What is Sany SY245H Fault Code 16 (E116)?

Fault Code 16 (E116) on the Sany SY245H excavator indicates a malfunction in the travel motor speed sensor circuit or an abnormal signal from the travel motor control system. This code specifically relates to the hydraulic travel system's electronic feedback mechanism, which monitors the rotation speed and proper operation of the travel motors.

The travel motor speed sensor provides critical data to the Electronic Control Unit (ECU) about track drive performance, allowing the system to regulate hydraulic flow and optimize machine movement. When Code E116 triggers, it signals that the ECU is receiving either no signal, an erratic signal, or a signal outside the normal voltage range from one or both travel motor sensors. This fault is particularly important on the SY245H because it directly impacts the machine's ability to maintain consistent travel speed and can engage safety protocols that limit performance to prevent drivetrain damage.

Common Symptoms

When Code 16 (E116) is active on your Sany SY245H, you may experience:

• Warning light illumination on the instrument cluster, often accompanied by an audible alarm
• Reduced travel speed or inability to achieve full track drive power (derate mode activation)
• Erratic or jerky movement when attempting to travel forward or backward
• One-sided travel issues where one track responds normally while the other performs poorly
• Complete travel function shutdown in severe cases, though hydraulic functions (boom, stick, bucket) may continue operating normally

Potential Causes

The most common technical failures triggering Code E116 on used Sany SY245H excavators include:

• Failed travel motor speed sensor due to internal component degradation, seal failure, or magnetic pickup wear
• Damaged or corroded wiring harness between the sensor and ECU, particularly at connection points near the travel motor where cable flexing occurs during slewing operations
• Loose or corroded electrical connectors at the sensor or ECU terminals, commonly caused by water intrusion or vibration
• ECU internal faults or corrupted software calibration affecting signal interpretation
• Physical damage to sensor mounting or air gap issues between the sensor and target wheel on older machines
• Voltage supply problems from the machine's electrical system delivering inconsistent power to the sensor circuit

How to Troubleshoot and Fix Code 16 (E116)

Step 1: Visual Inspection and Connector Check

Begin by locating the travel motor speed sensors on both travel motors (typically mounted on the motor housing). Inspect the wiring harness from each sensor back to the main wiring bundle, looking specifically for abrasion points where cables contact the swing bearing, undercarriage components, or hydraulic lines. On used excavators, these rub points are common failure locations. Disconnect the sensor connectors and examine terminals for corrosion, bent pins, or moisture. Clean with electrical contact cleaner and apply dielectric grease before reconnection.

Step 2: Electrical Testing with Multimeter

Using a digital multimeter, check the sensor power supply voltage at the sensor connector (engine running). Sany systems typically provide 8-12V DC to these sensors. Verify continuity of all wires between the sensor and ECU connector. Check sensor resistance according to Sany specifications (typically 500-1500 ohms for magnetic pickup sensors, though consult your service manual). If resistance reads open circuit or zero ohms, the sensor has failed internally.

Step 3: Sensor Air Gap and Signal Testing

Inspect the physical gap between the sensor tip and the target wheel on the travel motor shaft—this should typically be 0.5-2.0mm. Use a feeler gauge to verify clearance. If you have access to Sany PC software (PC360 or SY Excavator Diagnostic Tool), connect to monitor real-time sensor signal output while manually rotating the track. The signal should show consistent AC voltage pulses. Absence of signal with proper power supply confirms sensor failure.

Step 4: Component Replacement and Verification

If diagnostics confirm sensor failure, replace with genuine Sany parts or verified OEM-equivalent sensors designed for the SY245H. For used excavators, simultaneously replace the sensor connector pigtail if showing any wear. After installation, clear fault codes using diagnostic software, operate the machine through full travel cycles in both directions, and verify Code E116 does not return. Check for proper sensor voltage output during operation.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Sany SY245H service manual for model-specific procedures, torque specifications, and safety protocols. If you lack proper diagnostic tools or experience with hydraulic excavator electrical systems, consult a certified Sany dealer or qualified heavy equipment technician to prevent injury or further machine damage.