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FMX steering problems
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Posted 9/14/2022 13:47 (#9844066 - in reply to #9843820)
Subject: RE: FMX steering problems

Autopilot system fault code 85 "Coil Short Slew Detected"
A critical Autopilot system fault has occurred. This fault occurs when the coil shorted detection logic detects
steering angle movement that is opposite to the commanded direction. The fault condition must be cleared to
resume Autopilot system operation.
Possible failure modes
This fault occurs when the coil shorted detection logic detects steering angle movement that is opposite to the
commanded direction.
Note – If this is a very intermittent problem, use the display to clear the controller fault and continue to operate.
1. Clear the fault code:
a. On the display, check the fault detail.
b. Record the fault code and then select OK.
2. Check the controller firmware version. See page 16.
3. Depending on the situation, try the following solutions:
– Check whether the manual override sensitivity is set too low (see page 112). The Autopilot system's manual
override sensitivity setting controls how hard you must turn the steering wheel before the movement is
detected by the system, and automated steering is disengaged. If the sensitivity is set too low, the system
will not detect when you turn the steering wheel. However, the Autopilot controller will detect that the
steering wheel has turned in the opposite direction to that which was expected, and the system returns
Fault Code 85.
– Check whether the steering pot is calibrated incorrectly or not calibrated (see page 112). Vehicles using the
steering pot as the steering sensor may be incorrectly calibrated. The NavController II /NavController III
does not know in which direction the wheels are turning, causing Fault Code 85.
– Check whether the steering valve cables are wrongly connected (see page 112). When installing the
Autopilot system, the steering valve cable connectors were connected to the opposite (wrong) side of the
Check whether there is a defective valve solenoid or cable (see page 112):
– The valve solenoid may have failed, causing a valve short.
– The cable may be damaged, causing a short in the electrical system.
– Check whether the AutoSense device is initialized incorrectly (see page 112). The NavController II /
NavController III Autopilot system using the AutoSense device must be initialized prior to calibration. If the
initialization process is not completed, the correct direction is not established, causing Fault Code 85.
4. If the fault is still not resolved, contact Trimble Support.
Manual override sensitivity
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