John Deere 000103.06 – ECU: Turbo Speed Error

The Engine Control Unit (ECU) has detected a low resistance in the turbocharger speed sensor circuit, indicating a potential short circuit in the sensor or its wiring. The ECU monitors turbocharger speed to ensure optimal engine performance and to protect the turbo from overspeed or other damaging conditions. When this fault code is active, the engine's power may be limited.

• 8130
• 8225R
• 8230
• 8230T
• 8245R
• 8270R
• 8295R
• 8295RT
• 8320R
• 8320RT
• 8330
• 8330T
• 8345R
• 8345RT
• 8430
• 8430T
• 8530
• 9230
• 9330
• 9430
• 9530
• 9630
• 210G
• 240D
• 250G
• 270D
• 290G
• 350G
• 380G
• 524K-II
• 544K-II
• 624K
• 644K
• 724K
• 744K
• 824K
• 844K
• 9770 STS
• 4930

1. 1

   Place the tractor in park or shut the engine off, then restart the machine to see if the code was triggered by a temporary communication glitch

2. 2

   Visually inspect the wiring harness leading to the turbo speed sensor on the turbocharger for signs of damage, such as chafing, melting, or corrosion on the connectors

3. 3

   Check for any other active diagnostic trouble codes related to the turbocharger or other engine sensors that could provide additional diagnostic clues

1. 1

   Access the Turbo Speed Sensor

   The sensor is located on the turbocharger. Access may require removing heat shields or other components. For example, on a 9770 STS combine, the actuator and sensor can be accessed from the side of the engine bay after removing shields.

2. 2

   Disconnect the Sensor

   Carefully disconnect the electrical connector from the turbo speed sensor.

3. 3

   Test the Circuit

   Test the wiring for shorts to ground or other wires, which is the likely cause of a 'low resistance' fault.

4. 4

   Replace the Turbo Speed Sensor

   If the sensor itself is determined to be faulty, it will need to be replaced. This usually involves removing a single bolt and pulling the sensor out of the turbocharger housing.

5. 5

   Install the New Sensor

   Install the new sensor, ensuring it is seated correctly, and tighten the retaining bolt to the manufacturer's specification.

6. 6

   Reconnect and Clear Codes

   Reconnect the electrical connector. After replacement, use a diagnostic tool to clear the fault code from the ECU.

7. 7

   Perform Relearn/Calibration (If Necessary)

   Check if a relearn procedure is necessary for the speed sensor on the specific model being serviced so the ECU can learn the new part's position values.

8. 8

   Verify the Repair

   Start the engine and check if the fault code returns. Operate the machine under normal load to ensure the issue is resolved.