Case IH 17893 (F-1072-31) - ECU – Engine ECU: Internal ECU failure - Error in the release of the engine escape flap brake

The engine control module has detected an internal driver fault or an electrical malfunction preventing the proper release of the engine's exhaust flap brake (decompression brake).

• VESTRUM CVX
• Austoft 9900 Sugar Cane Harvesters
• CR Revelation series combines

1. 1

   Wait at least 2 minutes after shutting off the engine before disconnecting the battery to allow the SCR system purge cycle to complete

2. 2

   Inspect the exhaust flap mechanism downstream of the turbocharger for carbon buildup, binding, or mechanical failure that could cause the actuator to draw excessive current

3. 3

   Test the wiring harness running from the Engine ECU to the exhaust flap actuator for rubbed-through wires, shorts to ground, shorts to power, or open circuits

4. 4

   Test the resistance of the exhaust flap actuator/solenoid to ensure it is within OEM specifications and not shorted internally

5. 5

   Verify that the Engine ECU is receiving proper voltage and has clean, tight ground connections

1. 1

   Power down and disconnect battery

   Ensure the machine is powered down and the battery is disconnected (observing the 2-minute SCR purge rule).

2. 2

   Disconnect and inspect ECU harness

   Locate the Engine ECU and carefully disconnect the main harness connectors. Inspect the pins on the harness side for corrosion or spread terminals.

3. 3

   Remove faulty ECU

   Unbolt and remove the faulty Engine ECU.

4. 4

   Install replacement ECU

   Install the replacement Engine ECU and torque the mounting bolts to spec.

5. 5

   Reconnect wiring harnesses

   Reconnect the wiring harnesses, ensuring the locking levers are fully seated.

6. 6

   Reconnect battery

   Reconnect the battery.

7. 7

   Program new ECU

   Connect the EST (Electronic Service Tool) to the machine's diagnostic port. You will need to flash/program the new ECU with the correct software layer for the specific FPT Cursor 11 engine configuration (done via CAN 5 on the ECU).

8. 8

   Clear codes and test

   Clear the inactive fault codes and run the engine. Perform an active test of the exhaust flap brake to verify it engages and releases without logging the 17893 code.