New Holland T8010 Manual page 1556

No signal from wheel speed sensor
Cause:
If the transmission controller detected the wheel speed sensor signal is too weak or does not exist, this fault code
will be recorded.
Possible failure modes:
1. Wheel speed sensor problem.
2. Wiring harness problem between the wheel speed sensor and the transmission controller.
Solution:
The wheel speed sensor is hard wired to both the transmission controller and the instrumentation controller. The
wheel speed is displayed on the ICU when Radar is not present.
1. Troubleshooting by viewing the Instrumentation display
Disconnect Radar if Radar is equipped. The wheel speed from the wheel speed sensor will be displayed when
tractor is running.
Drive the tractor at different gears and watch the wheel speed.
If the speed display is normal, the wheel speed sensor is fine. The problem is more likely in the wiring connection
from the sensor to the transmission controller.
If the wheel speed display stays at 0 when tractor is moving, go to next step.
2. Test the resistance of the transmission speed sensor:
Locate the transmission speed sensor on top of the transmission.
Disconnect connector C069 from the sensor.
Inspect the connector. Clean the connection.
Measure the sensor resistance between pin A and pin B.
The resistance should be around 3 k ohms.
If the resistance is much higher than 3K, the sensor coil may be damaged internally.
If the resistance is close to 0, there must be a shortage inside the sensor.
In either case, replace the transmission speed sensor.
If the resistance is close to 3k ohms, go to next step.
3. Check the wiring from the wheel speed sensor to the transmission controller.
Check continuity between pin A of connector C069 and pin 34 of connector 351.
Check continuity between pin B of connector C069 and the clean ground.
If there is no good continuity in either case, check for open circuit and wiring shortage.
NOTE: Pay attention to wiring damage, loose connectors, and bent pins.
4. Check the function of the wheel speed sensor
Take pin 34 out of connector 351 with all other part of harness connected, the signal from the wheel speed sensor
can be checked.
The signal from the wheel speed sensor is in sinusoidal form. The sensor has to be properly installed onto
transmission (turn all way in) to give enough signal.
With the key ON, but tractor not moving, the signal will show around 2.5 V DC and almost 0 V AC.
When tractor is moving, the DC voltage will remain the same and the AC voltage will jump to several volts
(depending on loads in the harness). The AC voltage will increase as tractor speed goes up.
If the wheel speed sensor functions normal, check connections from the sensor to the controller.
If the wheel speed sensor does not functions normal, replace the sensor.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 77
55-4-29