John Deere SPN 641 FMI 16 – Engine Control Unit (ECU): Turbo Actuator Temperature Moderately High

The Engine Control Unit receives a message from the Variable Geometry Turbocharger (VGT) actuator indicating that its internal temperature has exceeded normal operating specifications.

• 5085E
• 5090E
• 5090EL
• 5100E
• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 9230
• 9330
• 9430
• 9530
• 9630
• 3520
• 3522
• 540G-III
• 548G-III

1. 1

   Reduce engine speed and load immediately to prevent component damage

2. 2

   Check the cooling system and radiator grilles for debris that could restrict airflow and cause elevated under-hood and actuator temperatures

3. 3

   Inspect the intake air system and Exhaust Gas Recirculation (EGR) system for blockages, leaks, or faults

4. 4

   Check the VGT actuator sensor and wiring harness for melting, chafing, or poor ground connections

5. 5

   Remove the actuator and check if the turbocharger's sector gear turns freely by hand to determine if the issue is mechanical soot buildup or a failing actuator

1. 1

   Cool down machine

   Safely park the machine, turn off the engine, and allow the exhaust and turbocharger components to cool completely.

2. 2

   Clear debris

   Clear any debris from the radiator, coolers, and engine bay to ensure proper ambient cooling.

3. 3

   Inspect wiring

   Inspect the wiring harness leading to the VGT actuator. Repair any damaged wires or connectors.

4. 4

   Remove VGT actuator

   If the cooling system and wiring are intact, remove the VGT actuator from the turbocharger.

5. 5

   Check sector gear

   Manually actuate the turbocharger's sector gear. If it binds, the turbocharger must be removed and cleaned of soot, or replaced entirely.

6. 6

   Replace VGT actuator

   If the turbocharger mechanism moves freely, the VGT electronic actuator has failed internally and must be replaced.

7. 7

   Install new actuator

   Install the new VGT actuator using the appropriate installation hardware kit.

8. 8

   Calibrate actuator

   The new actuator must be calibrated to the turbocharger using John Deere Service ADVISOR or equivalent OEM diagnostic equipment.

9. 9

   Test run

   Clear the fault codes and test run the machine under load to verify the repair.