What is Sany General Fault Code P910?

Fault Code P910 on Sany excavators indicates a communication error or malfunction within the pilot pressure sensor circuit. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects an abnormal voltage signal, open circuit, or short circuit in the pilot pressure sensor system that monitors hydraulic pilot pressure for joystick and control lever inputs.

The pilot pressure sensor is critical for modern Sany excavators because it translates operator control inputs into electronic signals that the ECM uses to regulate hydraulic flow and machine responsiveness. When this sensor circuit fails, the machine cannot accurately interpret operator commands, leading to erratic operation or complete loss of hydraulic function. For used excavators, this code often appears due to age-related wiring degradation or sensor drift from prolonged exposure to vibration and hydraulic fluid contamination.

Common Symptoms

When Code P910 is active, operators typically experience:

• Intermittent or complete loss of hydraulic control through joysticks and control levers
• Warning light illumination on the instrument cluster, often accompanied by audible alarms
• Erratic hydraulic response, where boom, arm, or bucket movements don't match control inputs
• Reduced engine power or derate mode as the ECM enters a protective state
• Machine entering limp mode, limiting operational capabilities until the fault is resolved

Potential Causes

The most common technical reasons for P910 in used Sany excavators include:

• Damaged or corroded wiring harness at connector points near the pilot valve assembly (known wear point)
• Failed pilot pressure sensor due to internal component degradation or contaminated hydraulic fluid exposure
• Loose or oxidized electrical connectors between the sensor and ECM
• Voltage supply issues from damaged power or ground circuits
• ECM software glitches or internal ECM failure (less common)
• Physical damage to sensor mounting from impact or improper maintenance procedures

How to Troubleshoot and Fix Code P910

Step 1: Visual Inspection Begin by inspecting the pilot pressure sensor located near the pilot valve block. Check for physical damage, hydraulic fluid leaks onto the sensor, and corrosion on the electrical connector. On used excavators, pay special attention to harness rub points where cables contact the frame or hydraulic lines.

Step 2: Electrical Testing Using a digital multimeter, measure the sensor's supply voltage (typically 5V reference) and ground circuit with the ignition on. Check connector pins for resistance values according to Sany specifications (usually 0.5-4.5kΩ depending on pressure). Inspect for short circuits to ground or open circuits indicating broken wires.

Step 3: Sensor and Harness Replacement If voltage readings are correct but the sensor shows out-of-range resistance, replace the pilot pressure sensor. For used machines with multiple electrical issues, consider replacing the entire sensor harness from the pilot valve to the ECM, as internal wire breaks are common. Clear the code using Sany diagnostic software and perform a functional test under load.

Step 4: ECM Communication Check If the fault persists after sensor replacement, use factory diagnostic software to verify ECM communication integrity and check for related codes that might indicate a broader electrical system problem.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Sany service manual for your specific model and serial number. If you're unfamiliar with hydraulic or electrical systems, seek assistance from a certified heavy equipment technician to avoid injury or further machine damage.