Case IH 3436 (DTC FBBF) - ECU – Engine Control Unit (ECU): Inducement system is locked due to 3 detections in 40 hours.

This is a 'repeat offender' code related to the Selective Catalytic Reduction (SCR) / Diesel Exhaust Fluid (DEF) emissions system. It means that an emissions-related fault of the same class type has occurred more than 3 times within a 40-hour operating window, resulting in an inducement lock condition.

• MAXXUM T4E
• 240 Series Axial-Flow (7240, 8240, 9240)
• 30 Series Axial-Flow (7230, 8230, 9230)
• Puma series
• Farmall series (120A, 40-45-50 CVT)
• Steiger AFS Connect
• NEF engines
• Cursor 9 engines

1. 1

   Use the Electronic Service Tool (EST) to check for the specific active urea/DEF system faults that are causing the inducement

2. 2

   Inspect all wiring and connectors to the ECU and Dosing Control Unit (DCU) for damage, ensuring connector locks are not broken and securely hold the connectors in place

3. 3

   Check the CAN network using the EST and verify there is 60 ohms of resistance between the CAN HI and CAN LO wires

4. 4

   Verify that the tractor battery power supply has not been connected to an external power supply, which can cause erratic ECU behavior

1. 1

   Connect EST

   Connect the Electronic Service Tool (EST) to the machine's diagnostic port.

2. 2

   Navigate to configuration

   Navigate to the configuration menu (configuration icon).

3. 3

   Select unlock screen

   Select the 'Engine Restart Counter Reset / Unlock Inducement' screen.

4. 4

   Configure item

   Click on 'CONFIGURE SELECTED ITEM'.

5. 5

   Reset counter

   Click the button labeled 'RESET ENGINE RESTART COUNTER / UNLOCK INDUCEMENT' to clear the inducement restart counters.

6. 6

   Identify underlying faults

   Once the system is unlocked, use the EST to identify the underlying DEF/AdBlue system faults that originally triggered the lock.

7. 7

   Resolve active faults

   Follow the appropriate service manual procedures to resolve each of those existing active faults (e.g., replacing a faulty NOx sensor or DEF quality sensor).

8. 8

   Perform verification test

   Perform the SCR Fault Repair Verification Test using the EST before returning the machine to service to ensure the root cause is fully resolved.