New Holland 14021 – ADIC: Radar Ground Speed Circuit Issue

The Analog/Digital Instrument Cluster (ADIC) has detected an open circuit or a short to VCC (Voltage Common Collector) in the radar ground speed sensor's circuit. This indicates a loss of signal or an improper voltage reading, which affects tractor functions that rely on accurate ground speed measurement, such as slip control calculations.

• T5 Series
• Workmaster 50
• TL70A
• TL80A
• TL90A
• TL100A
• TM Series
• TS100A
• TS115A
• TS125A
• TS135A
• TG255
• Genesis 70 Series
• 5640
• 6640
• 7740
• 7840
• 8160
• 8240
• 8260
• 8340
• 8360
• 8560
• 8670
• 8770
• 8870
• 8970
• 9282
• 9482
• 9682
• 9880
• 9882

1. 1

   Ensure the battery voltage is stable (above 12.1V) and check for clean, tight ground connections, as low voltage can trigger erroneous codes

2. 2

   Visually inspect the wiring harness leading to the radar ground speed sensor for chafing, breaks, or corrosion, particularly where exposed to debris or vibration

3. 3

   Disconnect the electrical connector at the radar sensor and check for corrosion, dirt, or moisture on the pins and terminals

4. 4

   Check for an open circuit by performing a continuity test on the signal wire between the sensor connector and the corresponding pin at the ADIC connector

5. 5

   Check for a short to power by measuring the voltage on the signal wire at the sensor connector with the key in the 'ON' position (battery voltage should not be present)

1. 1

   Rectify wiring issues

   If diagnostic checks reveal a damaged wire (open circuit or short to power), repair or replace the affected section of the wiring harness. Ensure all connections are secure and protected from the elements.

2. 2

   Clean connectors

   If the connectors are found to be corroded or dirty, clean them using an appropriate electrical contact cleaner and ensure they are securely seated upon reconnection.

3. 3

   Replace the sensor

   If the wiring and connectors are in good condition and test normally, the fault likely lies within the radar sensor itself. Replace the radar ground speed sensor.

4. 4

   Clear fault codes

   After completing the repairs, use a diagnostic tool to clear the fault code from the ADIC's memory.

5. 5

   Verify repair

   Operate the tractor to ensure that the fault code does not reappear and that the ground speed reading is accurate. Perform a calibration procedure if required for your specific model.