Error Code Problem Solution
ER21
Wheel Angle Sensor > 4.7V
Description:
The wheel angle sensor is a 5V
hall effect sensor (works like a
potentiometer) that sends an analog
voltage to the Truesight controller. This
error is caused when the analog voltage
coming from the wheel angle sensor is
greater than
4.7V. To read the current
voltage, go to >>Diag>>Overview
>>Feedback Input
The wheel angle voltage remains stuck
at
4.78 ±0.05 volts when the wheel
angle sensor is moved.
Switch wires A & C in the harness that
connects to the wheel angle sensor to
reverse polarity.
The wheel angle voltage remains stuck
above
4.9 volts when the wheel angle
sensor is moved.
The signal wire (B) may be shorted
to the power wire (C). Find short and
correct.
ER
22
Wheel Angle Sensor < 0.3V
Description:
The wheel angle sensor is a 5V
hall effect sensor (works like a
potentiometer) that sends an analog
voltage to the Truesight controller. This
error is caused when the analog voltage
coming from the wheel angle sensor
is less than
0.3V. To read the current
voltage, go to
>>Diag>>Overview
>>Feedback Input
There is not
5V between pins A & C
of the Wheel angle harness (Unplug
sensor near rear axle to measure)
Unplug connector Y705 near the cab
and measure voltage between pins 1
& 3 of wire coming from combine. If
5V is present, there is a problem with
extension harness that runs toward the
rear axle. If
5V is not present, there is a
problem with main harness. Repair or
replace appropriate harness to supply
power to sensor.
Sensor is receiving
5V but there are not
more than 0.3 volts between pins A & B
of wheel angle sensor (back probe with
sensor connected)
Crop sensor failure, replace sensor
Sensor is receiving 5V but there is
not signal voltage on pin 13 of large
connector on Truesight base in cab
(check with back probes, Reference pin
2 for ground)
With harness connected and wheels
steering straight, back probe pins
1 & 2
of Y705 connector near cab. If 2.5V±1V
is not present, there is a problem with
extension harness that runs toward rear
axle. If
2.5V±1V is present, there is a
problem with main harness. Repair or
replace appropriate harness so signal
voltage returns to Truesight
2.
ER
23
Wheel Angle Swing < 1V
Description:
During “Wheel Angle” calibration,
Truesight asks you to center rear
wheels and press Enter, then turn all
the way to the right and press Enter. It
must see at least a
1V swing to learn
which way is right and proceed with
calibration.
Wheel angle changes less than
1V
when turning steering wheel from
straight to fully right. Check on VT
display, go to >>Diag>>Overview
>>Feedback Input
Check that wheel angle sensor is
correctly attached to axle to maximize
sensor movement.
Steering wheel was not fully turned to
correct location during calibration.
Redo the Wheel Angle calibration
per calibration instructions in this
manual and turn the steering wheel as
instructed
47
Diagnostics
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