Service Manual

Multi Pro 5800 Page 6 − 73 Electrical System
The sensor operates on 5VDC supplied by the PVED−
CLS controller of the EHi steering valve. Signal voltage
from the steering position sensor (along with GeoLink
guidance information) is used by the PVED−CLS con-
troller to determine the appropriate direction and current
flow to operate the EHi steering valve. When the Au-
toSteer system is engaged, the steering position sensor
signals are constantly monitored by the PVED−CLS for
steering fault detection. If engaged, the AutoSteer sys-
tem will disengage if a signal from the steering position
is lost.
Testing
The steering position sensor and its circuit wiring can be
tested using the GeoLink display; refer to Calibrating the
AutoSteer Steering System in Chapter 8 − GeoLink
Spray System in this manual. If it is determined that the
sensor and circuit wiring are not functioning correctly,
proceed with the following test procedure:
1. Check the steering position sensor adjustment and
adjust as necessary; refer to Steering Position Sensor
in the Adjustments section of this chapter.
2. Raise and support the front of the machine; refer to
Jacking Instructions in Chapter 1 − Safety in this manu-
al.
3. Ensure the front wheel assembly is able to move
from full right stop to full left stop.
4. Disconnect the machine wire harness from the steer-
ing position sensor. Check the sensor and the harness
connector for damage or corrosion and clean or repair
as necessary.
5. Connect sensor connector pins 2 and 5 to a 5 VDC
power supply, and connect pins 1 and 4 to ground.
6. Ensure that the front wheels are aligned straight
ahead. Using a multimeter (DC voltage setting), 2.0 –
3.0 VDC should be present at both sensor connector
pins 3 and 6.
7. Turn the front wheel fully to the left (counterclock-
wise). Using a multimeter (DC voltage setting), the volt-
age at sensor connector pin 3 should be higher than
what was measured in step 6. and the voltage at sensor
pin 6 should be lower than what was measured in step
6. The amount of voltage increase at pin 3 should be ap-
proximately the same as the amount of voltage de-
crease at pin 6.
8. Turn the front wheel fully to the right (clockwise). Us-
ing a multimeter (DC voltage setting), the voltage at sen-
sor connector pin 3 should be lower than what was
measured in step 6. and the voltage at sensor pin 6
should be higher than what was measured in step 6. The
amount of voltage decrease at pin 3 should be approxi-
mately the same as the amount of voltage increase at
pin 6.
9. Replace the steering position sensor if necessary.
The sensor and the magnetic bolt are matched by the
manufacturer and must be replaced as a set.
10.Adjust the steering position sensor; refer to Steering
Position Sensor in the Adjustments section of this chap-
ter.
11. If the steering position sensor tests correctly and a
circuit problem still exists, check the machine wire har-
ness; refer to Appendix A in this manual.
12.After testing, connect the machine wire harness and
calibrate the steering system; refer to Calibrating the
AutoSteer Steering System in Chapter 8 − GeoLink
Spray System in this manual.