How to Solve Deutz EMR3 71 / 2791 / EGRCD_SigNpl Error

This guide explains how to diagnose and repair the Deutz EMR3 engine error 71 / 2791 / EGRCD_SigNpl, which relates to the EGR actuator circuit.

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Error Description

System: Deutz EMR3
Component: External EGR Actuator

Fault Summary:
The ECU detects no load or an excessive temperature condition in the internal ECU power supply circuit for connected components. This indicates a potential issue with the EGR actuator, wiring, or ECU driver circuit.

Error Details

• Deutz Error Code: 71
• Blink Code (short–long–short): 4 – 1 – 5
• SPN: 2791

Possible FMI Values:

• 5: Current too low or broken wire
• 2: Data stream defective

Error Detection

• Error Lamp: Permanently illuminated
• Error Memory: Fault stored in ECU memory

Possible Causes

• Open circuit or short in EGR actuator wiring
• Overheating or internal fault in ECU
• Defective EGR actuator or position sensor
• Damaged or corroded connectors
• Power or ground supply issue

Repair Actions

1. Visual Inspection
   • Inspect the wiring harness between the EGR actuator and ECU.
   • Look for broken wires, melted insulation, or corroded terminals.
2. Check Connections
   • Ensure all connectors are properly seated and free of dirt, moisture, or corrosion.
   • Clean and reconnect if necessary.
3. Test the EGR Actuator
   • Use a multimeter to measure actuator resistance and verify against specifications.
   • Replace the actuator if it fails the test.
4. Check Power Supply and Ground
   • Verify the voltage supply and ground continuity at the EGR connector.
   • Repair any open or high-resistance connections.
5. Inspect the ECU
   • If wiring and actuator are normal, check for signs of overheating or damage in the ECU.
   • Replace or reprogram the ECU if needed.
6. Clear Fault Codes
   • After completing repairs, clear the error memory using Deutz SerDia or equivalent diagnostic software.
   • Start the engine and confirm the fault no longer appears.

Additional Information

• System Reaction: Warning indicator, shutoff of actuator output, and possible power reduction.
• Error Lamp Behavior: Permanently ON.
• Self-Healing: Not automatic; manual repair and code clearing required.
• Signal Priority: Level 3 (medium severity).
• Condition at Error Detection: Output shut off by ECU.

For more topics about Deutz repair case,please refer to:Deutz Trouble Repair.