The air pumps on the 202's are electrical. They are not driven by the belt. If you suspect the pump you'll have to disconnect the wires at the pump. The pump is a black looking box under the alternator. Try to follow the wire to the plug. If you can't reach it you'll have to raise the car and remove the bottom engine cover.
I've never had a problem with the electrical pumps. However, the mechanical ones are know to have problems (noisy clutch, bearing).