What is Doosan Excavator Fault Code E000105-01?

Fault Code E000105-01 indicates a communication error between the Engine Control Module (ECM) and the Main Controller (Display/Monitor) in Doosan excavators. This diagnostic trouble code (DTC) specifically signals that the CAN Bus communication circuit has experienced an abnormal interruption or data transmission failure between these critical control systems.

This fault is critical because the ECM and Main Controller must maintain constant communication to coordinate engine performance, hydraulic functions, and operator interface displays. When communication breaks down, the excavator's integrated control system cannot properly regulate fuel injection timing, engine load management, or transmit vital diagnostic information to the operator display. For used Doosan excavators, this code often surfaces due to age-related wiring degradation or connector corrosion affecting the Controller Area Network (CAN) data lines.

Common Symptoms

• Warning light illumination on the instrument cluster, often accompanied by a communication error message on the LCD display
• Intermittent or complete loss of engine parameter readings (RPM, coolant temperature, fuel level) on the monitor
• Engine derate mode activation, limiting power output to protect systems when communication fails
• Erratic engine behavior including rough idle or unexpected throttle response due to incomplete sensor data transmission
• Inability to access diagnostic menus or real-time machine data through the operator interface

Potential Causes

The most common technical causes for E000105-01 in used Doosan excavators include:

• Damaged or corroded CAN Bus harness connectors, particularly at junction points near the engine bay where moisture and debris accumulate
• Wiring harness abrasion at known rub points along the main chassis frame, especially where cables pass through bulkheads or near rotating components
• Failed termination resistors in the CAN network (typically 120-ohm resistors at network endpoints)
• ECM or Main Controller internal failure, though less common than wiring issues in older machines
• Loose or oxidized ground connections affecting circuit reference voltage stability
• Voltage supply issues to either controller, often caused by failing relays or corroded power distribution connections

How to Troubleshoot and Fix Code E000105-01

Step 1: Visual Inspection of CAN Network Harness Begin by thoroughly inspecting the entire wiring harness between the ECM (located near the engine) and the Main Controller (cab-mounted). Look specifically for chafed insulation, crushed wires, or connector corrosion. On used excavators, pay special attention to harness routing near hydraulic lines where vibration causes rubbing. Clean all connector pins with electrical contact cleaner and check for bent terminals.

Step 2: Test CAN Bus Circuit Continuity and Resistance Using a digital multimeter, disconnect both the ECM and Main Controller connectors. Measure resistance between CAN-High and CAN-Low terminals (typically pins identified in the service manual). You should read approximately 60 ohms with both controllers disconnected, indicating proper termination resistors. Check continuity of each CAN wire individually—any open circuit indicates a break requiring harness replacement.

Step 3: Verify Power Supply and Ground Circuits Confirm that both controllers receive proper voltage supply (typically 24V DC on Doosan machines). Check voltage at controller connectors with ignition on—readings below 22V indicate power supply problems. Verify ground circuit integrity by measuring resistance from controller ground pins to chassis ground (should be less than 1 ohm). Corroded ground straps are extremely common in used machines.

Step 4: Advanced Diagnostics with Doosan Software If physical inspection reveals no issues, connect Doosan DMS (Diagnostic Master System) or compatible diagnostic software. Monitor live CAN Bus traffic to identify whether communication failures are intermittent or constant. Check for additional fault codes that might indicate which controller is failing to transmit. For used excavators with unknown service history, reflashing ECM and controller firmware sometimes resolves corruption-related communication errors.

Step 5: Component Replacement After isolating the fault location, replace damaged harness sections using OEM-specification CAN cable (twisted-pair, shielded). If testing confirms controller failure, replacement of the ECM or Main Controller may be necessary, though always verify harness integrity first to avoid unnecessary parts replacement on used equipment.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Doosan service manual for your specific excavator model and serial number. If unfamiliar with electrical diagnostics or CAN Bus systems, seek assistance from a certified Doosan technician to prevent further damage to electronic control systems.