Had Similar Problem ; Did Emergency Stop in Reverse Gear ; Problem Solved !

I am having this same issue again and unfortunately I'm not sure what cleared it up the last time. I tested voltage and I'm getting 14.2 at idle so I know it's not lack of voltage. I can't visually see anything wrong with the sensors. What I did do was go out to the middle of nowhere and did an emergency stop as someone previously recommended and the abs did not work. Then I tried to accelerate and had my wheels spinning on loose gravel and that still didn't work, abs did not kick in. Problem only occurs once I start driving. I jacked up both rear wheels and put the car in D, and accelerated to about 40 mph, and started to brake and the abs unit did work and the light never came on. When I put the wheels back on the ground and started driving the light came back on. So not sure if this narrows it down for someone, but what could be going on? It's obvious the abs relays and wiring is ok because it works when the rear wheels are off the ground, but it stops working when the entire car moves.

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1990 190E 3.0L

Sounds like front ABS sensor problem if light doesn't come in when the rear wheels are in motion.

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All the sensors are the same, so measuring resistance at the connectors in the engine compartment is a quick check. Some time the connectors just become oxidized, and a shot of contact cleaner does the trick. Have you tried substituting a good OVP?

I did try substituting the OVP. When you say measuring the resistance at the connectors what do you mean? Do I test the magnetized end by the wheel hub and the end of that plug?

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1990 190E 3.0L

The ABS sensors have long leads that end in large connectors under the hood, one on each side. Measuring the resistance between the connector and ground will tell you whether both sensors match. Sometimes just undoing the connectors and cleaning with contact cleaner does the trick.

There was no continuity on the driver side sensor. Grabbed one from the bone yard with continuity. Installing now and will report back.

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1990 190E 3.0L

Problem has been resolved. Driver side sensor had no continuity.

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1990 190E 3.0L