What is Hitachi ZX210LCK-5G Fault Code 14105-2?

Fault Code 14105-2 on the Hitachi ZX210LCK-5G excavator indicates a malfunction in the Engine Control Module (ECM) power supply circuit, specifically a voltage irregularity or power interruption affecting the main ECM relay system. This code triggers when the ECM detects abnormal voltage levels (either too high or too low) in its primary power feed circuit, which can compromise engine management functions and overall machine reliability.

This fault is critical for the ZX210LCK-5G because the ECM controls fuel injection timing, engine speed regulation, and emission systems. Any power supply disruption can cause erratic engine behavior, reduced performance, or complete shutdown. In used excavators, this code often appears due to aging electrical components, corroded connections, or worn wiring harnesses that have deteriorated over thousands of operating hours.

Common Symptoms

• Engine warning light illuminated on the dashboard with possible derate mode activation
• Intermittent engine stalling or failure to start, especially during cold starts
• Erratic engine RPM fluctuations or difficulty maintaining consistent idle speed
• Loss of throttle response or delayed reaction to joystick inputs
• Complete engine shutdown in severe cases, requiring key cycle reset

Potential Causes

The most common technical causes for Code 14105-2 on used ZX210LCK-5G excavators include:

• Main relay failure – The ECM power relay contacts wear out or become oxidized, creating resistance and voltage drops
• Corroded battery terminals or ground connections – Poor electrical grounding prevents stable voltage delivery to the ECM
• Damaged wiring harness – Chafing at known rub points near the engine mount or chassis frame causes intermittent shorts
• Faulty ECM power supply fuse or fusible link degradation due to age
• Battery voltage irregularities – Weak or failing batteries cannot maintain the 24V system requirements
• ECM internal power circuit failure – Less common but possible in high-hour machines

How to Troubleshoot and Fix Code 14105-2

Step 1: Verify Battery and Ground Connections Check battery voltage with a multimeter – should read 24-26V with engine off. Inspect and clean all battery terminals and ground straps, especially the ECM ground point on the chassis. Corrosion on used machines is a primary culprit.

Step 2: Test the Main ECM Relay Locate the main relay in the fuse box (consult service manual for exact position). Use a multimeter to check relay coil resistance (typically 70-90 ohms) and verify switching function. Listen for audible "click" when ignition is turned on. Replace if contacts show pitting or relay fails bench test.

Step 3: Inspect Wiring Harness and Connectors Physically trace the ECM power harness from battery to ECM, checking for abrasion at frame contact points common in ZX210LCK-5G models. Disconnect ECM connector and inspect pins for corrosion or bent terminals. Check voltage at ECM connector with ignition on – should match battery voltage.

Step 4: Use Diagnostic Software Connect Hitachi Dr.EX diagnostic software or compatible scan tool to monitor live voltage data to the ECM. This identifies intermittent voltage drops that multimeters might miss during static testing.

Step 5: Replace Components as Needed After identifying the faulty component (relay, harness section, or connector), replace with OEM Hitachi parts when possible. For used excavators, consider replacing the entire power harness if the machine has over 8,000 hours, as preventive maintenance against future failures.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Hitachi service manual for your specific serial number and consider professional diagnostic assistance for complex electrical issues.