Case IH 19033 (F-518695-14) - ECU – Engine ECU: Exhaust flap stuck during power up test

During the machine's key-on power-up sequence, the system commands the exhaust flap to sweep its full range of motion to verify functionality. If the flap binds, fails to move, or cannot reach its target positions, the system logs this fault code.

• VESTRUM CVX
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Magnum series Tractors (250, 280, 340, 380)
• Puma series Tractors (240 CVX)
• Vestrum series Tractors (100, 110, 120, 130)
• Farmall series Tractors (40, 45, 50, 115U)
• Austoft A9900 Sugarcane Harvesters

1. 1

   Check for related codes (e.g., 19034 or 19035) that point to electrical or communication failures rather than a mechanical bind

2. 2

   Turn the key to the ON position (engine off) and listen near the exhaust for the actuator attempting to sweep

3. 3

   Inspect the actuator's stainless steel return spring for breakage caused by extreme heat and wear

4. 4

   Check the butterfly valve inside the exhaust pipe for heavy soot and carbon buildup that can physically jam the flap

5. 5

   Inspect the electrical connector at the actuator for melted pins, corrosion, or wire chafing

1. 1

   Cool down machine

   Park the machine on a level surface, turn off the engine, and allow the exhaust system and engine coolant to cool completely.

2. 2

   Disconnect battery

   Disconnect the negative battery cable.

3. 3

   Locate exhaust flap assembly

   Locate the exhaust flap assembly, which is typically mounted inline between the turbocharger and the DOC (Diesel Oxidation Catalyst).

4. 4

   Disconnect electrical connector

   Disconnect the electrical connector from the exhaust flap actuator.

5. 5

   Disconnect coolant lines

   Clamp off the engine coolant supply and return lines routed to the actuator to prevent excessive fluid loss, then disconnect the lines from the actuator.

6. 6

   Remove support bracket bolts

   Remove the upper retaining bolts securing the exhaust flap support bracket.

7. 7

   Remove V-band clamp

   Loosen and remove the V-band clamp securing the exhaust flap assembly to the turbocharger/exhaust front pipe.

8. 8

   Remove exhaust flap assembly

   Remove the exhaust flap assembly from the machine.

9. 9

   Inspect and clean or replace

   Inspect the internal flap. If it is heavily carboned but mechanically sound, cleaning it with EGR/carbon solvent may unstick it. If the actuator motor is burnt out or the internal spring is broken, the assembly must be replaced.

10. 10

    Position new/cleaned assembly

    Position the new/cleaned exhaust flap assembly against the turbocharger and loosely install the V-band clamp.

11. 11

    Install support bracket bolts

    Install the support bracket bolts and torque them to 37 - 49 N·m (27.3 - 36.1 lb ft).

12. 12

    Tighten V-band clamp

    Tighten the exhaust V-band clamp securely.

13. 13

    Reconnect coolant lines

    Reconnect the coolant supply and return lines, then remove the hose clamps.

14. 14

    Reconnect electrical connector

    Reconnect the electrical connector.

15. 15

    Top off engine coolant

    Top off the engine coolant to replace any lost fluid and bleed the cooling system.

16. 16

    Test and clear codes

    Reconnect the battery, turn the key to ON to allow the ECU to perform the power-up test, and clear the fault codes.