Case IH 17667 (F-518203-31) - ECU – Engine Control Unit (ECU): ECU Internal failure - Injection Cut Off request from Shut Off Path Test

This indicates a critical internal hardware or software failure within the engine's control module. The ECU continuously runs a 'Shut Off Path Test' as a safety mechanism to ensure it can successfully cut off fuel injection if an emergency shutdown is required. When this code is logged, the ECU has failed this internal self-test and is actively requesting an injection cut-off to protect the engine.

• VESTRUM CVX
• Case IH Austoft 9900
• Case IH Axial-Flow Combines (AFX 7240, 7250)
• Case IH Farmall Tractors (40-45-50 models with Cab and CVT)

1. 1

   Connect your diagnostic tool and erase the Level 2/3 error from the fault code memory

2. 2

   Operate the vehicle for a short distance (e.g., a few kilometers) or run the machine under load to check the operation point

3. 3

   Monitor the system to see if the error reappears to rule out a temporary software glitch

1. 1

   Evaluate test drive results

   If the fault code does not return after the test drive, it was a ghost failure or temporary glitch; no further action is required.

2. 2

   Identify permanent failure

   If the error reappears in a short time, the ECU has suffered a permanent internal hardware failure.

3. 3

   Disconnect batteries

   Disconnect the machine's batteries.

4. 4

   Remove defective ECU

   Remove the defective Engine ECU from its mounting bracket.

5. 5

   Install replacement ECU

   Install the replacement Engine ECU.

6. 6

   Program new ECU

   Flash/program the new ECU with the correct machine software and calibration files using the Case IH Electronic Service Tool (EST).