What is XCMG XE490D (CM2150C-CM2150D) Fault Code 1145?

Fault Code 1145 indicates a Low Injector Solenoid Response on Cylinder 5. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects that the fuel injector solenoid on cylinder 5 is not responding properly to commanded activation signals, showing slower-than-expected electrical response times or insufficient voltage draw.

In the Cummins CM2150C and CM2150D engines powering the XCMG XE490D excavator, precise injector control is critical for maintaining fuel efficiency, emissions compliance, and smooth power delivery. When the injector solenoid on cylinder 5 fails to respond within the ECM's specified parameters (typically within milliseconds), combustion becomes unbalanced, affecting the entire engine's performance and potentially causing accelerated wear on other cylinders compensating for the deficiency.

Common Symptoms

• Check Engine Light illuminated on the instrument panel with possible derate mode activation
• Rough idling or misfiring, particularly noticeable during cold starts or low-load operation
• Visible white or black smoke from the exhaust due to incomplete combustion in cylinder 5
• Reduced hydraulic power and slower cycle times as the ECM limits engine output to protect components
• Increased fuel consumption as the ECM attempts to compensate for the underperforming cylinder

Potential Causes

The most common technical causes for Code 1145 on used XCMG excavators include:

• Worn or failed injector solenoid on cylinder 5 due to extended operating hours (common after 8,000+ hours)
• Corroded or loose wiring connections at the injector harness connector, especially where the harness contacts the valve cover
• Damaged injector harness caused by rubbing against the valve cover or rocker housing—a known wear point on CM2150 engines
• Low battery voltage or poor grounding affecting the ECM's ability to properly energize the injector solenoid
• Internal ECM driver circuit failure specific to the cylinder 5 injector control circuit
• Contaminated fuel causing varnish buildup on the solenoid plunger, restricting movement

How to Troubleshoot and Fix Code 1145

Step 1: Visual Inspection Begin by inspecting the injector wiring harness on cylinder 5. On used excavators, check for harness chafing where it passes near the valve cover edge and rocker arms. Look for oil contamination in the connector, corrosion on pins, or damaged wire insulation. Clean all connections with electrical contact cleaner and ensure proper seating.

Step 2: Electrical Testing Using a digital multimeter, perform a resistance check on the cylinder 5 injector solenoid. Disconnect the harness and measure across the injector terminals—resistance should typically read between 0.3-0.6 ohms at room temperature. Compare this reading with adjacent cylinders. Also check for shorts to ground (reading should be infinite resistance/open circuit).

Step 3: Voltage Supply Verification With the harness connected and ignition on (engine off), use a multimeter to verify the ECM is supplying proper voltage to the injector (typically 90-105V DC during cranking). If voltage is present but the injector doesn't respond, the injector solenoid itself has likely failed and requires replacement.

Step 4: Harness and Connector Assessment For used machines, pay special attention to the injector harness connector. Remove it completely and inspect for bent pins, corrosion, or moisture intrusion. Apply dielectric grease before reconnection. If the harness shows wear at common rub points, consider rerouting or replacing the entire harness to prevent recurring issues.

Step 5: Component Replacement and Verification If diagnostics point to injector failure, replace the cylinder 5 fuel injector assembly. After installation, use Cummins Insite or compatible diagnostic software to clear codes, perform an injector cutout test to verify proper operation, and monitor real-time injector response data during a test run.

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Disclaimer: This guide provides general troubleshooting information for educational purposes. Fuel system repairs on high-pressure common rail engines require specialized training and tools. Always consult the manufacturer's service manual and consider professional diagnostic assistance, especially when working with used equipment that may have undocumented modifications or wear patterns.