John Deere 002795.13 – ECU: Variable Geometry Turbo Has Not Reached The Desired Position During Calibration

The fault code 002795.13 indicates that the Variable Geometry Turbocharger (VGT) actuator has failed its calibration process. The Engine Control Unit (ECU) initiated a calibration sequence to learn the actuator's full range of motion, but the actuator did not move to the expected minimum and maximum positions. This prevents the ECU from accurately controlling the turbocharger's vanes to optimize engine performance and emissions.

• 6R Series
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7R Series
• 8R Series
• 9R Series
• R4038
• 9510R
• 9770 STS

1. 1

   Thoroughly inspect the VGT actuator, turbocharger, and all associated wiring harnesses for any visible damage, corrosion, or loose connections.

2. 2

   Scan for any other active or stored fault codes that may be related to the VGT system, such as those for the position sensor, speed sensor, or control solenoid.

3. 3

   Verify mechanical freedom of movement by disconnecting the actuator linkage from the turbocharger and manually moving the turbocharger's vane control arm through its full range of motion to ensure it is not sticking, binding, or seized due to carbon buildup or mechanical damage.

4. 4

   Manually check that the actuator itself moves freely without obstruction.

5. 5

   Verify that the battery voltage is adequate (typically above 12 volts).

6. 6

   Using a multimeter, check for proper voltage at the VGT actuator's electrical connector. You should see a reading within 1 volt of the battery voltage between the power and ground pins.

7. 7

   Test the resistance of the VGT actuator's terminating resistor (if applicable) and check for open or shorted circuits in the CAN bus wiring between the ECU and the actuator.

8. 8

   Using the diagnostic tool, monitor the readings from the VGT actuator position sensor while manually moving the actuator to check for accurate and consistent voltage readings. Intermittent failures of the position sensor can cause this issue.

9. 9

   Inspect and test the VGT control solenoid, which uses engine oil pressure to move the actuator piston. Issues with the solenoid can prevent the actuator from moving correctly.

1. 1

   Address Found Issues

   Based on the diagnostic checks, repair or replace any faulty components. This may include cleaning the turbocharger's vane mechanism, repairing damaged wiring, or replacing a faulty position sensor or control solenoid.

2. 2

   Component Replacement (If Necessary)

   If the VGT actuator itself is determined to be faulty, it must be replaced. Disconnect the electrical connectors for the actuator and any associated sensors (like the turbo speed sensor). Remove the bolts (commonly four 10mm nuts) that secure the actuator to the turbocharger housing. Remove the linkage from the turbo's vane control arm. Install the new actuator, ensuring the area is clean and using a new gasket.

3. 3

   Perform VGT Actuator Calibration

   After any repair or replacement of a VGT system component, a calibration must be performed using a diagnostic tool. Connect the diagnostic tool (e.g., John Deere Service Advisor) to the machine. Navigate to the calibrations or system tests menu and select 'VGT Calibration' or a similarly named function. Follow the on-screen prompts precisely. The procedure may involve specific key cycles (e.g., key off for 2 minutes, key on for 30 seconds) or require the engine to warm up to a certain temperature to allow the ECU to learn the actuator's travel limits. The diagnostic tool will command the actuator to move to its fully open and closed positions and record these values.

4. 4

   Verification

   Once the calibration is complete, clear all fault codes. Start the engine and monitor the VGT system's performance under various operating conditions to ensure the fault code does not return.