Case IH 3667 – Engine Control Unit (ECU): EGR Valve Circuit - Open Load Error For Power Stage

The Engine Control Unit (ECU) has detected an open circuit or a lack of electrical load in the power stage (H-bridge) that drives the Exhaust Gas Recirculation (EGR) valve actuator.

• Farmall
• skid steer
• Skid Steer Loaders
• Compact Track Loaders
• SR175
• SR220
• SV250
• TR320
• Steiger
• Maxxum
• Puma
• Backhoe Loaders
• 580N
• 590SN

1. 1

   Inspect the wiring harness between the Engine ECU and the EGR valve for breaks, chafing, or disconnected wires that would cause an open load

2. 2

   Check the EGR valve connector and the 60-pin Engine ECU connector (specifically pins A50 and A35) for corrosion, backed-out pins, or moisture

3. 3

   Look for accompanying H-bridge or EGR codes (such as 3668, 3669, or 3671) to isolate if the issue is a wiring short that burned out the circuit or a true open circuit

1. 1

   Repair Wiring

   If an open circuit is found in the wiring harness or connectors during the diagnostic checks, repair the damaged wire or replace the connector terminal.

2. 2

   Replace Component

   If the wiring tests good, the open load is likely internal to the EGR valve actuator or the Engine Controller itself.

3. 3

   Restore Self-Learning Parameters

   Connect the Case IH Electronic Service Tool (EST) laptop to the machine and run the EGR self-learning/calibration routine so the ECU can relearn the valve's end-stops.

4. 4

   Replace Engine Controller

   If the fault persists after repairs and parameter resets, replace the Engine Controller and use the service tool to restore self-learning parameters.