XCMG Excavator Fault Code E1160: Complete Diagnostic Guide

What is XCMG Fault Code E1160?

Fault Code E1160 indicates a Hydraulic Pump Pressure Sensor Circuit Malfunction or abnormal signal voltage detected by the Electronic Control Module (ECM). This code specifically relates to the main hydraulic pump pressure monitoring system, which is critical for load-sensing hydraulic control in XCMG excavators.

The hydraulic pump pressure sensor continuously monitors system pressure and sends voltage signals to the ECM to optimize pump output and prevent over-pressurization. When the ECM detects a signal voltage outside the normal operating range (typically 0.5-4.5 volts), it registers E1160 and may initiate protective measures. This fault is particularly critical because the hydraulic system is the lifeblood of excavator operation, affecting boom, arm, bucket, and swing functions. Ignoring this code can lead to reduced machine performance, inefficient fuel consumption, or catastrophic hydraulic pump failure.

Common Symptoms

• Hydraulic system warning light illuminated on the instrument cluster with possible audible alarm
• Reduced hydraulic power or sluggish movement of boom, arm, or bucket cylinders
• Erratic operation where hydraulic functions work intermittently or respond inconsistently to joystick inputs
• Engine derating or automatic power reduction to protect the hydraulic system from damage
• Abnormal hydraulic noise such as cavitation or whining from the main pump during operation

Potential Causes

The most common technical causes for E1160 in used XCMG excavators include:

• Faulty hydraulic pressure sensor due to internal component degradation or diaphragm failure (common after 5,000+ operating hours)
• Damaged or corroded wiring harness connecting the sensor to the ECM, especially at known rub points near the pump mounting area
• Connector corrosion or moisture intrusion at the sensor plug, particularly on machines operating in wet or humid environments
• Poor electrical ground connection at the sensor mounting point or ECM grounding strap
• ECM internal fault (less common) affecting the analog-to-digital converter circuit for pressure signal processing
• Actual hydraulic system pressure anomalies caused by worn pump components, relief valve issues, or contaminated hydraulic fluid

How to Troubleshoot and Fix Code E1160

Step 1: Visual Inspection and Connector Check Begin by locating the hydraulic pump pressure sensor (typically mounted on the main hydraulic pump housing). Inspect the wiring harness for visible damage, abrasion, or oil contamination along its entire length to the ECM. On used excavators, pay special attention to areas where the harness passes near moving components or sharp edges. Disconnect the sensor connector and inspect for corrosion, bent pins, or moisture. Clean with electrical contact cleaner if necessary.

Step 2: Electrical Testing with Multimeter With the ignition OFF, disconnect the pressure sensor. Using a digital multimeter, measure the sensor's internal resistance between the signal pin and ground pin (consult XCMG service manual for specific values, typically 200-5000 ohms). Next, check for continuity in the wiring harness from the sensor connector to the ECM connector. Measure for short circuits to ground or power on the signal wire. With ignition ON (engine OFF), check for 5-volt reference voltage from the ECM at the sensor connector.

Step 3: Sensor Signal Testing and Replacement If wiring tests pass, reconnect the sensor and use XCMG diagnostic software (or compatible OBD reader) to monitor live sensor voltage while the engine is running. Normal pressure sensor output should range from approximately 0.5V at idle to 3.5-4.0V under load. Erratic readings, stuck values, or out-of-range voltages indicate sensor failure. For used machines, always verify actual hydraulic system pressure using a mechanical pressure gauge before condemning the sensor—worn pumps can cause genuine pressure issues that trigger this code.

Step 4: Ground and ECM Verification Verify the sensor mounting location provides a clean ground connection (remove sensor, clean mounting surface, apply dielectric grease on reinstallation). Check the ECM main ground strap for tightness and corrosion. If all tests pass but the code persists, ECM internal fault is possible—consult an authorized XCMG technician for ECM diagnostics.

---

Disclaimer: This guide provides general diagnostic information for experienced heavy equipment mechanics. Always consult the official XCMG service manual for your specific model and serial number. If you lack proper diagnostic tools or experience with hydraulic systems, seek professional assistance to avoid injury or further equipment damage.