Ag Leader GeoSteer Operation Manual - Manual (Page 82)

Steering Components
68 GeoSteer System
• Raw Counts – This is the reading that is sent from the Wheel Angle Sensor. This value should increase and decrease
smoothly as the steering wheel is turned left and right. If it does not move there is a problem with the Wheel Angle Sensor
communications and this will need to be solved before the system can AutoSteer.
• Zero Curvature – Pressing this button will start a Wheel Angle Sensor test procedure to see if the calibration information
is still valid.
Zero Curvature
After the Wheel Angle Sensor has been calibrated, the system should be able to know exactly what angle the steering axle
needs to be at in order to drive a straight line. This test is designed to provide a quick verification that the Wheel Angle Sensor
calibration is valid. If the vehicle stops steering properly, this test can be run to verify that the Wheel Angle Sensor is still
working correctly. If the Wheel Angle Sensor, its brackets, or linkage rods have been damaged or altered, this test will be able
to show that the calibration is no longer valid.
If this test fails, check the Wheel Angle Sensor components for physical damage and that the steering axles are working
properly. Recalibrate the system and see if that solves the issue.
Use the following procedure to use the Zero Curvature test.
1. Press the Zero Curvature button to start the test.
2. Find a location where the vehicle can be driven in a relatively straight line for 10 seconds at the normal operating speed of
the vehicle. Verify that all bystanders are away from the vehicle.
Figure 2-73 Zero Curvature Test
3. Start driving the vehicle in a straight line and then press the Start button.
4. The vehicle should drive in a straight for about 10 seconds. At the end of the countdown, the test will give one of two
following results.
Figure 2-74 Wheel Angle Sensor Calibration is Good