What is Doosan DX380-9C Fault Code E000655-13?

Fault Code E000655-13 on the Doosan DX380-9C excavator indicates a "Swing Motor 1 Solenoid Valve Control Circuit - Open Circuit or Short to Ground" malfunction. This diagnostic trouble code (DTC) is triggered when the Electronic Control Unit (ECU) detects an abnormal electrical condition in the proportional solenoid valve circuit that controls the first swing motor's hydraulic flow.

This code specifically affects the swing control system, which is critical for the excavator's rotational movement. The swing motor solenoid valves regulate hydraulic pressure based on operator joystick input, and any electrical failure in this circuit compromises precise swing control. On the DX380-9C, this system relies on pulse-width modulated (PWM) signals from the main controller, making proper voltage delivery and circuit integrity essential for smooth operation.

Common Symptoms

When fault code E000655-13 is active, operators typically experience:

• Swing function completely inoperative or intermittent loss of swing control during operation
• Warning light illumination on the instrument cluster with fault code display on the monitor
• Jerky or erratic swing motion when attempting rotational movements, especially under load
• Reduced swing speed or inability to modulate swing velocity smoothly
• Audible alarm accompanied by potential entry into derated or safety mode limiting machine performance

Potential Causes

The most common technical causes for E000655-13 on used DX380-9C excavators include:

• Damaged wiring harness between the main ECU and swing motor solenoid valve, particularly at known rub points near the swing bearing raceway
• Corroded or loose electrical connectors at the solenoid valve plug due to moisture ingress or age-related oxidation
• Failed proportional solenoid valve coil with internal open circuit or insulation breakdown
• Chafed wires contacting the chassis, creating intermittent short-to-ground conditions
• ECU internal driver circuit failure (less common but possible on high-hour used machines)
• Blown fuse or relay in the solenoid valve power supply circuit

How to Troubleshoot and Fix Code E000655-13

Step 1: Visual Inspection Begin by disconnecting the battery negative terminal for safety. Inspect the entire wiring harness from the main controller to the swing motor solenoid valve, focusing on areas where the harness passes through the swing circle or near moving components. Look for abraded insulation, pinched wires, or damaged connectors. On used excavators, check for previous repair attempts using inferior wire or tape.

Step 2: Connector and Resistance Testing Disconnect the solenoid valve connector and inspect pins for corrosion, bent contacts, or moisture. Using a digital multimeter (DMM), measure the solenoid coil resistance at the valve side—typical specification is 3-8 ohms (consult service manual for exact values). An open circuit (infinite resistance) indicates coil failure; zero resistance suggests an internal short.

Step 3: Circuit Continuity and Voltage Checks With the connector still separated, check for continuity between each wire in the harness and chassis ground—there should be no continuity (infinite resistance). Next, reconnect only the ECU side and turn the key to ON position (engine off). Measure supply voltage at the harness connector—you should see approximately 12-14V on the power supply wire. If voltage is absent, trace back to check fuses, relays, and ECU output.

Step 4: Advanced Diagnostics Connect Doosan DMS (Diagnostic Master System) software via the diagnostic port to monitor real-time solenoid command signals and actual current draw. Compare commanded versus actual values—discrepancies indicate circuit problems. Perform an actuator test through the software to energize the solenoid while monitoring amperage draw with a clamp meter (typical draw: 1-3 amps).

Step 5: Repair and Verification Replace damaged harness sections using OEM-spec wire with proper gauge and insulation rating. Apply dielectric grease to all connectors before reassembly. If the solenoid valve coil has failed, replacement of the entire valve assembly is typically required. After repairs, clear codes using diagnostic software, cycle the ignition, and perform operational testing of swing functions under no-load and loaded conditions.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Doosan service manual for your specific serial number and software version. If you lack proper diagnostic tools or experience with high-pressure hydraulic systems, consult a certified Doosan service technician to prevent injury or further machine damage.