2002 Pontiac Montana Service engine lamp on

First thing is look for any heat damage to the hoses or diverter valves that lead into the exhuast, this system injects air into the exhaust to aid in converter operation. If no problems found, you need a scanner that can read freeze frame data, and has two way communication to the module, You must be able to issue commands to operate the pump, and monitor 02 sensor values. GM dealers?