What is XCMG General Fault Code E1064?

Fault Code E1064 indicates a malfunction in the diesel particulate filter (DPF) differential pressure sensor circuit or an abnormal pressure reading in the exhaust aftertreatment system. This code is triggered when the Engine Control Module (ECM) detects that the differential pressure sensor monitoring the DPF is providing values outside the acceptable range, or the circuit itself has failed.

In XCMG excavators, the DPF system is critical for emissions compliance and optimal engine performance. The differential pressure sensor measures the pressure difference before and after the DPF to determine soot loading levels. When E1064 appears, the ECM cannot accurately monitor DPF status, potentially leading to incomplete regeneration cycles, increased fuel consumption, and eventual engine derate to prevent component damage.

Common Symptoms

• Yellow or amber warning light illuminated on the instrument cluster, often accompanied by a DPF-related message
• Reduced engine power or derate mode activation, limiting machine productivity
• Failed or incomplete DPF regeneration cycles, causing the system to attempt regeneration more frequently
• Increased exhaust smoke or abnormal exhaust temperatures during operation
• Error messages on the display screen specifically referencing exhaust system or sensor faults

Potential Causes

The most common technical causes for E1064 in used XCMG excavators include:

• Damaged or corroded differential pressure sensor due to exposure to high exhaust temperatures and vibration over time
• Clogged or kinked pressure sensing tubes connecting the sensor to the DPF inlet and outlet ports
• Wiring harness damage at known rub points near the turbocharger or along the exhaust system where heat and vibration cause insulation breakdown
• Faulty electrical connections at the sensor connector, often corroded from moisture infiltration in older machines
• ECM communication issues or software calibration errors affecting sensor signal interpretation
• Excessive soot buildup in the DPF causing actual pressure readings that exceed normal parameters

How to Troubleshoot and Fix Code E1064

Step 1: Visual Inspection Begin with a thorough inspection of the differential pressure sensor located on or near the DPF assembly. Check the pressure sensing tubes for cracks, kinks, blockages, or carbon buildup. On used excavators, these rubber or silicone tubes often deteriorate from heat exposure. Inspect the wiring harness from the sensor back to the ECM, paying special attention to areas where the harness passes near hot exhaust components or sharp edges.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor and check the supply voltage at the harness connector (typically 5V reference voltage). Verify ground continuity and measure sensor resistance according to XCMG specifications (usually between 1-5 kΩ depending on sensor type). Check for short circuits or open circuits in the wiring. For used machines, corrosion inside connector pins is common—clean with electrical contact cleaner and dielectric grease.

Step 3: Sensor and System Testing If wiring checks pass, test the differential pressure sensor itself using XCMG diagnostic software or a compatible scan tool. Monitor live data to see if the sensor responds to pressure changes. Compare readings against manufacturer specifications. If the sensor is faulty, replacement is necessary. Before installing a new sensor, clear the pressure sensing ports on the DPF with compressed air and verify the DPF isn't excessively loaded, as this can cause legitimate high-pressure readings triggering E1064.

Step 4: DPF Condition Assessment In used excavators with high hours, the DPF may be genuinely clogged beyond normal regeneration capacity. Perform a forced regeneration using diagnostic software. If the code persists or regeneration fails, the DPF may require professional cleaning or replacement.

Disclaimer: This guide provides general troubleshooting information for E1064 fault codes. Always consult the official XCMG service manual for your specific model and serial number. Complex electrical diagnostics and DPF service should be performed by qualified diesel technicians with proper tools and safety equipment.