What is Doosan DX220LC-9C Fault Code E000110-04?

Fault Code E000110-04 on the Doosan DX220LC-9C excavator indicates a Main Relief Valve #1 Solenoid Current Below Normal (Low Current) condition. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects that the electrical current flowing through the main relief valve proportional solenoid is lower than the manufacturer's specified threshold.

This code specifically affects the hydraulic pressure regulation system on the DX220LC-9C. The main relief valve solenoid controls hydraulic system pressure by modulating flow based on ECM commands. When current drops below normal operating parameters (typically 0.5-1.5 amps depending on load), the system cannot properly regulate hydraulic pressure, directly impacting excavator performance and potentially causing damage to hydraulic components.

Common Symptoms

When fault code E000110-04 is active, operators typically experience:

• Warning light illumination on the instrument cluster with reduced engine power mode
• Loss of hydraulic power or noticeably sluggish boom, arm, or bucket movements
• Inconsistent swing speed or jerky hydraulic operation during combined functions
• Engine derating to protect the hydraulic system, limiting RPM to 1400-1600 range
• Intermittent operation where hydraulic power fluctuates unexpectedly during work cycles

Potential Causes

The most common technical causes for E000110-04 on used DX220LC-9C excavators include:

• Open circuit or break in the solenoid wiring harness, particularly at known rub points near the main pump area
• Failed proportional solenoid coil within the main relief valve assembly (resistance typically should be 3-6 ohms)
• Corroded or loose connector pins at the ECM or solenoid connector (X201 connector common failure point)
• Damaged wiring insulation caused by vibration wear against the pump housing or frame rails
• ECM internal driver circuit failure preventing proper current delivery to the solenoid
• Poor ground connection at G103 ground point on valve bank mounting bracket

How to Troubleshoot and Fix Code E000110-04

Step 1: Initial Inspection Using a multimeter, measure resistance across the main relief valve solenoid connector (disconnected). Normal resistance should read 3-6 ohms. If reading shows open circuit (OL) or infinite resistance, the solenoid coil has failed and requires replacement.

Step 2: Wiring Harness Check Inspect the entire solenoid wiring harness from ECM connector X201 to the relief valve. On used excavators, check for wire chafing at the pump mounting bracket and along the right-side frame rail where harnesses commonly rub. Check connector pins for corrosion, bent pins, or moisture intrusion—common on machines stored outdoors.

Step 3: ECM Output Testing Using Doosan DMS diagnostic software or compatible scan tool, perform an active solenoid test to command the ECM to energize the relief valve solenoid. Monitor actual current draw (should be 0.8-1.2 amps at command). If voltage is present (24V typical) but no current flows with known-good solenoid, suspect ECM driver circuit failure.

Step 4: Ground Circuit Verification Test ground continuity between solenoid ground terminal and battery negative. Resistance should be less than 0.5 ohms. Clean ground point G103 and apply dielectric grease to prevent future corrosion on used machinery.

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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 issues. Improper repairs may void warranties or cause additional damage.