What is Doosan DX220LC-9C Fault Code E000110-03?

Fault Code E000110-03 indicates a Main Control Valve (MCV) Solenoid Valve #3 circuit malfunction with an open circuit or abnormal voltage condition. This diagnostic trouble code (DTC) is triggered when the Electronic Control Unit (ECU) detects improper electrical signals from the hydraulic system's proportional solenoid valve responsible for controlling specific boom, arm, or auxiliary hydraulic functions.

In the Doosan DX220LC-9C excavator, the Main Control Valve regulates hydraulic flow through multiple proportional solenoid valves. Solenoid #3 typically controls pilot pressure to one of the primary hydraulic circuits. When this circuit fails, the ECU cannot modulate hydraulic pressure accurately, resulting in degraded machine performance. This code is critical because it directly affects operational efficiency, fuel consumption, and can lead to secondary hydraulic system damage if ignored on used machines with accumulated wear.

Common Symptoms

• Reduced or erratic hydraulic response in specific functions (commonly boom or arm movements feel sluggish or jerky)
• Illuminated malfunction warning light on the instrument cluster with possible audible alarm
• Hydraulic derate mode where machine enters reduced power output to protect systems
• Intermittent loss of specific hydraulic function that may restore temporarily after restarting
• Abnormal hydraulic system noise or pressure fluctuations during operation

Potential Causes

The most common technical causes for E000110-03 on used DX220LC-9C excavators include:

• Open circuit in solenoid wiring harness due to wire breakage, particularly at flex points near the main control valve where cables experience constant movement and vibration
• Corroded or damaged electrical connectors at the solenoid valve or ECU junction, especially on machines operated in wet or corrosive environments
• Failed proportional solenoid valve coil with internal winding damage (resistance out of specification, typically should read 3-7 ohms)
• Chafed wiring harness rubbing against hydraulic lines or frame components—a known wear point on this model series
• ECU power supply issues or internal ECU fault affecting the driver circuit for this specific solenoid channel
• Voltage drop in main power circuit due to aging battery cables, corroded grounds, or failing alternator

How to Troubleshoot and Fix Code E000110-03

Step 1: Visual Inspection and Connector Check Begin by accessing the Main Control Valve located beneath the operator's cab. Inspect the wiring harness routing to Solenoid Valve #3 for obvious damage, chafing, or oil contamination. Disconnect the solenoid connector and examine pins for corrosion, bent terminals, or moisture intrusion. On used excavators, check harness protection sleeves for deterioration—replace damaged protective conduit before proceeding.

Step 2: Electrical Testing with Multimeter Using a quality digital multimeter, measure solenoid coil resistance with the connector disconnected (key off). Specification should be approximately 3-7 ohms (consult service manual for exact values). An open circuit (infinite resistance) confirms solenoid coil failure. Next, check for voltage supply at the harness connector with ignition on—should read approximately 12V DC. Also verify ground circuit continuity (less than 1 ohm resistance to chassis ground).

Step 3: Advanced Diagnostics and Repair Connect Doosan DMS (Diagnostic Master System) diagnostic software or compatible scan tool to perform active solenoid tests. Command Solenoid #3 to activate while monitoring current draw (typical draw: 1.5-2.5 amps). If electrical tests pass but code persists, suspect ECU driver circuit failure. For used machines, always inspect harness routing for wear points before parts replacement—secure harnesses away from sharp edges using proper clamps. Replace faulty solenoid valve or repair wiring as identified, clear codes, and perform operational test under load.

Professional Tip for Used Equipment: Before replacing expensive components, thoroughly clean all connectors with electrical contact cleaner and apply dielectric grease. Many intermittent codes on older excavators resolve with proper connector maintenance and harness repositioning.

---

Disclaimer: This guide provides general troubleshooting information. Always consult the official Doosan service manual for your specific serial number and consider professional diagnostic assistance for complex electrical or hydraulic system repairs. Improper repairs may cause further damage or safety hazards.