What is Hitachi ZX670LC-5A Fault Code 14107-2?

Fault Code 14107-2 indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a data link error between the engine ECM and the main machine controller. This diagnostic trouble code (DTC) is triggered when the CAN bus communication system fails to maintain proper signal transmission between critical control units on the Hitachi ZX670LC-5A excavator.

This code affects the J05E-TB Isuzu engine's ability to communicate with the machine's hydraulic and monitoring systems. The Controller Area Network (CAN) protocol is essential for coordinating engine performance with hydraulic demands, emissions controls, and operator interface displays. When communication breaks down, the excavator cannot properly regulate fuel injection timing, turbocharger boost pressure, or coordinate power delivery with hydraulic pump demands—critical functions for a 66-ton class excavator operating under heavy loads.

Common Symptoms

• Multiple warning lights illuminating simultaneously on the monitor panel, particularly the engine malfunction lamp and diagnostic indicator
• Erratic engine response or inconsistent power delivery when operating hydraulic functions under load
• Loss of critical display data such as engine temperature, fuel consumption readings, or diagnostic information on the LCD monitor
• Intermittent engine derating where power output suddenly reduces to protect systems from uncoordinated operation
• Failure of automatic functions including auto-idle, auto-shutdown features, or emission control regeneration cycles

Potential Causes

The most common technical causes for Code 14107-2 on used ZX670LC-5A excavators include:

• CAN bus wiring harness damage at known friction points near the engine mount brackets and along the right-side chassis rail where cable routing experiences vibration stress
• Corroded or moisture-contaminated connectors at the engine ECM (located under the cab on the right side) or main controller junction box
• Failed terminating resistors within the CAN network causing signal reflection and communication errors
• ECM internal circuit failure due to age-related capacitor degradation or previous voltage spikes from jump-starting procedures
• Loose or damaged ground connections at G301 (engine-to-frame ground) affecting signal reference voltage
• Aftermarket component interference from non-OEM monitoring devices tapped into the CAN system

How to Troubleshoot and Fix Code 14107-2

Step 1: Visual Inspection and Connector Examination Begin by inspecting all CAN bus harness connectors between the engine ECM and main controller. On used machines, check the C-101 connector near the fuel filter assembly and C-208 connector behind the monitor panel—both are vulnerable to oil contamination and corrosion. Clean contacts with electrical contact cleaner and verify pin tension using a small probe. Examine harness routing for abrasion against metal edges, particularly where cables cross the engine valley.

Step 2: Resistance and Continuity Testing Using a digital multimeter, perform resistance checks on the CAN-High and CAN-Low signal wires. With the machine powered off, measure between ECM pins A-17 (CAN-H) and A-18 (CAN-L)—you should read approximately 60 ohms, indicating proper terminating resistor presence. Check continuity from ECM to main controller (typically less than 2 ohms per wire). Test for shorts to ground (should read infinite resistance). Voltage testing with ignition on should show approximately 2.5V on both CAN lines when idle.

Step 3: ECM Power and Ground Verification Verify the ECM receives proper battery voltage (24V nominal) at connector C-102 pin B-1 during cranking and operation. Check ground integrity at the G301 location (engine block to frame)—resistance should be less than 0.5 ohms. On used excavators, remove ground connections, clean contact surfaces with a wire brush, and apply dielectric grease before reassembly.

Step 4: Diagnostic Software Analysis Connect Hitachi Dr.EX diagnostic software or compatible J05E engine diagnostics to read real-time CAN bus activity. Monitor for message transmission errors, missing data frames, or ECM timeout events. The software can identify whether the engine ECM or machine controller is the non-responsive component, preventing unnecessary parts replacement on aging machines.

Step 5: Component Replacement Protocol If diagnostics isolate a failed ECM, ensure replacement units match the software calibration version for your machine's serial number range. After ECM replacement on used machines, parameter programming is essential—incorrect fuel maps or hydraulic coordination parameters can cause performance issues even with new components.

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Disclaimer: This guide provides general troubleshooting information for Code 14107-2. Hydraulic systems operate under extreme pressure, and electrical diagnostics on modern excavators require proper training. Always consult with a certified Hitachi technician or qualified heavy equipment mechanic before performing repairs, especially when working with ECM systems that affect engine safety controls.