Doosan DX520LC-9C Fault Code E000657-13: Complete Diagnostic Guide

What is Doosan DX520LC-9C Fault Code E000657-13?

Fault Code E000657-13 indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a data link error between the main controller and engine management system. This code is part of Doosan's proprietary diagnostic system and signals that the CAN bus communication network has detected an abnormal signal or complete loss of data transmission between critical control modules.

This fault is particularly critical for the DX520LC-9C because this model relies on integrated electronic control for coordinating engine performance, hydraulic flow management, and emission control systems. When communication breaks down, the machine cannot properly regulate fuel injection timing, turbocharger boost pressure, or DEF (Diesel Exhaust Fluid) injection rates, potentially causing the excavator to enter a protective derate mode or fail to start entirely.

Common Symptoms

• Warning light illumination on the instrument cluster, often accompanied by a "Check Engine" or communication error icon
• Engine derate or power reduction, limiting machine to 50-70% of normal operating capacity
• Intermittent loss of dashboard displays, including fuel gauge, temperature readings, or hour meter
• Failure to start or immediate shutdown after ignition due to ECM safety protocols
• Erratic hydraulic response or inconsistent swing/boom speed caused by disrupted load-sensing communication

Potential Causes

Wiring harness damage is the most common culprit in used DX520LC-9C excavators, particularly where harnesses route near the engine mount points or along the boom base where vibration and flexing cause insulation wear.

Corroded or loose CAN bus connectors at the ECM (located behind the operator cab) or at the engine-mounted sensors frequently trigger this code after 5,000+ operating hours.

ECM internal failure or corrupted software can occur, especially in machines exposed to extreme temperature cycling or moisture intrusion through damaged seals.

Aftermarket modifications or improperly installed auxiliary systems (cameras, GPS trackers) that tap into the CAN network without proper isolation.

Low battery voltage or failing alternators causing voltage drops below the 9V threshold required for stable CAN communication.

How to Troubleshoot and Fix Code E000657-13

Step 1: Visual Inspection and Connector Check Begin by inspecting all main harness connectors between the ECM and engine. Focus on the 24-pin ECM connector and the CAN bus termination points. Look for green corrosion, bent pins, or moisture inside connector boots. On used excavators, check harness routing near hydraulic lines where abrasion commonly occurs.

Step 2: Voltage and Resistance Testing Using a digital multimeter, verify battery voltage (should be 24-28V on this model). Test CAN-High and CAN-Low circuit resistance between ECM pins—you should read approximately 60 ohms between the two lines with ignition off. Check for shorts to ground (should read infinite resistance).

Step 3: Diagnostic Software Analysis Connect Doosan DCS (Diagnostic Control System) software or compatible J1939 scan tool to read live data streams. Monitor CAN bus activity and check for message timeout errors. Clear codes and perform a stationary test cycle. If the code returns immediately, suspect ECM failure; if intermittent, focus on harness integrity.

Step 4: Targeted Component Replacement For used machines, replace corroded connectors and repair chafed wiring before condemning the ECM. Apply dielectric grease to all reconnected plugs. If diagnostics confirm ECM failure, ensure replacement units match the machine's software version to avoid compatibility issues.

Disclaimer: This guide provides general troubleshooting information. Complex electrical diagnostics should be performed by certified Doosan technicians with proper equipment. Improper repairs may void warranties or create safety hazards.