Case IH F-518150-31 - ECU – Engine Control Unit (ECU / EDC): ECU internal failure - Post injection shut-off failure

This code indicates an internal hardware or software logic failure within the engine controller. Specifically, the ECU is unable to correctly command, verify, or terminate the 'post-injection' fuel event, which is typically utilized for exhaust aftertreatment processes.

• MAGNUM AFS Connect
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Austoft 9900 Series Sugarcane Harvesters
• Austoft A8810 Series Sugarcane Harvesters
• Puma
• Magnum
• Steiger

1. 1

   Verify the code using the Electronic Service Tool (EST) or diagnostic screen and check for related codes like 3758.

2. 2

   Clear the fault code from memory and road test the vehicle under normal load to see if it resets.

3. 3

   Inspect the battery, alternator, and ECU wiring harness for voltage spikes, drops, or high resistance that can cause false internal defects.

4. 4

   Connect the EST and attempt to re-flash the ECU with the most up-to-date dataset/calibration to rule out corrupted software.

1. 1

   Turn off the machine and disconnect the battery to prevent electrical arcing.

   Ensure the machine is completely powered down before beginning the ECU replacement.

2. 2

   Locate the Engine ECU.

   It is typically mounted directly on the side of the engine block, utilizing vibration isolators.

3. 3

   Carefully release the locking levers on the main wiring harness connectors and unplug them from the ECU.

   Ensure the connectors are fully released to avoid damaging the pins.

4. 4

   Remove the mounting bolts and remove the defective ECU.

   Keep the mounting hardware for the replacement unit.

5. 5

   Install the replacement or remanufactured ECU and torque the mounting bolts to OEM spec.

   Ensure the vibration isolators are properly seated.

6. 6

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

   Verify a secure connection to prevent future electrical faults.

7. 7

   Reconnect the battery.

   Restore power to the machine.

8. 8

   Program the new ECU using the Case IH Electronic Service Tool (EST).

   Crucial Step: A new or remanufactured ECU will be blank or locked. You must program it with the correct machine software, engine calibration dataset, and injector trim codes.