Case IH 19032 – Engine Control Module (ECM) / EDC (Electronic Diesel Control): Exhaust Flap actuator: Feedback position negative deviation too high

The Engine Control Module (ECM) is commanding the exhaust flap to close to a specific angle, but the position sensor inside the actuator is reporting that the flap is physically stuck at a lower (more open) angle. This is typically caused by heavy soot or carbon buildup, a failing internal servomotor, or high resistance/voltage drop in the actuator wiring harness.

• Tier 4b
• Vestrum 100
• Vestrum 110
• Vestrum 120
• Vestrum 130

1. 1

   Verify the presence and correct connection of the Exhaust Flap Actuator to the CAN network.

2. 2

   Check for undervoltage, short circuits, or broken cables in the voltage supply harness.

3. 3

   Disconnect the actuator linkage or remove the assembly and manually actuate the exhaust flap by hand to check for heavy carbon binding.

4. 4

   Check the actuator for internal shorting or increased resistance, indicating a failed servomotor.

1. 1

   Preparation

   Ensure the engine and exhaust system are completely cool. Disconnect the tractor's battery to prevent accidental shorting of the CAN bus lines.

2. 2

   Access the Valve

   Locate the exhaust flap actuator assembly, which is mounted inline on the exhaust pipe downstream of the turbocharger.

3. 3

   Disconnect Lines

   Carefully clamp and disconnect the engine coolant lines routed to the actuator to prevent excessive fluid loss. Disconnect the electrical harness connector.

4. 4

   Remove the Actuator

   Remove the retaining bolts or V-band clamps securing the exhaust brake valve assembly to the exhaust pipe.

5. 5

   Clean or Replace

   If the valve was mechanically bound by soot, clean the housing thoroughly with a DPF/EGR carbon solvent. If the electronic actuator motor has failed, the unit must be replaced.

6. 6

   Reinstallation

   Install the new exhaust flap actuator using new exhaust gaskets/seals. Reconnect the coolant lines and electrical harness.

7. 7

   Calibration

   Reconnect the battery. Use the Case IH Electronic Service Tool (EST) to clear the fault codes and perform an actuator sweep test/calibration to allow the ECM to learn the new actuator's end-stops. Top off the engine coolant.