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SAS Air Pump Delete

Published on December 21, 2011 by Volvo5.0

There are several reasons you may need to complete this modification. If you own a 1997 or 1998 Volvo 850/S70 there is a good chance you will run into the dreaded EFI-442 EFI-446 EFI-448 check engine light. This modification will buy you some time. Deleting the SAS signal will allow the car to adjust fuel trim even though the SAS pump is not working. Whatever your reason for deleting the SAS system, this guide will walk you through it with images and video. Remember: TAMPERING WITH FACTORY EMISSIONS SYSTEMS IS A VIOLATION OF FEDERAL AND STATE LAW

If you wish to repair the airpump instead of by-passing it, please see: Airpump/SAS Repair. If you have a CEL on due to the SAS system, your vehicle is not able to adjust fuel trim properly. Fixing the system or by-passing it will restore lost mileage. This has been a joint effort with Volvospeed members IPD-Lucky and Flaco both contributing to this mod and obviously they both deserve a lot of the credit.

Start by removing the ECU and opening it up, by bending the 4 little tabs up. Then swing the hold down lever around and out of the way. You may need to pry it up slightly to do this. There is no need to remove any of the T8 or T10 Torx.


Diagram for SAS air pump bypass
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Once you're inside it's very simple, just find A32 and A37 and solder the diode in place. Again make sure the diode is pointing in the right direction. Any diode that can handle 1v or more will work, but in this review Radio Shack #1N4003 was used. When soldering use care not to drop any solder on the board, or bridge any pins other than 32 and 37.


Remove the ECU cover
Click Image For Larger View


Below you can see the diode installed, noting its alignment. When you are done, you may wish to apply a little liquid tape to the solder joints to help prevent a should should they break off. Low temp solder tends to work best here as pure silver is too brittle and not needed in this application.


Solder in the diode
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Removing the ECU is something thats as easy as opening the hood. However the first time you tend to be overly worried about breaking it. All the metal is fairly ductile and the locking lever is helpd in place to the plastic better than you would think. Even after 15 years. To help set you mind at ease though here is a short video on ECU cover removal.



How easy is this modification? So easy that the you can do it in 5 minutes if you leave all your tools out for someone else to pick up. Even with clean up, looking for solder, the trip to radio shack, and applying a band-aid after you cut yourself on the ECU cover this is well under an hour.



Still want more? See the discussion topic on Volvospeed forums: SAS Delete With Pictures

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