Hitachi ZW220 Fault Code 14105-2: Complete Diagnostic Guide

What is Hitachi ZW220 Fault Code 14105-2?

Fault Code 14105-2 on the Hitachi ZW220 wheel loader indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a CAN bus communication error between the engine controller and the machine's main control system. This code triggers when the ECM detects an abnormal signal or complete loss of data transmission on the Controller Area Network (CAN) line.

This communication fault is critical because the ZW220's integrated control system relies on constant data exchange between the engine ECM, transmission controller, and hydraulic management systems. When communication breaks down, the machine may enter a protective derate mode or experience erratic performance, directly impacting productivity and potentially causing secondary system failures.

Common Symptoms

When fault code 14105-2 is active, operators typically experience:

• Warning lights illuminated on the dashboard, particularly the engine malfunction indicator and system error lamp
• Sudden power loss or engine derate, limiting maximum RPM to 1500-1800 range
• Intermittent or complete loss of hydraulic function responsiveness
• Erratic transmission shifting or failure to shift properly under load
• Instrument cluster displaying incorrect readings or going blank intermittently

Potential Causes

The most common technical causes for this fault code on used ZW220 machines include:

• CAN bus wiring harness damage from rubbing against the engine block near the fuel filter mounting bracket (known wear point)
• Corroded or moisture-contaminated connector pins at the ECM or main harness junction box
• Failed termination resistors on the CAN network (typically 120-ohm resistors at network endpoints)
• ECM internal failure due to voltage spikes or age-related component degradation
• Damaged shielding on CAN communication cables allowing electromagnetic interference
• Loose or corroded ground connections affecting the entire control network

How to Troubleshoot and Fix Code 14105-2

Step 1: Visual Inspection Begin by thoroughly inspecting the main wiring harness from the ECM to the cab junction box. On used excavators, pay special attention to harness routing near heat sources and moving components. Check all connector pins for corrosion, bent terminals, or moisture intrusion. Clean connectors with electrical contact cleaner and apply dielectric grease.

Step 2: CAN Bus Continuity Testing Using a digital multimeter, measure resistance between CAN-High and CAN-Low terminals at the ECM connector (typically pins 23 and 24). You should read approximately 60 ohms with the key off, indicating proper termination resistors. Check for short circuits to ground on both lines—readings should show infinite resistance.

Step 3: Signal Quality Verification If possible, use Hitachi Dr.EX diagnostic software or an automotive oscilloscope to monitor CAN bus signal quality. Look for voltage levels between 2.5-3.5V on CAN-High and 1.5-2.5V on CAN-Low during communication. Irregular waveforms indicate harness damage or failing components.

Step 4: Component Replacement After isolating the fault location, replace damaged harness sections, corroded connectors, or failed termination resistors. For used machinery, always verify ground integrity at the ECM mounting points and battery connections before condemning the ECM itself.

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Disclaimer: This guide provides general diagnostic information. Always consult the official Hitachi service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs may cause additional damage or safety hazards.