Laser 4000 not measuring

[BoomerSooner]

I have a laserwash 4000 not measuring the rear of the vehicles. It just goes all the way to the end of the track. Sometimes it works just fine. Any suggestions?? Thanks!!!

 

[dreese]

Check your X26 mid limit switch - if it doesn't get that signal, it won't accept the rear eye input X21 and will go to the end of the rails.

 

[griffithia]

This post was a big help. I was having the same problem and it turns out my mid limit switch needed adjustment. The sensor was running a little further away from the flag on the driver side pass than on the passenger side.