What is Doosan Excavator Fault Code E000173-16?

Fault Code E000173-16 indicates a CAN communication error between the Engine Control Module (ECM) and the Monitor Control Unit (MCU), specifically reporting a "Data Valid But Below Normal Operating Range" condition. This diagnostic trouble code (DTC) is part of the J1939 CAN bus protocol used in modern Doosan excavators to enable communication between electronic control systems.

This fault occurs when the ECM detects that data packets received from the MCU are structurally valid but contain values that fall below the manufacturer's specified threshold for normal operation. The CAN bus network is the central nervous system of your excavator, coordinating engine performance, hydraulic functions, and operator display information. When this communication degrades, your machine cannot operate at optimal efficiency, and critical system data may not reach the operator display properly.

Common Symptoms

When Code E000173-16 is active, operators typically experience:

• Warning light illumination on the instrument cluster, often accompanied by a "CHECK" or communication error message
• Intermittent or complete loss of gauge functionality, including fuel level, coolant temperature, or engine RPM displays showing erratic readings
• Reduced engine power or derate mode activation as a protective measure when the ECM cannot verify system parameters
• Error messages appearing and disappearing during machine operation, particularly during vibration or temperature changes
• Inability to access diagnostic information through the standard operator interface

Potential Causes

The most common technical causes for this fault code in used Doosan excavators include:

• Corroded or loose CAN bus connectors at the ECM or MCU harness connection points, especially in machines exposed to moisture
• Damaged CAN communication wiring due to harness chafing against frame components or hydraulic lines—common wear points include routing near the swing bearing and along the boom base
• Faulty termination resistors in the CAN network (should measure 60 ohms across CAN-H and CAN-L)
• ECM or MCU voltage supply issues caused by failing relays, corroded power distribution terminals, or aging main harnesses
• Software version mismatches between ECM and MCU firmware after partial system updates or component replacements
• Water intrusion into control modules from damaged seals or cable glands, particularly common in high-hour used machines

How to Troubleshoot and Fix Code E000173-16

Step 1: Visual Inspection and Connector Verification

Begin by thoroughly inspecting all CAN bus harness connectors between the ECM (typically located near the engine) and the MCU (mounted behind the operator display panel). On used excavators, pay special attention to connector corrosion, bent pins, and evidence of previous water intrusion. Clean all connections with electrical contact cleaner and apply dielectric grease before reconnecting. Check for obvious harness damage, particularly at known rub points along the right-hand chassis rail and where cables pass through the cab floor grommet.

Step 2: CAN Bus Electrical Testing

Using a digital multimeter, verify CAN-H and CAN-L continuity throughout the network. With the key off, measure resistance between CAN-H and CAN-L terminals—you should read approximately 60 ohms, indicating proper termination resistors. Check for short circuits to ground on both CAN lines (should read infinite resistance). With the key on, measure voltage on CAN-H (should read 2.5-3.5V) and CAN-L (should read 1.5-2.5V) relative to ground. Significant deviation indicates network issues or a failing control module.

Step 3: Software and Module Verification

Connect Doosan diagnostic software (DMS-5 or G-SCAN) to verify both ECM and MCU are communicating and check firmware versions for compatibility. Review the freeze frame data associated with fault E000173-16 to identify environmental conditions when the fault occurred. For used machines with unknown service history, verify the ECM and MCU ground connections at their mounting points, as paint buildup or corrosion commonly creates high-resistance ground paths. If all electrical tests pass, the fault may require ECM or MCU replacement, but always verify with known-good components when possible before purchasing expensive control modules.

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Disclaimer: This guide provides general diagnostic information for Doosan excavator fault code E000173-16. Always consult the official Doosan service manual for your specific model and serial number. If you're uncomfortable performing electrical diagnostics, consult a certified Doosan technician or qualified heavy equipment mechanic to prevent damage to sensitive electronic components.