed, showed it to be sealing well when closed, and flowed well when open. no problems here.
last, i checked the vacuum switching solenoid, and found it to be DEFECTIVE....
when applying power to the terminals, there was no telltale "click" from it, but current was passing through the coil windings, so the pintle valve must be stuck inside.
spraying penetrating oil into the vac. ports, and lightly tapping on the solenoid didnt free it up, so i disassembled the solenoid, and found the pintle valve to be severely corroded. scraping it with a blade, and some fine sandpaper got it back into decent shape.
i washed down all the parts, including the inside of the solenoid housing with penetrating oil, and after some tedious, and frustrating reassembly, the solenoid was working properly, with a distintive "click" when power was applied...
with the everything back on the truck, and a new fuse, the system is actually quieter than before, due to the lack a "gurgling" noise coming from the air inlet tube... apparently, the faulty solenoid was causing the air shutoff valve to remain open all the time, which it shouldnt be....
so far, all is well. i will will post an update in a few days, to let you know if the code returns....
i think most of these pump assemblies can be repaired, for little or no money.
i also think most of the water that gets into them comes from the exhaust system, not the air inlet tube....