XCMG XE15 Mini Excavator Fault Code 241: Meaning, Symptoms & Fix

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What is XCMG XE15 Fault Code 241?

XCMG XE15 Fault Code 241 indicates a fault in the engine throttle control signal circuit, specifically related to an abnormal voltage signal received by the Engine Control Module (ECM) from the throttle potentiometer or throttle control unit.

On the XCMG XE15 mini excavator, the throttle control system governs engine RPM output based on operator input. The ECM continuously monitors the voltage signal from the throttle sensor to regulate fuel delivery and engine speed. When the signal falls outside the expected operating range — typically due to an open circuit, short circuit, or a failed potentiometer — the ECM logs Code 241 and may trigger a protective response.

This fault is critical because uncontrolled or erratic engine speed directly impacts hydraulic system performance, fuel efficiency, and overall machine controllability. On used units, this code is particularly common due to normal wear on the throttle dial assembly and aging wiring harnesses.

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Common Symptoms

When Fault Code 241 is active on the XCMG XE15, operators typically experience one or more of the following:

• Engine RPM becomes fixed or unresponsive — the throttle dial no longer adjusts engine speed normally
• Warning indicator illuminates on the instrument cluster or monitor panel
• Engine defaults to idle or low RPM mode as a protective derate strategy
• Sluggish or reduced hydraulic performance, particularly during digging or lifting operations
• Intermittent engine speed fluctuation even without operator input to the throttle control

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Potential Causes

The following are the most likely root causes of Fault Code 241 on the XCMG XE15:

• Worn or failed throttle potentiometer — the internal resistive element degrades over time, especially on high-hour used machines
• Damaged or corroded wiring harness — the signal wire between the throttle assembly and the ECM is prone to chafing near the cab frame and firewall penetration points
• Loose or oxidized connector pins at the throttle sensor plug or ECM connector
• Open circuit or short to ground in the throttle signal wire (Pin signal voltage out of the 0.5V–4.5V normal operating range)
• Failed ECM — less common, but possible on older units with moisture intrusion history

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How to Troubleshoot and Fix Fault Code 241

Follow this step-by-step diagnostic procedure before replacing any components.

Step 1 — Inspect the Throttle Dial Assembly Visually inspect the throttle control knob and its mounting. On used excavators, check for physical damage, excessive play, or signs of moisture ingress. Rotate the dial through its full range and observe if the fault is intermittent, which indicates a worn potentiometer.

Step 2 — Check the Wiring Harness and Connectors Trace the harness from the throttle assembly back to the ECM. Pay close attention to known rub points near the cab frame, door hinges, and any cable ties that may have caused insulation wear. Disconnect the connector and inspect all pins for corrosion, bent terminals, or pushed-back pins. On used machines, green oxidation on pins is a frequent culprit.

Step 3 — Perform Voltage and Resistance Testing Using a digital multimeter, check the following with the key in the ON position:

• Supply voltage at the throttle sensor connector: should read approximately 5V DC
• Signal voltage across the operating range: should sweep smoothly from approximately 0.5V to 4.5V as the dial is rotated
• Resistance of the potentiometer across its range: should change linearly without dead spots or open readings

If voltage is absent or erratic, isolate whether the fault is in the harness or the sensor itself by back-probing at the ECM connector.

Step 4 — Use Diagnostic Software Connect XCMG's proprietary diagnostic tool or a compatible third-party construction equipment scanner to read live ECM data. Monitor the throttle position percentage in real time. A reading that is frozen, jumping erratically, or reading 0% or 100% at rest confirms a sensor or circuit fault.

Step 5 — Replace and Verify Replace the throttle potentiometer if testing confirms a failed sensor. Clear the fault code using the diagnostic tool and cycle the ignition. Perform a full throttle sweep test to verify the fault does not return before returning the machine to service.

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Professional Disclaimer: The diagnostic information provided in this guide is intended for reference purposes for qualified heavy diesel mechanics and experienced equipment operators. Fault code definitions and repair procedures may vary depending on machine serial number, production year, and regional ECM calibration. Always consult the official XCMG service manual and wiring diagrams specific to your unit before undertaking repairs. For complex electrical faults or ECM-related issues, engagement of a certified XCMG service technician is strongly recommended.