What is Doosan DX230LC-9C Fault Code E000108-04?

Fault Code E000108-04 indicates a hydraulic pump solenoid proportional valve circuit failure with an abnormal voltage condition detected by the Electronic Control Unit (ECU). This code specifically relates to the main hydraulic pump's electronic control system, which regulates pump displacement and flow based on operator demand and load requirements.

On the DX230LC-9C, this fault affects the proportional solenoid valve that controls hydraulic pump swash plate angle. The "-04" suffix typically indicates a voltage level outside the acceptable range—either too high or too low—preventing proper communication between the ECU and the hydraulic control valve. This is critical because the DX230LC-9C relies on precise electronic control of its variable displacement pumps to deliver optimal performance and fuel efficiency during operation.

Common Symptoms

When Code E000108-04 is active, operators typically experience:

• Check engine or hydraulic warning light illuminated on the instrument cluster
• Reduced hydraulic power across all functions (boom, arm, bucket, swing)
• Machine may enter derate mode, limiting engine RPM to protect the hydraulic system
• Sluggish or unresponsive controls, particularly during combined operations
• Intermittent loss of hydraulic power that may reset after machine shutdown

Potential Causes

The most common technical causes for this fault code on used DX230LC-9C excavators include:

• Damaged wiring harness between the ECU and pump solenoid valve, especially at flex points near the pump mounting area where vibration causes wire chafing
• Failed proportional solenoid valve due to internal coil degradation or contaminated hydraulic oil causing valve sticking
• Corroded or loose electrical connectors at the solenoid valve or ECU—common in machines with high operating hours
• ECU power supply issues, including poor ground connections or damaged power distribution harness
• Hydraulic oil contamination causing valve spool binding and increased electrical current draw

How to Troubleshoot and Fix Code E000108-04

Step 1: Visual Inspection Begin with a thorough examination of the wiring harness from the main ECU (located in the cab) to the hydraulic pump solenoid valve. On used excavators, check specifically where harnesses pass near the engine block and pump mounting—these are known rub points. Inspect all connectors for corrosion, bent pins, or hydraulic oil contamination.

Step 2: Electrical Testing Using a digital multimeter, disconnect the solenoid valve connector and measure resistance across the valve coil terminals. Specifications typically range from 3-8 ohms (consult your service manual). Check for voltage supply at the connector with the key on—should read approximately 12-24V DC depending on system design. Also verify ground circuit continuity with less than 0.5 ohms resistance.

Step 3: Solenoid Valve Testing If electrical values are correct, the proportional valve itself may be faulty. Remove the valve and inspect for physical damage, oil contamination, or stuck components. With used machines, worn valve spools can cause erratic current draw triggering this fault.

Step 4: Diagnostic Software Connect Doosan DDS (Doosan Diagnostic System) or compatible diagnostic software to monitor real-time solenoid valve command signals versus actual response. This helps identify whether the ECU is sending proper signals or if feedback sensors are providing incorrect data.

Step 5: Check Hydraulic System Since this is a used machine, verify hydraulic oil condition and check for metal contamination that might indicate pump wear. Contaminated oil can cause valve sticking and increased electrical resistance.

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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 diagnosis if you're unsure about electrical or hydraulic system repairs. Improper repairs may cause additional damage or safety hazards.