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Autopilot Fault 90 Valve Fet / coil Open
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Josh7
Posted 7/2/2020 17:04 (#8350051)
Subject: Autopilot Fault 90 Valve Fet / coil Open


The Netherlands
I have a Trimble autopilot with hydr, valve on a tractor controlled by a NAV 2 and a GFX750 diplay. Every time when I touch the line acquisition button or I touch the implement drift correction buttons this Fault 90 occurs and disconnect guidance. It never happens otherwise. Last year this NAV2 and valve were controlled by a FMX and this fault occurs only ones or twice a year. I have already changed the GFX for a CFX 750 and then it never happens.
My dealer first said it is a bad valve and now they think it is a bug in the coil resistance measuring. I don't understand it because the NAV 2 who steers the coils of the valve is still the same. I have updated the GFX 750 to the latest firmware but that gave no improvement.

My questions are:
Are there more people with the same problems ?
What kind of resistance should these coils have , so I can measure that.
Will the problem fixed by replacing the coils ?
Other suggestions ?

My dealer has now an other guy with a TMX with the same valve problem but is still waiting on an answer from Trimble
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