What is Doosan Excavator Fault Code E000105-15?

Fault Code E000105-15 indicates a hydraulic pump solenoid valve circuit malfunction with an open circuit or excessive resistance detected in the control system. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects abnormal electrical values in the proportional solenoid valve circuit that regulates hydraulic pump displacement and flow control.

In Doosan excavators, this code specifically relates to the main pump control system, which is critical for managing hydraulic pressure and flow distribution to all work functions. When this circuit fails, the machine's ability to modulate hydraulic power efficiently is compromised, potentially leading to reduced productivity and increased fuel consumption. The "15" suffix typically indicates an open circuit condition or wiring discontinuity within the solenoid valve control circuit.

Common Symptoms

When fault code E000105-15 is active, operators may experience:

• Reduced hydraulic power across all functions (boom, arm, bucket, and swing movements feel sluggish or weak)
• Illuminated warning lamp on the instrument cluster, often accompanied by an audible alarm
• Machine entering derate mode, limiting engine RPM to protect the hydraulic system
• Erratic hydraulic response where movements are inconsistent or unresponsive
• Increased fuel consumption due to the ECM defaulting to failsafe pump settings

Potential Causes

The most common technical reasons for this fault code in used Doosan excavators include:

• Damaged or corroded wiring harness near the main pump area, especially where harnesses contact the frame or experience vibration
• Failed proportional solenoid valve due to internal coil breakdown or contaminated hydraulic fluid causing mechanical sticking
• Connector corrosion at the solenoid valve plug, particularly common in machines operating in wet or marine environments
• Broken or chafed wires at known rub points behind the pump mounting bracket
• ECM internal fault or poor ground connection at the controller
• Hydraulic contamination causing the solenoid spool to stick, increasing electrical draw

How to Troubleshoot and Fix Code E000105-15

Step 1: Visual Inspection Begin by thoroughly inspecting the wiring harness from the ECM to the hydraulic pump solenoid valve. On used excavators, check for harness wear at mounting points, particularly where the harness passes near sharp edges or rotating components. Examine all connectors for corrosion, bent pins, or moisture intrusion.

Step 2: Electrical Testing Using a digital multimeter, disconnect the solenoid valve connector and measure resistance across the solenoid coil terminals. Typical resistance should range between 3-8 ohms (consult your specific service manual). Check for continuity in the wiring from the ECM connector to the solenoid. Measure voltage supply at the connector with the ignition on—you should see battery voltage (approximately 24V for Doosan machines).

Step 3: Component and Ground Testing Verify the ground circuit integrity by measuring resistance between the solenoid ground pin and chassis ground (should be less than 1 ohm). If electrical values are correct but the code persists, the solenoid valve itself may have internal mechanical failure. Before replacing expensive components on used equipment, clean all connectors with electrical contact cleaner and check for hydraulic oil contamination that may indicate seal failure within the solenoid assembly.

Step 4: Advanced Diagnostics Connect Doosan diagnostic software (DMS-5 or equivalent) to monitor live solenoid command values versus actual current draw. This can identify intermittent failures or ECM-side issues.

Disclaimer: This guide provides general troubleshooting procedures for informational purposes. Always consult the manufacturer's service manual for your specific machine model and serial number. If you're unfamiliar with hydraulic systems or electrical diagnostics, consult a certified Doosan technician to prevent injury or further equipment damage.