Can anybody explain the operation of the servo motor. DOes it only rotate clockwise? Does the valve rely on the spring to close it? What orientation is the cable pull suppose to be in, i.e. the slots for the cable should be located where?

Also,

I was reading about an LED under the ECM that will flash trouble codes? What is this all about? What will cause the computer to shut down?

if your servomotor fails the computer will put the ecm into limp mode and will flash a series of led codes...i cant remember what the one for servo is maybe 5 but im not sure.....it will bog like crazy not be too peppy and use about doube the oil...the servomotor turns in both directions it gets fed positive and negative 12volts from the ecm..it senses the fact that its moving with a 360 degree potentiometer ( which is the common part that fails on these ) the valve springs do pull the valves shut...hence the need for regular cleaning or they get stuck in the bores...there are a few posts on this subject in the archives..im not sure what you mean by the slots in the cables??...steve

Well, I'm getting no response from my servo motor. The motor does not move in any direction at any RPM. Unbolted the ECM and the LED is not blinking at all. Any suggestions?

simple test..start it, let it warm up good,, take the cover off the servomotor, put it up on a stand,, rev it up to approx 6400 rpm they should open,,,unbolt the ecm have someone look at the luight when you start it..make a note of how many flashes...write back with your results...steve

did you check the valves to make sure theyre free first??

This all stems from pulling apart the valves to clean them. Putting it all back together and it hasn't run right since. I pulled the motor cover to watch, with it on a stand no movement no matter what rpm's i'm running. Unbolted the ECM and watched it as it started no flashes what so ever.

Any ideas?

Thanks
Jason

its possible your servomotor is toast...know another cat owner you could take a known good one off of and try it?? by the way what sled are we talking about?? steve

heres a link to one of my previous posts about these things
http://www.hardcoresledder.com/forums/inde...wtopic=5192&hl=

trouble code for servomotor is 6 flashes

if alls fine with the cpu you should just get one flash...steve

I had problems with my servo motor on my 02 ZR 600 last year. It was way down on power. I took the cover off the servo motor to see what was happening. On startup the pulley moved back and forth 3 times and then it just quit. At the time I didn't know what that mean't. I was thinking it was a bad ECM. I sent a question to Greg Spaulding himself and he was kind enough to reply. He told me that if the servo motor moved back and forth three times on startup that it was detecting a problem and to make sure the cables were within spec and the same measurement. I had of course already checked them and they were in spec. so I hadn't given it another thought. HOWEVER, after hearing back from Greg I decided to look into the cables even further. I re-adjusted them (this time to the short end of the specifications instead of the upper end). That did the trick and I was back in business. It was a simple fix.

Based on what you stated I wouldn't assume it is a component failure problem. Try double checking your cable measurements and try to adjust them to the short end of the specification. Also, make sure the valves and cables move freely and aren't binding up. Good Luck.

OK, I went down to the dealer because I just wanted the sled fixed. Wiring was fine along with the rest of the components. They told me it was where the servo motor was positioned. That it needs to be positioned in a certain location to actuate. Does this sound right?