Below is a handy SAS diagram for Volvos with the “white” block 5-cyl engines, namely some 1996 and all 1997 850 models, S70, XC70 and V70 up to year 2000, and C70 up to year 2004.
- SAS Delete/Removal Tutorial (No CEL!)
IVIUSTANG » Yes, this does get rid of the P0410 code completely. erikv11 » The ECU doesn't check the pump directly, it checks the relay and the solenoid (which you leave in place in this procedure), and it checks the O2 sensor voltage to see if it drops as occurs when the air pump is working properly (the diode provides the small voltage drop to the proper ECU pins). The basic theory (but not the completely figured out modification) is here: http://volvospeed.com/vs_forum/topic/132158-sas-delete/ People have dropped in a resistor in place of the solenoid, your idea works for that. But the solenoid is pretty small, not a huge gain there. A great tutorial on eliminating the SAS system (secondary air system) and forever ending P0410. SAS Delete/Removal Tutorial (No CEL!)
- Installing 850, S70, V70, XC70 Cabin Air Filter
It's possible that it has been replaced but I don't ever recall having this done. This car was service by Volvo regularly up until 2008 when they gave us a $3500 list of things required to pass inspection. I'm starting to realize I can do many of them for a fraction of the cost (not fraction of the time) with help from this site. I will have to look through my very large pile of Volvo dealer invoices.
- Does the Air Pump (SAS) Really Do Anything?
My airpump has started to sound like a vacuum grinding up a cat. Of course, the noise only lasts a minute or so, then it stops and all is well. I guess I have 2 questions: 1. What does the air pump do? I ask this because the car runs no different before the thing kicks in and no different after it shuts off. 2. If nothing changes regardless of this thing being on or off, do I actually need it? Can is be simply unplugged and ignored? Some people may gasp and sputter at that last statement, this is an honest question looking for a direct answer...