New Holland 3867 – Engine ECU (EDC): EVGT System Failure (Spare)

This fault indicates a malfunction within the Electronically Variable Geometry Turbocharger (eVGT) system. The 'spare' or 'reserve' designation typically means the actuator or controller has logged an internal diagnostic error state that is unassigned to a specific physical parameter (such as temperature or voltage). This often points to an internal actuator fault, a communication timeout, or a mechanical binding issue that the actuator cannot resolve.

• T6
• T7
• T8
• T9
• SP280
• SP480
• B90B
• B115B

1. 1

   Inspect the wiring harness and the electrical connector at the eVGT actuator for corrosion, backed-out pins, or wire chafing.

2. 2

   Verify that the actuator is receiving proper power and ground. Test the CAN bus communication lines (CAN HIGH and CAN LOW) between the engine ECU and the eVGT actuator for continuity and proper voltage.

3. 3

   Check for mechanical binding caused by carbon buildup in the exhaust housing. Verify if the actuator linkage can move freely (if accessible). If the vanes are physically jammed, the actuator will fail to position them.

4. 4

   Connect the New Holland Electronic Service Tool (EST) to check for ECU software updates or related codes (such as 3868 for EVGT temperature or underboost codes) that might provide more context.

1. 1

   Preparation

   Disconnect the machine's battery to prevent electrical shorts. Allow the engine and exhaust system to cool completely.

2. 2

   Drain Fluids

   If replacing the entire turbocharger, drain the engine coolant and engine oil to prevent spills when disconnecting the turbocharger supply lines.

3. 3

   Disconnect Electricals

   Unplug the wiring harness from the eVGT actuator.

4. 4

   Remove Piping

   Loosen the clamps and remove the air intake pipe and the compressed air outlet pipe leading to the intercooler.

5. 5

   Disconnect Fluid Lines

   Remove the turbocharger lubrication oil delivery/return pipes and the coolant inlet/outlet lines.

6. 6

   Unbolt Turbocharger

   Remove the V-band clamps securing the exhaust piping to the turbocharger. Unbolt the turbocharger from the exhaust manifold and carefully remove the unit.

7. 7

   Installation

   Mount the new eVGT turbocharger assembly using new mounting gaskets.

8. 8

   Reassembly

   Reconnect the exhaust V-band clamps, oil lines, coolant lines, and air pipes. Ensure all connections are torqued to OEM specifications and use new seals/O-rings on the fluid lines.

9. 9

   Reconnect Electricals

   Plug the harness back into the new eVGT actuator.

10. 10

    Refill and Calibrate

    Refill the engine oil and coolant. Reconnect the battery. Connect the New Holland EST diagnostic tool to clear the 3867 fault code and perform any required actuator relearn/initialization procedures before starting the engine.