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I have a 1995 Jag XJ6 and kept getting a "Secondary Air Pump Fault" Upon tracing the harness and researching it I finaly found the problem in a faulty connection.
In my reaserch I found the purpose of the pump........ When the car starts and is in the "Rich run" or choke mode the secondary air pump flows air to the exaust manifold (on the Jag) for anywhere from 15 seconds to a max of 4 minutes. This causes the exaust to heat the catilitic converter faster and helps reduce emmisions. One or two minutes to me is no big deal and did not make the car run any better or worse. The problem I had is while the "Check Engine" light stayed on I would not know if anything else went wrong unless the car started to run funny. After dissasembling the pump (it's electric and not belt driven and suppose to be a non-servicable item and high buck) cleaning and lubricating it, checking all hoses and check valves, replacing a relay, I finaly stumbled across a dirty connector. The light is now clear and working good.
HOW MOST WORK>>>>>>The engine computer senses engine temp rise and runs the pump when started until you get a 15 degree rise in engine temp, if the temp sensor goes out then it defaults to the intake air temp. To me a lot of technology and potential problems for an average of one minute lower pollution but we gotta have it according to EPA. I am not acquainted with the Volvo set up but that is the basic set up for most cars, like the other string said, check vaccuum hoses, blocked air hoses to the exaust especialy for carbon deposits at the manifold end, check the check valve (keeps exaust from coming back through the air hose) and also is the pump engaged when the car is cold. It may only be for a couple of minutes so it is hard to check if the car is warmed up.
Hope this helps you understand the system and helps trouble shoot it.
Good luck on finding your problem.
Dennis
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