What is Doosan DX220LC-9C Fault Code E000108-04?

Fault Code E000108-04 indicates a Main Control Valve (MCV) Solenoid Valve #4 - Current Below Normal or Short Circuit to Ground. This code triggers when the Electronic Control Unit (ECU) detects abnormally low current flow or a short circuit in the electrical circuit powering the fourth solenoid valve within the main hydraulic control valve assembly.

On the DX220LC-9C, this solenoid controls hydraulic flow to specific functions—typically swing or auxiliary circuits. The ECU continuously monitors amperage draw from each solenoid valve. When current drops below the manufacturer's threshold (usually due to circuit resistance issues or grounding faults), the system logs E000108-04 to prevent hydraulic system damage and erratic machine behavior. This is critical because compromised solenoid operation directly affects hydraulic pressure regulation, leading to reduced productivity and potential secondary component failures.

Common Symptoms

• Intermittent or complete loss of swing function or auxiliary hydraulic circuits
• ECU warning lamp illuminated on the instrument cluster with fault code displayed on the monitor
• Hydraulic response lag or "jerky" operation during combined functions
• Reduced hydraulic power in specific work modes, particularly under load
• Machine may enter derate mode limiting engine RPM to protect the hydraulic system

Potential Causes

The most common technical causes for E000108-04 in used DX220LC-9C excavators include:

• Damaged wiring harness at known rub points near the main control valve (especially where the harness routes along the superstructure frame)
• Corroded or moisture-contaminated connector pins at the MCV solenoid valve #4 connector
• Failed solenoid coil due to overheating or internal winding breakdown (common in high-hour machines)
• Chafed wires creating intermittent short to ground against metal chassis components
• ECU internal driver circuit failure (less common, but possible in older units)
• Poor ground connections at the main control valve mounting bolts or chassis ground points

How to Troubleshoot and Fix Code E000108-04

Step 1: Visual Inspection Begin with a thorough inspection of the wiring harness from the ECU to solenoid valve #4. On used excavators, check harness routing near the swing bearing area and valve bank for abrasion, cuts, or exposed copper. Inspect the connector at the solenoid for corrosion, bent pins, or moisture intrusion—spray with electrical contact cleaner if contamination is present.

Step 2: Electrical Testing Using a digital multimeter, disconnect the solenoid valve #4 connector and measure coil resistance (typically 3-6 ohms for Doosan MCV solenoids—verify with service manual). Check for continuity to ground; any reading indicates a short circuit. Measure supply voltage at the harness connector with ignition on (should read battery voltage, approximately 24V). Low voltage suggests wiring resistance issues.

Step 3: Component and System Verification If wiring and resistance checks pass, test solenoid operation using Doosan diagnostic software (EPOS or DX-Diag). Command the solenoid manually and listen for audible "clicking." No click indicates solenoid failure. For used machines, remove the solenoid valve and inspect for carbon buildup on plunger or coil housing cracks. Replace the solenoid if defective, ensuring new O-rings are installed. Clear codes and perform a function test under load.

Crucial for Used Equipment: Always inspect harness grommets and protective sleeving that may have deteriorated over thousands of operating hours, allowing wire-to-metal contact that creates intermittent faults.

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