Hitachi ZX470H-3 Fault Code 14105-2: Complete Diagnostic Guide

What is Hitachi ZX470H-3 Fault Code 14105-2?

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

In the ZX470H-3, the CAN bus serves as the critical communication backbone linking the engine ECM, hydraulic controller, and display monitor. When this communication fails, the machine cannot properly coordinate engine performance with hydraulic demands, potentially causing severe operational inefficiencies and safety concerns. This fault is particularly critical because it affects the integrated control system that optimizes fuel efficiency and power delivery.

Common Symptoms

• Warning lights illuminate on the instrument cluster, including the engine malfunction indicator and communication error icons
• Reduced engine power or derate mode activation, limiting machine performance to protect components
• Erratic hydraulic response or sluggish operation due to loss of coordinated control between systems
• Intermittent display failures where the monitor shows incorrect data or goes blank temporarily
• Engine may enter limp mode, restricting RPM to approximately 1,500 or shutting down completely in severe cases

Potential Causes

The most common causes for Code 14105-2 on used ZX470H-3 excavators include:

• Corroded or damaged CAN bus connectors, particularly at the ECM harness connection point near the engine firewall (known wear point on this model)
• Frayed or pinched wiring in the main harness routing behind the cab, where vibration causes insulation breakdown
• Faulty termination resistors on the CAN network (120-ohm resistors that maintain signal integrity)
• ECM internal failure or corrupted software requiring reprogramming
• Voltage irregularities from failing batteries or alternator issues affecting CAN bus power supply
• Water intrusion into connector housings from damaged seals or improper maintenance

How to Troubleshoot and Fix Code 14105-2

Step 1: Visual Inspection Begin by thoroughly inspecting all CAN bus harness connectors for corrosion, bent pins, or moisture. On used excavators, pay special attention to the ECM connector and the junction box behind the operator's seat. Clean connectors with electrical contact cleaner and apply dielectric grease.

Step 2: Resistance Testing Using a digital multimeter, measure resistance between the CAN-High and CAN-Low terminals at the ECM connector with the key off. You should read approximately 60 ohms (two 120-ohm termination resistors in parallel). Readings significantly higher or lower indicate termination resistor failure or wiring issues.

Step 3: Voltage Verification With the key on and engine off, check for 2.5V DC on both CAN-High and CAN-Low lines relative to ground. Significant deviation suggests ECM power supply issues or internal ECM failure.

Step 4: Harness Continuity Check Trace the CAN bus wiring from ECM to the hydraulic controller, checking for continuity and shorts to ground. On used machines, inspect areas where harnesses contact frame members for abrasion damage.

Step 5: Diagnostic Software Analysis Connect Hitachi Dr.EX diagnostic software or compatible scan tool to retrieve detailed fault data, including freeze frame information showing when communication was lost. This helps identify intermittent versus permanent failures.

Step 6: Component Replacement If testing reveals faulty components, replace termination resistors first (least expensive), then damaged harness sections, and finally the ECM if all other tests pass. For used excavators, always verify replacement ECM software matches your machine's configuration.

---

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