Motorcycle Questions? Ask a Mechanic.
When you replaced the angle sensor, did you preload the sensor? And after installing did you reinitialize the system?
Allow me to backup for a second to make sure we are talking about the same machine. Is this the foreman rubicon, or just simply the foreman ES.
the foreman es can only be shifted by buttons on the handlebar, the rubicon has and Auto shift mode, and the buttons on the handlebar
ok, this doesnt require the items mentioned earlier then. Does your gear indicator flash -- at all? Or did you have an previous codes before replacing the angle sensor?
ok, usually the computer is pretty good about picking up a faulty sensor or Control unit or something. This is very possible to be mechanical. On the front of the motor, there is the small electric shift control motor. That motor bolts to a small reduction gear cover. You will need to inspect those reduction gears to see if there is a chipped tooth on one of the gears to see if they are allowing the shift motor to move the shift mechanism in full swing. there is no oil in that cover so you should be able to unbolt it and take the small gears out and check them. If those gears check out fine, you will unfortunately need to look to the engine components to see where the problem is. first off you will need to make sure you have a good healthy battery. a weak battery on these will affect the shifting, also a that the contacts and armature in the control motor are in good shape. but if in manual shift you cannot get the gear shifting to work well then likely the problem is in those reduction gears, or the shift mechanism, and worse case scenario the shift drum/shift forks. if the reduction gears check out fine, the shift mechanism will need to be the next item to check. the front engine cover will need to be removed. this does contain the engine oil, so the oil must be drained. Once the cover is off you will notice both the centrifugal clutch, and a transmission clutch. those will need to be removed, the centrifugal clutch requires and special puller to pull it from the shaft. With those off you will notice the shift shaft has a plate system that turns the shift drum. Sometimes one of the pawls will fracture and cause shifting issues. If the problem is not there then its likely the motor will need to come completely apart and the shift drum/and shift forks inspected.
so i would definately inspect those reduction gears and make sure all those other items are in good working order. If not then that would be the nexts steps needed to identify the issue.
after rating you are able to revisit this thread and I can help you further. good luck