What is Hitachi ZX210LC-5B Fault Code 14105-2?

Fault Code 14105-2 on the Hitachi ZX210LC-5B excavator indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically related to CAN Bus (Controller Area Network) communication failure between the engine ECM and the hydraulic control system. This diagnostic trouble code (DTC) signals that the ECM has detected an abnormal signal or complete loss of communication on the CAN network, preventing proper data exchange between critical control systems.

This fault is particularly critical for the ZX210LC-5B because this model relies on integrated electronic control for coordinating engine performance with hydraulic demands. When communication breaks down, the machine cannot optimize fuel injection timing, throttle response, or hydraulic flow rates based on real-time operating conditions. The result is often severely degraded performance or complete shutdown to prevent component damage.

Common Symptoms

• Engine derating or automatic reduction to low idle speed, limiting machine productivity
• Illuminated warning lights on the instrument cluster, specifically the engine malfunction indicator and system error lamp
• Erratic hydraulic response or complete loss of auxiliary hydraulic functions due to failed coordination between systems
• Intermittent loss of display data on the monitor panel, showing blank screens or frozen information
• Engine may start but immediately enter limp mode, preventing normal operational RPM ranges

Potential Causes

The most common technical causes for Code 14105-2 in used ZX210LC-5B excavators include:

• CAN Bus harness damage at known wear points, particularly where wiring runs near the swing motor or along the boom base where vibration and flexing occur
• Corroded or loose connector pins at the ECM harness connection point (C101 connector), especially common in machines with high-hour exposure to moisture
• Failed termination resistors on the CAN network, typically rated at 120 ohms, which degrade over time in older machines
• ECM internal fault or corrupted software, though less common than harness issues in used equipment
• Voltage supply issues to the ECM caused by failing main relays or deteriorated ground connections at G201 ground point
• Previous repair damage where aftermarket harnesses or improper splicing has created impedance mismatches

How to Troubleshoot and Fix Code 14105-2

Step 1: Visual Inspection and Connector Verification Begin by thoroughly inspecting the main engine harness from the ECM to all CAN Bus connection points. On used excavators, focus on areas where the harness contacts the frame—particularly near the engine mounting brackets and along the right-side chassis rail. Check connector C101 at the ECM for corrosion, bent pins, or moisture intrusion. Clean contacts with electrical contact cleaner and apply dielectric grease.

Step 2: CAN Bus Resistance Testing Using a digital multimeter, disconnect the battery and measure resistance across the CAN-High and CAN-Low terminals at the ECM connector. You should read approximately 60 ohms with both termination resistors in the circuit. A reading of 120 ohms indicates one terminating resistor has failed; an open circuit (OL) means both are faulty or there's a complete harness break.

Step 3: Voltage and Signal Testing Reconnect the battery and measure voltage supply to the ECM—verify you have stable 24V DC at pin 1 of connector C101 with the key in the ON position. Using Hitachi diagnostic software (Dr.EX or compatible scan tool), monitor live CAN Bus data while wiggling harnesses to identify intermittent connection failures. Check for proper ground continuity (less than 0.5 ohms) at G201.

Step 4: Signal Integrity and Software Verification If harness and power checks pass, test CAN-High voltage (should be approximately 2.5-3.5V) and CAN-Low voltage (1.5-2.5V) during idle operation. Significant deviation suggests ECM issues. For used machines with aftermarket ECM reflashes, verify the software version matches Hitachi specifications, as incompatible firmware can trigger communication errors.

Critical for Used Equipment: Before replacing the ECM (often $2,000+), meticulously verify all harness routing matches factory specifications, as previous owners may have incorrectly routed cables during boom cylinder or hydraulic pump replacement, creating new rub points.

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Disclaimer: This guide provides general diagnostic information. Always consult the official Hitachi service manual for your specific serial number and seek professional assistance from certified technicians for complex electrical diagnostics. Improper repairs can cause additional system damage or create safety hazards.