MVS Forums superuser and ABS expert Matty Moo lays out these facts in trying to solve a particularly vexing ABS module mystery:
The 8619538 module works on other pre-CEM.
The other STC modules don’t want to work on CEM cars with the 8619538 module.
I’ve had no problems like this on the non-CEM cars.
You can put an AWD module on a pre CEM car with STC and it will work, along with the regular STC module.
8619538 module is soldered differently than all of the other Teves MK20 modules. You can open one up and see zero cracking on any of the pins, even using a magnifying glass. The only cars I’ve seen this module on is the CEM cars.
“two brake lines in from M Cyl., 4 lines out to wheels. Keep up with removed lines as they go back where they came from. The pump assy. is on a bracket and access is not great but not the worst either. Hose from air cleaner to turbo will need to be removed. The battery will have to be disconnected and the electrical box underhood on driver side has two bolts. One is under rear of air cleaner on inner fender and the other is hidden under the cables that meet in rear of that box on the stud that is part of box. Remove the two cables and the bolt is down in hole next to stud. Box slides towards the engine and comes out. Use WD-40 liberally on the connector and then it should come off (i guess you already passed that point…)”
The RPM are 840 on both “N” and “D”, however when I throw it on the “N”, the sound goes away.I tried, having it on “D” and holding the brakes, to raise RPM to about 1100, and that is when the noise is most evident.The best described it is a very low intensity roar and slight vibration.
As it’s been a couple of weeks just thought I would put in a final update. Car still running fine and mpg improved from average of 19 to 23. Had lots of changes in the weather and still running smooth.
My pump had two outlets on it – most aftermarket pumps have only one. I’m not sure where the second line goes, so I purchased a Volvo original with the two outlets. This is a good time to remove the T junction and extra tubing for the headlight washers which are most likely no longer working. Plug in the pump and test.