What is XCMG XE490D (Cummins CM2250) Fault Code 2345?

Fault Code 2345 indicates an Injector Cylinder 5 – Data Valid But Below Normal Operating Range (Below Normal). This diagnostic trouble code (DTC) is generated by the Engine Control Module (ECM) when it detects that the fuel injector on cylinder 5 is drawing less current than the specified minimum threshold during operation.

In the Cummins CM2250 engine powering the XCMG XE490D excavator, this code specifically relates to the electronic unit injector (EUI) circuit for the fifth cylinder. The ECM continuously monitors injector performance by measuring electrical response during fuel delivery events. When current draw falls below the acceptable range, it signals potential injector coil degradation, wiring issues, or poor electrical connections. This is critical because improper fuel delivery causes power loss, rough operation, increased emissions, and potential damage to other engine components through incomplete combustion.

Common Symptoms

• Check Engine Light (CEL) illuminated on the instrument panel with possible amber warning indicator
• Noticeable power loss or hesitation during digging cycles and boom/bucket operations
• Rough idle with increased engine vibration, particularly noticeable in the cab
• Black or gray exhaust smoke indicating incomplete combustion from cylinder 5
• Engine derate mode activation in severe cases, limiting machine RPM and hydraulic performance

Potential Causes

The most common technical causes for Code 2345 on used XCMG excavators with CM2250 engines include:

• Failed or degraded injector solenoid coil on cylinder 5 (resistance outside specification, typically 0.3-1.2 ohms)
• Damaged injector harness due to vibration, heat exposure near the exhaust manifold, or rubbing against engine components
• Corroded or loose electrical connectors at the injector or ECM interface, common in machines with high operating hours
• Faulty ECM injector driver circuit (less common but possible in high-hour machines)
• Poor ground connections on the engine block or ECM mounting points
• Contaminated engine oil affecting injector mechanical operation and electrical resistance

How to Troubleshoot and Fix Code 2345

Step 1: Visual Inspection Begin by inspecting the injector wiring harness for cylinder 5. On used excavators, check for wire chafing where the harness passes near the valve cover and turbocharger. Inspect all connector pins for corrosion, bent terminals, or oil contamination. Clean connections with electrical contact cleaner and apply dielectric grease.

Step 2: Electrical Testing Using a digital multimeter (DMM), measure the resistance of the cylinder 5 injector solenoid (disconnect harness first). Specification should be approximately 0.6-0.8 ohms at room temperature. Also check harness continuity from the ECM connector to the injector connector and verify ground integrity (should be less than 1 ohm resistance to battery negative).

Step 3: Advanced Diagnostics Connect Cummins INSITE diagnostic software or compatible diagnostic tool to view live injector response data. Monitor actual current draw versus commanded values during cranking. If electrical tests pass but the code persists, the injector may have internal mechanical wear requiring replacement. For used machines, always inspect engine oil quality and check for metal contamination indicating injector failure.

Step 4: Component Replacement If diagnostics confirm injector failure, replace the cylinder 5 fuel injector with a genuine Cummins or OEM-equivalent part. After replacement, perform an injector trim code programming procedure using INSITE to ensure proper fuel delivery calibration.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official XCMG service manual and Cummins engine documentation for your specific machine serial number. Complex electrical diagnostics and injector replacement should be performed by qualified diesel technicians with proper training and calibrated tools.