Doosan DX225LC-9C Fault Code E000110-03: Complete Diagnostic Guide

What is Doosan DX225LC-9C Fault Code E000110-03?

Fault Code E000110-03 indicates a critical malfunction in the engine control system, specifically related to abnormal signal detection from the Engine Control Module (ECM) communication circuit. This code triggers when the ECM detects irregular or interrupted communication between the engine controller and the main machine controller, compromising the excavator's ability to properly regulate engine performance and hydraulic functions.

This fault directly impacts the CAN bus communication network that links the engine ECM with the machine's integrated control system. On the DX225LC-9C, this communication pathway is essential for coordinating engine output with hydraulic demand, fuel injection timing, and emission control systems. When communication fails, the excavator cannot optimize performance based on real-time load conditions, potentially leading to inefficient operation or complete shutdown.

Common Symptoms

• Engine warning lamp illuminated on the instrument cluster, often accompanied by a reduction in engine power (derate mode)
• Intermittent loss of hydraulic power or sluggish response during operation, especially under heavy loads
• Erratic engine RPM fluctuations that don't correspond to throttle input
• Inability to access diagnostic information through the monitor panel due to communication failure
• Unexpected engine shutdown or failure to start in severe cases

Potential Causes

The E000110-03 code typically stems from several age-related issues common in used excavators:

• Damaged or corroded wiring harness connections between the ECM and main controller, particularly at connector points near the engine firewall where vibration and heat exposure are highest
• Failed ECM relay or loose power supply connections causing intermittent voltage drops
• Water intrusion into ECM connectors, especially on machines operated in wet conditions or stored outdoors
• ECM internal failure due to voltage spikes or age-related component degradation
• Corroded ground connections at chassis grounding points, creating resistance in the communication circuit
• Physical harness damage from rodent activity or rubbing against frame components during boom/arm movement

How to Troubleshoot and Fix Code E000110-03

Step 1: Visual Inspection of Harnesses and Connectors Begin by thoroughly inspecting the main wiring harness running from the ECM (located behind the operator's cab) to the engine compartment. On used DX225LC-9C excavators, check for harness chafing near the swing bearing and along the engine mounting brackets. Disconnect the ECM connector and inspect pins for corrosion, bent contacts, or moisture. Clean contacts with electrical contact cleaner and apply dielectric grease before reconnection.

Step 2: Electrical Testing with Multimeter Using a digital multimeter, verify battery voltage (12-14V) at the ECM power supply pins with the key in the ON position. Test CAN-High and CAN-Low circuit resistance between the ECM and main controller—you should measure approximately 60 ohms across the terminated CAN bus. Check all chassis ground points for resistance below 0.5 ohms; clean and tighten connections as needed.

Step 3: Diagnostic Software Analysis Connect Doosan DDS (Doosan Diagnostic System) or compatible diagnostic software to retrieve detailed fault data and communication status. Monitor live data to identify if communication dropouts occur during specific conditions. Perform a CAN bus integrity test to verify signal quality. For used excavators, review fault history—repeated codes may indicate intermittent connection issues requiring harness replacement rather than simple cleaning.

Step 4: Component Replacement Protocol If testing reveals a faulty ECM, ensure replacement units match the machine's software version and are properly programmed before installation. When replacing harnesses on used machines, route new wiring away from heat sources and secure with proper clips to prevent future wear. Always clear codes and perform a system relearn procedure after repairs.

---

Disclaimer: This guide provides general diagnostic information for Code E000110-03. Complex electrical issues may require consultation with a certified Doosan technician or authorized service center with access to proprietary diagnostic tools and updated technical service bulletins specific to your machine's serial number.