Case IH F-5841-31 - ECU – ECU: SCR Inducement Level 3 DEF Quality

This fault indicates that the emissions system has detected substandard or contaminated Diesel Exhaust Fluid (DEF/AdBlue). Because the Selective Catalytic Reduction (SCR) system cannot properly reduce exhaust emissions with poor-quality fluid, the system has escalated to a Level 3 Inducement (Creep Mode). In this state, the machine experiences a severe engine power loss and speed limitation, forcing the engine to low idle. Emergency re-starts are available to allow 30 seconds of normal operation to move the machine.

• MAGNUM AFS Connect
• 240 Series Axial-Flow Combines
• Farmall 115U
• Farmall 40-50 series CVT

1. 1

   Test the DEF/AdBlue using a DEF refractometer to test the fluid currently in the tank. Standard DEF should be exactly 32.5% urea.

2. 2

   Inspect the DEF tank for visual or olfactory signs of cross-contamination (e.g., diesel fuel, water, dirt, or debris).

3. 3

   Check for preceding warning codes, such as DTC 19799 (SCR Inducement: Warning, triggered by DEF/AdBlue Quality fault) or DTC 19788 (Dosing interruption).

4. 4

   Verify that the wiring harness and connector to the DEF tank header/quality sensor are intact and not damaged, as a faulty sensor can falsely trigger a poor quality reading.

1. 1

   Drain the System

   If the DEF is degraded, diluted, or contaminated, completely drain the DEF tank.

2. 2

   Flush the Tank

   Clean and flush the tank to ensure no contaminated fluid or residue remains.

3. 3

   Replace the Filter

   Remove and replace the DEF pump supply filter, as contaminated fluid often compromises the filter element.

4. 4

   Refill

   Fill the tank with fresh, certified ISO 22241 DEF/AdBlue.

5. 5

   Clear Codes

   Connect the Case IH diagnostic service tool (EST) to the machine and clear the inactive fault codes.

6. 6

   Validation Restart

   Perform the SCR Inducement Validation Restart procedure via the diagnostic tool. This forces the system to re-evaluate the DEF quality, verify the repair, and deactivate the Level 3 Creep Mode.