Case IH 19788 (DTC F59F) - ECU – Engine Control Unit (ECU): SCR Inducement triggered by a DEF/AdBlue dosing interruption fault

The Selective Catalytic Reduction (SCR) system has detected a complete interruption in the delivery of Diesel Exhaust Fluid (DEF/AdBlue). Because the emissions system cannot function without DEF, the machine's computer forces a severe power derate (creep mode) to compel the operator to fix the issue.

• MAXXUM T4E
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Farmall series (40, 45, 50, 90C, 95A, 115U)
• Maxxum series (110, 115, 125)
• Puma series
• Luxxum/Vestrum models

1. 1

   Check DEF/AdBlue tank level to ensure it is not empty and inspect fluid quality for contamination (dirt, debris, or water).

2. 2

   Visually inspect all DEF lines from the tank to the dosing pump, and from the pump to the injector, for physical damage, leaks, or severe crystallization.

3. 3

   Remove the DEF injector from the exhaust stream and check for crystallization buildup around the nozzle restricting the spray.

4. 4

   Inspect the wiring harnesses and connectors going to the DEF dosing pump and the DEF injector for chafing, corrosion, or disconnected pins.

1. 1

   Resolve the Root Cause

   Based on the diagnostics, replace the clogged DEF injector, the failed DEF dosing pump, or the damaged DEF lines.

2. 2

   Clean the Mounting Boss

   If replacing the DEF injector, thoroughly clean the mounting boss on the exhaust pipe to ensure a proper seal and prevent exhaust leaks.

3. 3

   Install New Components

   Install the replacement parts and torque all fittings to OEM specifications. Reconnect the electrical harnesses.

4. 4

   Clear Codes and Reset Inducement

   Use a certified Case IH diagnostic tool (such as EST) to clear the inactive fault codes.

5. 5

   System Test

   Run a forced SCR system test or a stationary regeneration to prime the DEF lines, verify that the dosing system is functioning correctly, and reset the ECU's inducement timer.