We have a service code (transmission output speed sensor) coming up intermittently. I have the service manual and diagnosis and test procedures. I have a question about testing at this connection pictured. Does anyone have any experience with these or similar machines? I'm not getting the expected response at the connector. I'm getting infinite resistance and there should be 1,200 ohms. Not only that but I get infinite resistance on all 4 of the transmission sensors so I think I HAVE to be doing something wrong.....but what?? Any help is appreciated.

 

To bad MMiller (Michael Miller) wasn't still an active member. He could probably help.

I do remember reading about the "M" series, that they had a lots of transmission RPM sensor problems, and you had to remove the whole transmission, out the rear, to replace those sensors. I think I read, there had been a few "updated" sensors, too.

I do remember reading, some years back, that the guys sure felt it was a crappy design, to hide these sensor INSIDE the tranny case housing, with no access from the outside, other than pulling the whole tranny. I think one guy, down South (Texas, I believe), mentioned he got pretty good at tranny removals, just to replace sensors.

Sorry, not much help.

Just because you are getting service code doesn't mean you can't run the machine.Had a D6R with the same problem run it for several years until it was oil change time in the trans then i did the speed sensors then.There is updated sensors and new harness update,at least on D6R.MIne is 1998 5L machine.

Actual on the R they have two sets of speed sensors(4all togather) for like a backup for the first one if it completely goes bad.Ususal issue is is hard shifts.Other issues is if your getting a lot of plate wear,plus dirt etc. they plug up the speed sensors and then start getting codes sometimes.

There are another one or two speed sensors on an R that will throw a code.I believe one is the priority speed sensor it is on the outside of the trans and has more to do with the brake side of things.

If everything seem it work with in reason then i wouldn't worry to much about the speed sensor code.Might get oil sample to see if you have other problem.

When they completely give up the machine will let you know ,hopefully it won't be in the bottom of a pond.Good luck

Lost my long post timed out on me.See if the AMC button is on(dash).It will downshift the machine automacticly.I lock mine out and shift it manually.If not something to do with that,then would look for stuff in the speed sensors.Good luck