John Deere 3673.31 – ECU: Exhaust Throttle Actuator Desired and Actual Position Mismatch

The engine's control system has commanded the exhaust throttle actuator to move to a specific position, but the sensor is reporting that the actuator has not reached that target. This mismatch is typically caused by heavy soot buildup physically binding the actuator linkage/valve, or an internal failure of the actuator motor/sensor itself.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 5045E
• 6105E
• 550K XLT Dozer
• 210G Excavator
• 210GLC Excavator

1. 1

   Inspect the exhaust throttle valve and actuator linkage for excessive soot or carbon buildup that could be physically jamming the valve

2. 2

   Disconnect the linkage from the actuator and manually move the exhaust throttle valve to ensure it moves freely without binding

3. 3

   Inspect the wiring harness and the electrical connector at the exhaust throttle actuator for signs of melting, corrosion, or loose pins

4. 4

   Verify that the actuator is receiving proper supply voltage, as related codes indicate supply voltage faults or circuit resistance issues (e.g., 003465.31 or 000641.31)

1. 1

   Preparation

   Turn off the engine, remove the key, and disconnect the battery ground cable.

2. 2

   Disconnect Electricals

   Locate the exhaust throttle actuator near the turbocharger exhaust outlet and disconnect its electrical wiring harness.

3. 3

   Remove Linkage

   Remove the lock nuts and disconnect the linkage connecting the actuator to the exhaust throttle valve.

4. 4

   Dismount the Actuator

   Remove the flange nuts/cap screws (typically 4) securing the exhaust throttle actuator to its mounting bracket or flange.

5. 5

   Clean and Inspect

   Remove the actuator and the exhaust gasket. Thoroughly clean any soot or carbon buildup from the exhaust tube and the throttle valve assembly.

6. 6

   Install New Actuator

   Mount the new exhaust throttle actuator using a new exhaust gasket. Install the flange nuts and tighten them to the OEM specification (e.g., 20 N·m or 177 lb.-in. for standard 4.5L/6.8L engines).

7. 7

   Reassemble

   Reconnect the linkage to the exhaust throttle valve and the actuator. Reconnect the electrical harness.

8. 8

   Calibration

   Reconnect the battery. Use a John Deere Service ADVISOR diagnostic tool to clear the fault codes and, if required by the ECU, perform an 'Exhaust Throttle Actuator Learn/Calibration' procedure so the ECU can learn the new actuator's end-stops.