What is Doosan DX150LC-9C Fault Code E000105-03?

Fault Code E000105-03 indicates a hydraulic pump solenoid valve circuit malfunction with an open circuit or excessive resistance detected in the main pump control system. This code is specific to the Doosan DX150LC-9C's electronically-controlled hydraulic system, where the Engine Control Module (ECM) monitors the current flow to the variable displacement pump's proportional solenoid valve.

In the DX150LC-9C, this solenoid regulates hydraulic flow based on operator demand and engine load. When the ECM detects resistance above approximately 15-20 ohms or an open circuit (infinite resistance), it triggers E000105-03 to prevent hydraulic system damage. This fault directly impacts machine productivity, as the hydraulic pump cannot properly adjust displacement, leading to reduced performance or complete hydraulic failure.

Common Symptoms

• Hydraulic system derate or complete loss of hydraulic power across all functions (boom, arm, bucket, swing)
• Warning light illuminated on the instrument cluster with fault code displayed on monitor
• Sluggish or unresponsive hydraulic controls, particularly during high-demand operations
• Engine runs normally but machine cannot perform work functions
• Intermittent hydraulic performance that may worsen as operating temperature increases

Potential Causes

The most common causes for E000105-03 on used DX150LC-9C excavators include:

• Damaged or corroded wiring harness at the main pump mounting area, where vibration and hydraulic fluid contamination cause insulation breakdown
• Failed proportional solenoid valve coil on the main hydraulic pump (Doosan uses electronically-controlled variable displacement pumps prone to coil failure after 5,000+ hours)
• Connector corrosion at the 4-pin pump solenoid connector, especially on machines operated in wet or coastal environments
• Chafed wires where the harness routes near the pump mounting bracket—a known wear point on the DX150LC series
• ECM internal fault (less common) affecting the solenoid driver circuit

How to Troubleshoot and Fix Code E000105-03

Step 1: Visual Inspection Inspect the wiring harness from the ECM to the main pump solenoid valve. Check for obvious damage, burned insulation, or oil contamination. On used excavators, pay special attention to harness routing near sharp edges and the pump mounting bracket where friction commonly occurs.

Step 2: Connector and Resistance Testing Disconnect the 4-pin solenoid connector at the pump. Inspect for corrosion, bent pins, or moisture intrusion. Using a digital multimeter, measure resistance across the solenoid coil terminals (typically pins 1 and 3). Specification should be 8-12 ohms. Readings above 15 ohms or infinite resistance confirm solenoid coil failure or open circuit in the harness.

Step 3: Voltage Supply Check With ignition on and connector attached, backprobe the connector to verify the ECM is supplying proper voltage (typically 12V PWM signal). Use Doosan DMS (Diagnostic Monitoring System) software to command solenoid activation and monitor actual vs. commanded current (should be 0.8-1.2A).

Step 4: Repair or Replace If resistance is out of specification, replace the proportional solenoid valve assembly on the pump (Doosan part number varies by pump manufacturer—Kawasaki or Doosan-branded). If harness damage is found, repair using heat-shrink solder connections and reroute away from wear points. Clear codes with DMS software and perform operational test.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Doosan service manual for your specific serial number and consider professional diagnosis for complex hydraulic-electronic issues. Improper repairs may cause further damage to expensive hydraulic components.