CEL On

[samg1965]

Thank you Jon.... Lot of information there. What would be an indication that the air pump is operating upon a cold start?

[Meir]

Originally Posted by samg1965

Thank you Jon.... Lot of information there. What would be an indication that the air pump is operating upon a cold start?

Well... Every morning when you start the engine, you should hear a faint whine coming from the engine bay. The sound will disappear after few minutes.
This is basically the SAI pump (part number 1 in the diagram) kicking in and out.
The pump function is to push air when the engine is cold and the mixture is rich, to reduce emissions.
If you want to be sure, you can put the top in service mode and remove the engine bay cover. The pump is in plane sight, and you should not have a problem to notice if it is working or not.
Again. Only works on cold start.