Hitachi ZW310 Fault Code 14105-2: Complete Diagnostic Guide

What is Hitachi ZW310 Fault Code 14105-2?

Fault Code 14105-2 on the Hitachi ZW310 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 is part of Hitachi's proprietary diagnostic system and signals that data transmission between critical control units has been interrupted or degraded.

The CAN (Controller Area Network) bus serves as the nervous system of modern excavators, allowing the ECM, transmission controller, and hydraulic systems to share real-time operational data. When this communication fails, the ZW310's integrated systems cannot coordinate properly, potentially affecting engine performance, hydraulic response, and safety monitoring functions. This is particularly critical for the ZW310's load-sensing hydraulic system, which relies on continuous ECM feedback for optimal fuel efficiency and power delivery.

Common Symptoms

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

• Warning lamp illumination on the instrument cluster, often accompanied by a check engine light or communication error icon
• Reduced engine power or derate mode activation, limiting machine performance to protect components
• Erratic hydraulic response or delayed implement movement due to loss of coordinated control
• Intermittent gauge failures, including tachometer, fuel level, or temperature readings dropping to zero
• Difficulty starting or unexpected engine shutdown in severe cases

Potential Causes

The most common technical causes for code 14105-2 on used ZW310 machines include:

• Corroded or damaged CAN bus connectors, particularly at the ECM harness connection points behind the operator cab
• Chafed wiring harness where cables route near the engine mount or steering column—a known wear point on high-hour machines
• Failed termination resistors in the CAN network (120-ohm resistors at network endpoints)
• ECM internal failure or corrupted software, more common in machines with 8,000+ operating hours
• Voltage supply issues from failing alternators or poor ground connections at the frame rail
• Water intrusion into connector seals, especially on machines operated in wet conditions

How to Troubleshoot and Fix Code 14105-2

Step 1: Visual Inspection Begin with a thorough inspection of all wiring harnesses between the ECM (located near the battery box) and the main controller. Check for obvious damage, particularly where harnesses pass through bulkheads or near moving components. On used excavators, pay special attention to connector corrosion—disconnect each CAN bus connector and inspect pins for green oxidation or bent terminals.

Step 2: Electrical Testing Using a digital multimeter, verify CAN bus voltage at the ECM connector. With ignition on and engine off, measure between CAN-High and CAN-Low terminals—you should see approximately 2.5V DC at rest. Check termination resistance by measuring between CAN-High and CAN-Low with all controllers disconnected; proper networks show 60 ohms (two 120-ohm resistors in parallel).

Step 3: Diagnostic Software Analysis Connect Hitachi Dr.EX diagnostic software or compatible scan tool to retrieve freeze frame data. Check communication status with all modules—if only the ECM shows "No Response," the issue is likely ECM-specific. If multiple modules fail to communicate, suspect main harness damage or power supply problems.

Step 4: Component Replacement After isolating the fault, replace damaged harness sections using OEM-spec shielded cable, repair corroded connectors with dielectric grease application, or replace the ECM if internal failure is confirmed. For used machines, always verify software version compatibility when installing replacement ECMs.

Disclaimer: This guide provides general diagnostic information. Complex electrical issues should be diagnosed by certified Hitachi technicians with proper equipment. Always consult the official service manual and follow lockout/tagout procedures before performing electrical work.