rob-2

My air pump has now come on a few times after the car has been running for some time. This evening while getting off the freeway it ran. Everytime it runs after the motor is warmed up, the car throws a P0411 code.

Do I have a bad air pump?
Thoughts?

I'm debating doing a pump delete so I don't have to deal with it in the future.

04 w/ 104K
Regular service
Everything else works well
No modifications

MaxInValrico

P0411 - Secondary Air Injection System Incorrect Flow.

Check for a vacuum leak.
Test the air control valve.
Worst case. Replace the ECM.

rob-2

I don't believe I have any leaks. I certainly cannot find any. Why would the pump come on if the motor was already hot?

MaxInValrico

OEM vacuum hoses? A small crack in the end of one will do it. I have an '04 and I'm replacing all my vacuum lines this weekend. I'm not certain what pump you are referring to as coming on? According to the Honda Service Manual the P0411 is a vacuum issue, with a worst case being the ECM.

Togobox

Contactor Assembly/Air Pump Relay:
P/N 39794-PCX-023, H/C 8452989

Try a new air pump relay, see how it goes.

rob-2

You might be on to something. I got the code again after resetting the ECU. This time when I cleared the code the pump just kept running.

Aside from a relay failure what drives the pump to remain on?

Togobox

I would at least unplug the air pump until i found out the actual cause before the air pump burn up.

BBV S2K

https://www.s2ki.com/s2000/topic/902...mp-delete-kit/

apparently this one does fix the CEL and completes the AIR PUMP DELETE... im trying it

rob-2

I would at least unplug the air pump until i found out the actual cause before the air pump burn up.
[/quote]
How best to disconnect?

05thumper

Also check the wires running to it.