Abs light stays on trailer.

Last shop checked the bearings and tone ring. I dont know if they pushed the sensor in or not but the TA did today

 

I would replace the extension wire from the sensor to the ecu first, might be broken wire, then the sensor, if need be. If it’s a sensor with a long wire, replace the whole thing.

 

That's exactly what I wanted them to do but of course they didnt

 

I replaced my sensor first, only to find the wire lead was bad. Later the sensor backed out of the bracket, had to knock it back in. Usually it’s a broken wire. Sensor itself doesn’t go bad. The codes Y1, Y2, depend on which way the valve is mounted. Can be either side, depending

 

How did you determine the wire was bad

 

I just replaced it. I guess you could switch two of them , see if the code changes. I just replaced both of mine, kept the 1 good one as a spare. Ended up using it a few weeks later, when one of the new ones got damaged. They come in different lengths 6’, 10”and 16’, or so. Only costs about $25, if I recall.

 

Did you have to get it from a trailer shop

 

Yes, Dealerships, Truck stop shops, Fleetguard. I don’t know how to post a link. But here’s the website, to help identify which ecu, type and which way it’s mounted, and codes. Meritor, the other one wabco, I used for my Truck, had the same problem My trailer also had a bad main harness going into the ecu. No power to diagnostic light. Had to get light working, then get it to go off. Each time you fix a problem, must drive it over 3-5 mph, to get light to turn off. If there’s a second problem it will come on again, and blink codes need to be checked again. Key on key off, key on key off key on- count blinks on little red light, on back of trailer. Both sites have all the procedures. I have the 4/2 system. The simplest of them all. Only has 2 sensors. Some have 4, first you need to identify which ecu, and which way it’s mounted. I mistakenly replaced the wrong side, also replaced sensors till I figured it out. Just a broken wire somewhere in the lead wire to sensor. Very small wires, can’t tell it has a break, unless you see physical damage.

 

Wcoastent.com for trailer

 

Try the top web address. Let Me know if you get to the Troubleshooter. If not, maybe I can figure out how to send a link