I seemed to have an issue with the P0410 code, It keeps coming back every time i reset it and I just recently changed the secondary air motor and the unit itself is working fine and I can't seem to know what it is. I have a C5 Corvette 2004

 

It could be a few items setting the DTC..since the pump was changed and if you can hear it run on a cold startup of the engine we can take that off the table…there is a shutoff or diverter valve on the pump and I don’t know if that assembly comes with the new pump but you will see a small vacuum hose going to it (picture)…you can apply vacuum to it and maybe you can hear it open and close…the SOV allows the air to flow from the pump to the supply hoses to each manifold…next the vacuum line you removed goes to the AIR solenoid (pictured) if you have a vacuum hand pump like a Mityvac you can apply vacuum to the line and see if the vacuum holds…the solenoid is way above the PCM in the right wheel well and the vacuum line may have a leak…next is the solenoid itself..2 wires one which is power and the other ground for the solenoid which is supplied by the PCM…easy to check with a Tech 2 or any bidirectional scan tool to see if the PCM is indeed grounding that circuit…best you can do to check the solenoid is remove the solenoid and apply 12 volts and ground and see if it opens…again applying vacuum to one of the 2 vacuum lines and seeing if the vacuum drops while energizing the solenoid makes sure it is opening…you will have to keep your fingers crossed that the ground wire from the engine computer is suppling a ground and the wire is not faulty !!…also it can be the vacuum line from the vacuum reservoir (pictured) to the solenoid which may be damaged.

 

In the second picture and is it suppose to create a vacuum during cold start ? also i've check with the Solenoid valve and it looked really dirty and probably the reason why i'm getting the code thrown in. The wires connecting to the Solenoid vale is fine and one of the solenoid wire creates a vacuum

 

I don’t think the solenoid is energized during cold start…I looked at my O2 sensors and they did not decrease as they would when the pump is operating and the solenoid is energized…the only decreased slowly because the O2 heaters are operating…saying the wires to the solenoid “looks fine” doesn’t mean it has at least power going to it and like I said checking the ground side of the circuit requires a bi directional scan tool…don’t know what else I can tell you..all the info I can offer you is in my first post.

 

So i checked my solenoid valve and its clicking open and closed and getting 12v constantly and grounded so I see no problems there.

Does the shut off valve affect the code by any chance and should it have some vacuum while the engine is on ?

 

Without a bi directional scan tool which allows YOU to ground the circuit you can’t say “it’s grounded” !!..you grounded it but not the engine computer…you can have a broken wire from the PCM to the solenoid or the engine computer can also be bad worst case scenario…with the engine running there should be no vacuum at the shut off valve until the solenoid opens allowing the vacuum to get to the SOV…now you run the car and jumper the relay which will allow the pump to run and also operate the solenoid by applying power and ground to it and then see if the shut off valve is opening by checking for airflow out of the pump which goes to the exhaust manifolds…this is a lot to do but without that scan tool this is the only way to check it…my friend Matt did a YouTube video on the operation of the system so hope it helps..it is a 2 part video.