New Holland 3665 – Engine ECU: EGR Valve Position Cannot Be Reached

The Engine ECU has commanded the Exhaust Gas Recirculation (EGR) valve to a specific position, but the valve's internal sensor reports that it has not achieved that position. This permanent governor deviation is most commonly caused by heavy carbon buildup causing the valve to physically stick, or an electrical mismatch with the position sensor.

• L220
• L228
• C332
• C327
• C337
• L321
• L328

1. 1

   Visually inspect the EGR valve, electrical connector, and wiring harness for damage, corrosion, or broken wires.

2. 2

   Check for heavy carbon (soot) buildup inside the EGR valve and connecting pipes that may cause the valve to physically stick.

3. 3

   Inspect the EGR passages in the intake manifold and connecting pipes for restrictions.

4. 4

   Perform an electrical resistance test on the EGR valve solenoid terminals using a multimeter (expected range is typically 4 to 12 ohms).

5. 5

   Verify if the code persists after a diagnostic ECU reset, as some systems require a reset even after cleaning.

1. 1

   Safety First

   Park the machine on a level surface, allow the engine to cool completely, and disconnect the negative battery terminal.

2. 2

   Locate the EGR Valve

   The EGR valve is typically located on or near the engine's intake manifold.

3. 3

   Disconnect Components

   Disconnect the electrical connector from the EGR valve. If the system is coolant-fed, drain some engine coolant before disconnecting the coolant hoses from the valve. Loosen and remove any pipes or tubes connected to the valve.

4. 4

   Remove the Old EGR Valve

   Unbolt the EGR valve from its mounting point on the engine. Apply steady pressure to avoid breaking tight bolts, and pry gently if stuck by old gasket material and carbon buildup.

5. 5

   Thoroughly Clean Mating Surfaces

   Thoroughly clean all carbon deposits and old gasket material from the mounting surface on the intake manifold using a gasket scraper. Also, clean the connecting pipes and passages to ensure unrestricted flow.

6. 6

   Install the New Valve

   Place the new gasket on the cleaned mounting surface. Position the new EGR valve and hand-tighten the mounting bolts. Use a torque wrench to tighten the bolts to the manufacturer's specified torque value in a crisscross pattern.

7. 7

   Reconnect and Refill

   Reconnect the electrical connector, any coolant lines, and exhaust pipes. Refill the coolant system if it was drained. Reconnect the negative battery terminal.

8. 8

   Clear Codes and Relearn

   Use a diagnostic scan tool to clear the fault code from the ECU's memory. Run a relearn or synchronization procedure with a diagnostic tool so the ECU can adapt to the new valve.

9. 9

   Test Operation

   Start the engine and allow it to warm up. Conduct a test run under various load conditions to ensure the fault code does not return and the engine is operating smoothly.