What is a secondary air injection malfunction?
The secondary air injection pump pumps air into the exhaust to help heat the catalytic converter at cold start. This lowers the emissions at an otherwise high emission time. A malfunction means that computer has registered either a pump failure (common on some models), fuse blown, or improper catalytic converter function. http://www.autoshop101.com/forms/h65.pdf has a diagram of this part, how it works etc.