Case IH 3666 – Engine ECU: EGR Permanent Governor Deviation for Valve

The engine control system is commanding the Exhaust Gas Recirculation (EGR) valve to move to a specific position, but the valve is failing to reach it.

• Farmall
• SR175
• SV series
• Farmall series
• Maxxum series

1. 1

   Remove and inspect the EGR valve for mechanical binding, heavy carbon-fouling, and physical sticking

2. 2

   Check the EGR position sensor for accurate readings, as a mismatched sensor will trigger this code

3. 3

   Test the wiring harness to the EGR valve for intactness and proper voltage, checking for open loads, over-temperature, or short circuits

1. 1

   Access the EGR System

   Locate the EGR valve on the engine exhaust/intake manifold assembly.

2. 2

   Remove the EGR Valve

   Disconnect the electrical harness connector from the EGR valve actuator. Unbolt the valve from the EGR cooler/manifold lines.

3. 3

   Inspect/Clean or Replace

   If the valve is jammed with soot and cannot be safely freed, or if the internal position sensor has failed, the EGR valve must be replaced.

4. 4

   Install the New Valve

   Bolt the new EGR valve into place and reconnect the electrical harness.

5. 5

   Software Reset

   Connect the Electronic Service Tool (EST) and 'Follow The Appropriate Service Tool Procedure To Restore Engine Self Learning Parameters.' You must configure and reset the ECU data for the new EGR valve so the engine learns its new end-stops.