What is XCMG XE490D (CM2150C-CM2150D) Fault Code 269?

Fault Code 269 indicates Engine Cylinder #2 Injector Circuit - Current Below Normal or Shorted to Low Source. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects abnormally low electrical current flowing through the fuel injector circuit for cylinder #2, or when the circuit is shorted to ground.

In the Cummins CM2150 series engines powering XCMG excavators, precise injector current control is critical for proper fuel atomization, combustion efficiency, and emissions compliance. When this code activates, the ECM cannot properly command the #2 injector, leading to incomplete combustion, power loss, and potential engine damage if left unaddressed. For used excavators, this code often points to wiring harness deterioration or connector corrosion—common issues in machines with extensive operating hours.

Common Symptoms

• Check Engine Light (CEL) illuminated on the instrument cluster, often accompanied by a specific injector fault warning
• Noticeable rough idle or engine misfire, particularly when cold-starting the machine
• Reduced engine power and potential derate mode activation, limiting excavator performance during high-load operations
• Increased black or white smoke from the exhaust due to improper fuel delivery in cylinder #2
• Poor fuel economy and difficulty maintaining consistent RPM under load

Potential Causes

• Damaged or corroded injector wiring harness at common rub points near the valve cover or cylinder head (extremely common in used equipment)
• Faulty cylinder #2 fuel injector solenoid with internal short circuit or coil failure
• Corroded or loose electrical connectors at the injector plug or ECM connection points
• Chafed wiring caused by improper harness routing after previous repairs or engine work
• ECM internal driver circuit failure (less common but possible in high-hour machines)
• Water intrusion into injector connectors from damaged valve cover gaskets or weather seals

How to Troubleshoot and Fix Code 269

Step 1: Visual Inspection Perform a thorough inspection of the injector wiring harness from the ECM to cylinder #2 injector. Look specifically for abraded insulation, melted wires, or green corrosion at connector pins. On used excavators, check harness routing near engine mounts and vibration points where wear commonly occurs.

Step 2: Electrical Testing Using a digital multimeter (DMM), measure resistance across the #2 injector connector (injector disconnected). Typical resistance should be 0.3-0.9 ohms for CM2150 injectors. Also check for continuity to ground—there should be infinite resistance (open circuit). Any reading below 10k ohms indicates a short to ground.

Step 3: Swap Test Swap the #2 injector connector with cylinder #1 or #3. Clear codes and operate the engine. If the fault code moves to the new cylinder location, the injector solenoid is faulty and requires replacement. If Code 269 remains on cylinder #2, the issue is in the wiring harness or ECM.

Step 4: Harness and Connector Repair Inspect the ECM connector pins and injector harness intermediate connectors for pushed-back pins, corrosion, or moisture. Clean with electrical contact cleaner and apply dielectric grease. Replace any damaged sections of harness—avoid simple electrical tape repairs on used machines as they fail quickly.

Step 5: Advanced Diagnostics Use Cummins INSITE or XCMG-compatible diagnostic software to monitor real-time injector current draw. Compare cylinder #2 readings against other cylinders during cranking and idle. Significant deviation confirms component failure versus intermittent wiring issues.

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Disclaimer: This guide provides general diagnostic information for experienced technicians. Always consult the official XCMG service manual and Cummins troubleshooting procedures for your specific engine serial number. If unfamiliar with high-pressure fuel systems or electrical diagnostics, seek assistance from a certified Cummins or XCMG service center to avoid injury or equipment damage.