John Deere 000974.03 – ACU: Throttle Position Sensor Signal Voltage Out of Range

The system has detected that the voltage signal from the hand throttle position sensor is outside of its expected range (either too high or too low). This indicates a hand throttle circuit voltage problem that interferes with the proper operation of the throttle control system.

• 7720
• 7820
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• 7630
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• 8130
• 8230
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• 8530
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1. 1

   Restart the tractor by shutting down the engine, placing it in park, and restarting to see if the diagnostic trouble code clears (resets communication messages)

2. 2

   Visually inspect the wiring and connectors associated with the hand throttle position sensor for any signs of damage, corrosion, or debris

3. 3

   Ensure that the connector for the throttle position sensor is securely fastened, as a loose connection can cause intermittent signal loss

4. 4

   Test the throttle position sensor voltage using a multimeter by checking for a reference voltage (usually around 5 volts), then monitoring the signal voltage as the throttle is moved to ensure it changes smoothly without spikes or dropouts

1. 1

   Safely Park the Machine

   Lower all equipment, stop the engine, and remove the key. It is also recommended to disconnect the battery ground strap.

2. 2

   Locate the Sensor

   The hand throttle position sensor is located on the hand throttle assembly in the operator's cab.

3. 3

   Disconnect the Electrical Connector

   Carefully disconnect the wiring harness from the sensor.

4. 4

   Remove the Old Sensor

   The sensor is typically held in place by screws or bolts. Remove these fasteners and take out the old sensor.

5. 5

   Install the New Sensor

   Mount the new sensor in place and secure it with the fasteners.

6. 6

   Reconnect the Electrical Connector

   Reconnect the wiring harness to the new sensor.

7. 7

   Reconnect the Battery and Test

   Reconnect the battery ground strap, start the tractor, and check if the fault code has cleared. Operate the hand throttle to ensure it is functioning correctly.

8. 8

   Calibration (if required)

   Some new sensors may require calibration. This procedure would be outlined in the official service manual.