Case IH F-519645-00 - ECU – ECU: SCR Inducement EGR Valve Blocked

The Engine Control Unit (ECU) has detected that the Exhaust Gas Recirculation (EGR) valve is stuck, blocked by carbon buildup, or failing to flow the expected amount of exhaust gas. Because the EGR system is critical for reducing emissions, its failure triggers an SCR Inducement. This is a forced engine derate designed to protect the engine and force the operator to address the emissions failure.

• MAGNUM AFS Connect
• Farmall 105C
• Farmall 115C
• Farmall 120C
• Maxxum
• Puma
• Steiger
• Magnum

1. 1

   Check for secondary codes related to air filter clogging, boost pressure, or DPF/SCR sensors, which might indicate a broader intake/exhaust restriction.

2. 2

   Inspect the wiring harness and the electrical connector at the EGR valve for corrosion, damaged pins, or short circuits.

3. 3

   Using the Case IH Electronic Service Tool (EST) or an FPT diagnostic instrument, command the EGR valve to open and close to monitor position sensor feedback.

4. 4

   Remove the EGR valve and visually inspect the intake manifold passages and the valve itself for heavy carbon/soot buildup.

1. 1

   Disconnect power

   Disconnect the machine's battery to prevent electrical shorts and ensure safety.

2. 2

   Clear access

   Depending on the specific tractor model, temporarily remove or support surrounding components (such as the starter motor) to gain clear access to the EGR unit.

3. 3

   Disconnect wiring

   Unplug the electrical connector from the EGR valve housing.

4. 4

   Remove piping

   Loosen the retaining clip/clamp and detach the exhaust gas pipe from the EGR valve housing.

5. 5

   Unbolt the valve

   Unscrew the EGR fastening screws on the front side of the valve, followed by the screws on the valve support side.

6. 6

   Remove and clean

   Remove the EGR unit. Thoroughly clean the mating surfaces on the engine and ensure the intake/exhaust passages are free of loose carbon.

7. 7

   Install new valve

   Install the new EGR valve using a new gasket. Do not use liquid gasket sealer.

8. 8

   Reassembly

   Tighten the fastening screws to OEM torque specs, reattach the exhaust pipe and clip, and plug the electrical connector back in.

9. 9

   Reset the ECU

   Reconnect the battery. You must use a diagnostic tool to clear the historical fault codes and reset the SCR Inducement state; otherwise, the tractor may remain in derate/creep mode.