I replaced the gasket on my differential because of a leak and now my abs is acting up. I read the fsm and it seems to lead to the speed sensor not being seated properly. I went back over and made sure it was in all the way and still the problem persists. Is this part known to give problems after having been removed and reinstalled? If I have to replace it, do I need to use a special sealant? I've heard of some sensors being sensitive to different substances...Is this one of them? '91 4Runner V6

Interesting.
The speed sensor on you your truck is most likely the magnetic pick-up on the top of your diff. Is this the part you re-sealed? That pick-up sits very close to the ring gear teeth. Its possible that it is now sitting too far away from the ring gear for a proper signal. I suppose it's also possible that re-sealing the diff case to the axle now has too thick of a seal causing the same issue, but unlikely. As far as that pick-up, it's not RTV dependant.

Ya it is deffinately the magnetic pick up type and yes it sits close to the ring gear. I took it back off yesterday and re-seated it and I am near positive that it is in all the way. I sprayed some carb cleaner on a rag and wiped it clean to get all of the shavings off of it the first time and since then it has been acting up. I am going to kick myself if for some rerason the solvent some how absorbed through the encasement and screwed it up. This piece is pricey and I really do not want to have to purchase another one.

Another thing is that the ring gear is a bit chip on its outer most edge in about a 3" area. How this happened I do not know because otherwise everything looks great in there. This is my latest cause but I do not know why it would not give me problems before. I guess that the metal shavings that were there, could have actuall helped it to sense the ring gear moving, and now that it is all clean it is probably reading better, therefore senseing the chipped area. I am going to check all the continuity points today, and see if the sensor is within spec. If it is not, then it would be a funny coincidence that it went out just because, I am more thinking that the carb cleaner soaked rag may have screwed it up. If so I will check back in and this may be something to watch out for, the sensor is around $200.00 and if solvent or rtv screws w/ it, this becomes a pricey user error.

I still don't believe that a cleaner would affect it in a negative way. Have you disconnected your battery for a few minutes, in case this is a "stored" error? I'd give it a shot. Don't know if it would help, but its free and easy to try. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Ya, I'll see if I can pull some codes also. Definately worth a try. Thx

No codes, reset everything to no avail. Did not have much time to go through the all the fsm instructions, will do tomorrow. If any interest, reply or I'll just let the thread go.