"Secondary air injection fault" '01 GMC Sonoma?

Russ

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This is what the diagnostic said.

I understand that this is the pump that supplies clean air into the exhaust. I am wondering how to troubleshoot the problem further. The fuses associated with the pump look fine.

If someone could give me a link to a diagram of the pump location and maybe a little more info on how to check hoses and also pump function, I would greatly appreciate it.

A little more info: my truck is a 2.2L 4cyl with 105,000 miles.

Thanks,
Russ
 


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