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Secondary Air Pump - can it be bypassed? 'Fool' the computer? V70-XC70 1998

posted by  someone claiming to be bl on  Tue Jan 24 03:43 CST 2006 [RELATED]


Mike,

I just went thru this secondary air system thing on our 96 850. I don't know where to get a schematic of the system but it consists of 4 components that are very accessable. It has the blower (pump) under the battery tray, the SAS valve which is round and mounted up high on the engine near the firewall (has a purple vac line attached plus a black hose that runs down to the blower), the relay which is mounted near the blower (has three plugins on the 850) and a small selenoid control unit mounted on the inside of the radiator shroud. This has purple and white vac lines running to it plus a plug in connector. That's most of the system. To my knowledge, the SAS valve is what detects airflow (or lack there of) and turns on the CEL. My pump was bad. When I replaced it, the CEL went out on it's own within an hour. I've read other posts where the controller on the rad was bad and several where the SAS valve was bad but I think the blower full of water (design flaw) is most common problem. I don't know how one would "fool" the computer but there's probably a way. Hope this helps.






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