MarkJ
I am in the process of working on an ST02724ANAX (Nexus). I called support, and all they could throw me was to inspect both mag pickup (flywheel & cam) the cam mag pickup causes you to remove the enclosure, which is really time consuming. They also directed me (of course) to the Bosch actuator. I did all of that, and still the same. The customer is 87 miles from my base shop one way, with no cell service. One thing that jumps out at me is; when the unit runs at full rpm for exactly 2 minutes, you will hear a slight bump increase in rpm (+1Hz) and voltage of course (+1V), and within 5 seconds shuts down in the "Gov Fault". Due to the nature of the exact time each fault occurs and the slight increase in rpm, I have concluded the problem is the controller. I plan on returning very soon so any input will be appreciated.
Quote
Birken Vogt
What did you do to the Bosch actuator?  How many hours does it have?

If you did not replace it, you might need to.  I have found these extremely over sensitive if the actuator gets a little sticky spot in it.  If it gets even the slightest bit out of whack, governor fault.  The engine speed change is almost undiscernable.
Quote
cookelec
As already stated,I would do a complete check of the Bosch (remove and inspect) before replacing the controller. They can be bench tested for operation and feedback.
Quote
Peddler
What is the output voltage of the mag pick up while cranking and running?
Quote
MarkJ
Thank you for the input. To answer the questions regarding the Bosch actuator. Instead of following the diagnostic manual steps test# 68, I had one on board, which did not make a difference. I realized it could be a wire harness issue, but bet myself that it was not. When I returned, I was directed to follow the test #68 steps for the Bosch by "support". After wasting my time with that, and the prior direction from "support", I R/R the controller. Problem solved... So after spending about 6 hours of time from "supports" direction, one of the long standing "support" techs gave me 0.5 diagnostics + 0.5 labor and 2 trips travel... I feel so blessed... Thanks again for all the input in seeking to find a solution to this fix. I really do enjoy all the ideas and expertise here on this blog.
Quote