Doosan DX230LC-9C Fault Code E000105-05: Complete Diagnostic Guide

What is Doosan DX230LC-9C Fault Code E000105-05?

Fault Code E000105-05 indicates a communication error or voltage irregularity in the main controller network, specifically affecting the CAN (Controller Area Network) bus system between the engine ECM (Engine Control Module) and the machine's display monitor.

This diagnostic trouble code (DTC) signals that the electronic control unit is detecting abnormal data transmission or power supply issues within the primary communication network. On the DX230LC-9C, this network is critical because it manages real-time data exchange between the engine control system, hydraulic controllers, and operator interface. When this communication pathway fails, the machine's diagnostic system cannot properly monitor engine parameters, hydraulic functions, or emission controls, potentially leading to reduced performance or complete operational shutdown.

Common Symptoms

When fault code E000105-05 is active, operators typically experience:

• Dashboard warning lights illuminated, particularly the engine malfunction indicator and system error icons
• Intermittent or complete loss of gauge readings on the LCD monitor (RPM, fuel level, coolant temperature)
• Engine derate mode activation, limiting power output to 50-70% of normal capacity
• Erratic hydraulic response or sluggish boom/bucket movements due to incomplete sensor data
• Failure to start in severe cases, with the starter relay refusing to engage

Potential Causes

The most common technical causes for E000105-05 on used DX230LC-9C excavators include:

• Corroded or loose harness connectors at the main wiring junction behind the cab (known wear point on this model)
• CAN bus wiring damage from rodent activity or harness chafing against the swing bearing housing
• Failing ECM power supply relay (typically located in the right-side electrical box)
• Low battery voltage below 22V on the 24V system, causing communication dropout
• Moisture intrusion in the main controller connector (C101) near the fuel tank
• ECM internal fault or corrupted software calibration in high-hour machines

How to Troubleshoot and Fix Code E000105-05

Step 1: Perform Visual Inspection Check all harness connections between the engine ECM (located on the right side of engine block) and the main monitor. On used excavators, inspect for green corrosion on connector pins, cracked wire insulation near pivot points, and evidence of previous repairs with electrical tape.

Step 2: Voltage and Resistance Testing Using a digital multimeter, verify battery voltage at the ECM connector (should read 24-28V with engine running). Test CAN-High and CAN-Low circuit resistance between ECM pins 23 and 24 (should measure 60 ohms ±5 ohms with key off). Check for short circuits to ground on both CAN lines.

Step 3: Communication Testing with Diagnostic Software Connect Doosan DMS (Diagnostic Monitoring System) or compatible J1939 scan tool. Monitor live CAN bus traffic for message dropout or error frames. If communication is intermittent, perform a wiggle test on harnesses while monitoring data stream.

Step 4: Component Replacement Protocol For used machines, clean all connector terminals with electrical contact cleaner before replacing parts. If wiring checks pass, test the ECM power relay (part #2543-1047) and replace if coil resistance is outside 80-120 ohm specification. Only replace the ECM after confirming all wiring and power supply circuits are verified.

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Disclaimer: This guide provides general troubleshooting information. Always consult a certified Doosan technician and refer to the official service manual for your specific machine serial number before performing repairs. Improper diagnosis can lead to costly component replacement and safety hazards.