That was the first symptom I had when my Relay Control Module needed a re-solder job. The next problem was the Mystery No Start problem, then the engine dying in traffic. Turns out that the Secondary Air Pump was not really the problem, just the first warning sign.
Of course, the first thing I did was put a piece of black electrical tape over the Check Engine Light. I figured it had to be wrong! Then I found this forum...
Tom