SAS pump resistance

Post by **mkc1** » 26 Mar 2018, 15:55

Hi All,
I have the usual code for the SAS pump failure. I pulled the one off my parts car and checked it with a voltmeter and it's not showing any continuity between the blue and black wires coming out of the motor. My cheap voltmeter only reads up to 400Ω though, so there could be some connection if the resistance is more than that. Anyone know what these usually read? I don't want to put this one in my main car just to find out it's bad too.
Thanks!

Post by **RickHaleParker** » 26 Mar 2018, 17:57

The resistance should be way under 400Ω. The resistance on my S90 SAS is 400mΩ (0.4Ω). If you cannot get a reading in a 400Ω range, the pump is electrically open.

If you do need to buy another one .. some Volkswagen SAS pumps are compatable.

Post by **misha** » 27 Mar 2018, 05:32

Bmw sas pumps too.

Post by **MrAl** » 27 Mar 2018, 09:16

Hello there,

When i went to test my pump i found that 10 amps at 12v was not enough to run the pump, i needed more like 15 to 20 amps. At 20 amps, that would make the pump 12/20 or 0.6 ohms, which is less than 1 Ohm.

The thing is though, motors like this have brushes and brushes do not always make what we can call a "low voltage" contact even though they make a higher voltage contact just fine. By low voltage i mean 1v, and by higher i mean 12v. The 12v can tunnel through the slight oxide barrier that could be present while the test meter 1v may not be able to. In other words, you may have to test with a 12v power supply like i did or else the brushes could make the motor look "open".
If you have access to the shaft, you could also try to give it a spin. That could make the brushes make better contact again and may even get the pump going again if it is not really open for good!

So first try spinning the shaft to see if you can get it going again. That may get it working for another year or more. If it is really bad though that wont help of course.

Good luck with it.

WhatAmIDoing · Post by **WhatAmIDoing** » 27 Mar 2018, 09:28

Why not just do the SAS delete outlined here? Will pass inspection without it functioning.

Post by **mkc1** » 27 Mar 2018, 09:45

Thanks, all. Good point about the low voltage contact -- I have had that trouble with old pipe organ keyboard contacts. They work fine at the 12V originally used, but try to use then with low voltage SSL stuff, and they're not reliable.

I was able to take the small end off my spare motor and try to spin the shaft -- seems quite stuck. Also got better access to the electrical contacts and still nothing. I suppose it's possible that my main one isn't dead -- could be the relay or the connection to the ECU -- should probably check those out before replacing it.

Thanks for the tips re: the VW and BMW pumps as well. Sounded like more trouble than it was worth, but after looking at how much a new Volvo one cost, I might change that assessment. I might manage to rationalise/justify deleting it with the diode trick as well.

Thanks again!

Post by **mkc1** » 27 Mar 2018, 09:48

WhatAmIDoing wrote: ↑27 Mar 2018, 09:28 Why not just do the SAS delete outlined here? Will pass inspection without it functioning.

Mainly because it's dishonest and, in some cases, illegal. However....when I've had the emissions checked before it's always been well below what's allowable. So I might be able to convince myself that spewing out some extra pollution during warm-up is made up for by being well under the allowable limits at other time....maybe.

Post by **RickHaleParker** » 27 Mar 2018, 11:12

Why not just do the SAS delete outlined here? Will pass inspection without it functioning.

I did a quick read of the Ontario Drive Clean regulations. It specifically states, emission equipment cannot be removed.
My interpretation is, the vehicle must have the OEM emission equipment to pass the Ontario Drive Clean inspection .... unless one can qualify it for the "Hot Rod" exception.

Post by **mkc1** » 27 Mar 2018, 12:02

Thanks Rick. Do you have a link for that? I can't find anything about removal of emissions equipment except on the Hot Rod page.
Thanks!

Post by **mkc1** » 27 Mar 2018, 12:13

Well, the Ontario Environmental Protection Act says this, and it seems pretty clear:

7. (1) If a motor or motor vehicle is manufactured with a system or device to prevent or lessen the emission of any contaminant, including an on-board diagnostic system designed to identify motor or emissions control system problems and regulate motor or emission control system operations, the following standards are prescribed as additional maximum emission standards for the vehicle:

1. The system or device, or any replacement therefor, must be maintained or kept in such a state of repair that it is capable of performing the function for which it was intended.

2. The system or device, or any replacement therefor, must be kept installed on, attached to or incorporated in the motor or motor vehicle in such a manner that, when the motor or motor vehicle is operating, the system or device functions in the manner in which it was intended to function. O. Reg. 343/01, s. 6; O. Reg. 191/10, s. 7.