What is XCMG General Fault Code E1063?

Fault Code E1063 indicates a Hydraulic Pump Pressure Sensor Circuit Malfunction or abnormal signal reading in XCMG excavators. This diagnostic trouble code (DTC) triggers when the Electronic Control Module (ECM) detects voltage readings outside the normal operating range from the main hydraulic pump pressure sensor, typically between 0.5-4.5 volts.

This code directly affects the machine's ability to regulate hydraulic system performance. The pressure sensor provides critical real-time data that allows the ECM to adjust pump output, control implement speed, and protect the hydraulic system from over-pressure conditions. When E1063 is active, the excavator may enter a derate mode to prevent potential damage to hydraulic components, significantly impacting productivity on job sites.

Common Symptoms

When Code E1063 is present, operators typically experience:

• Dashboard warning light illuminated (usually amber hydraulic system icon)
• Noticeably reduced hydraulic power across all functions (boom, arm, bucket, swing)
• Sluggish or inconsistent implement response, especially under load
• Intermittent loss of auxiliary hydraulic functions
• Engine management system may limit RPM to protect hydraulic components

Potential Causes

The most common technical reasons for E1063 in used XCMG excavators include:

• Pressure sensor failure due to internal diaphragm wear or contamination exposure
• Damaged or corroded wiring harness at connector points near the hydraulic pump (common rub point along frame rails)
• Loose or oil-contaminated electrical connectors at the sensor or ECM
• ECM internal fault or corrupted calibration data (less common)
• Hydraulic fluid contamination causing sensor membrane fouling
• Voltage supply issues from damaged power or ground circuits

How to Troubleshoot and Fix Code E1063

Step 1: Visual Inspection Begin by inspecting the hydraulic pump pressure sensor location (typically mounted on the main pump body). Check for physical damage, oil leaks around the sensor, or corroded connector pins. On used excavators, carefully examine the wiring harness from sensor to ECM for abrasion points, especially where it routes near moving components or frame edges.

Step 2: Electrical Testing Using a digital multimeter, perform voltage checks with the ignition on, engine off. Verify the sensor receives proper 5-volt reference supply and has a solid ground connection (less than 0.2 ohms resistance). Check signal wire voltage—it should read between 0.5-4.5 volts depending on system pressure. Inspect connector terminals for corrosion or "spread pins" that prevent solid contact.

Step 3: Sensor Function Test With XCMG diagnostic software or compatible scan tool, monitor live sensor data while operating hydraulics. The pressure reading should correlate with implement movement. Erratic readings or frozen values indicate sensor failure. Before replacing components on used machines, clean all connector contacts with electrical contact cleaner and apply dielectric grease—many E1063 codes resolve through connector maintenance alone.

Step 4: Component Replacement If testing confirms sensor failure, replace with genuine XCMG pressure sensor and clear codes. Verify hydraulic fluid cleanliness meets ISO 4406 standards to prevent repeat failures.

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Disclaimer: This guide provides general troubleshooting information. Always consult XCMG service manuals and qualified diesel technicians for your specific machine serial number. Improper diagnostics may cause additional system damage.