Wave Form Library

[mkov608]

Is anyone aware of a library for Rotax sensor wave forms? I'm troubleshooting a CPS sensor fault and need a good reference for what the sensor wave form should look like.

Thanks!

 

[mkov608]

Ok. Just in case you were wondering what a good looking CPS sensor wave form looks like. Here's one. Both samples time base ... 20ms. We should start a wave form library on the forum.



Now here's the one from a 2017 GTR that's throwing a C2111 fault code (erratic CPS). Notice the drop outs. The drop outs are intermittent, so I don't believe it a damaged encoder wheel. Ski-Doo ... thoughts?

 

[ski-d00]

Are all the dropouts perfectly spaced off the centerline with about equal amplitude? Is there any pattern of dropouts with the 34 teeth or the 2 open spots on the encoder wheel at any constant rpm? Is it idling perfectly?

Check wiring and connections and look for damaged circuits or terminals. Change spark plugs to rule it out.

 

[mkov608]

Test was performed on one known good ski, and one with the C2111 fault.

Wave forms captured, during cranking the engine in the flood mode (full throttle). Drop outs are intermittent. It is not idling very well.

A new CPS will be here on the 7th.

 

[ski-d00]

What did new plugs do?

 

[mkov608]

There on order, but I don't think that's the issue. If you look at the scans, you can clearly see drop outs while the engine is cranking and coils and injectors are disabled in the flood crank mode.

 

[mkov608]

It was the CPS. Here's the old wave form (as a reminder).



Here's the new sensor wave form.



The ski runs much better now. I'll take it out on the river within the next few days.

 

[mkov608]

Back from the river! It's all good ... just need to burn the old gas out of the ski. Wow! This thing is much faster than my old GTX!