Case IH 3574 – Engine Control Unit (ECU) / Dosing Control Unit (DCU): Info: SCR Inducement: Warning Block 3 activated

Informational fault code indicating that the Selective Catalytic Reduction (SCR) system has entered a Level 3 inducement (which typically results in a severe engine derate or impending engine shutdown). It is triggered by another active Dosing interrupt group fault, such as an empty DEF tank, poor urea quality, or a dosing system malfunction.

• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum Rowtrac
• Farmall 115U
• Farmall 120A

1. 1

   Connect the Electronic Service Tool (EST) to the CAN network and check for other active primary faults (e.g., NOx sensor plausibility, DEF level, or urea quality codes).

2. 2

   Inspect all wiring and connectors to the ECU and DCU to ensure they are properly connected, undamaged, and connector locks are secure.

3. 3

   Perform a harness flex test on the harnesses involved with the SCR and DCU systems to reveal any intermittent breaks or shorts.

1. 1

   Identify the Root Cause

   Using the EST, identify the primary Dosing interrupt fault code that triggered the Warning Block 3 inducement.

2. 2

   Perform Primary Repair

   Repair the underlying issue. Depending on the primary code, this usually involves draining contaminated or degraded DEF and refilling the tank with fresh, high-quality urea, repairing damaged wiring or replacing broken connector locks at the DCU or ECU, or replacing a faulty NOx sensor or DEF dosing module.

3. 3

   Verify Connections

   Ensure all ECU and DCU connectors are fully seated and locked.

4. 4

   Clear Codes and Heal the System

   Once the primary Dosing interrupt fault is repaired and healed, the SCR inducement Warning fault (3574) will automatically clear/deactivate.

5. 5

   Test Run

   Run the machine to verify that the Warning Block 3 inducement has been lifted and normal engine performance is restored.