What is Hitachi ZX210H-5G Fault Code 14107-2?

Fault Code 14107-2 indicates a malfunction in the engine oil pressure sensor circuit, specifically a signal voltage that is too low or an intermittent connection within the sensor's electrical pathway. This code is triggered when the Electronic Control Module (ECM) detects voltage readings below the manufacturer's specified threshold, typically under 0.5 volts, suggesting either a sensor failure, damaged wiring, or poor ground connection.

For the Hitachi ZX210H-5G excavator, this code is critical because the engine oil pressure sensor provides real-time data to the ECM for engine protection protocols. When oil pressure readings are unreliable, the machine may enter derate mode or shut down entirely to prevent catastrophic engine damage. On used excavators, this fault often stems from age-related connector corrosion or harness wear rather than actual oil pressure problems.

Common Symptoms

• Engine warning light illuminated on the dashboard, often accompanied by an audible alarm
• Engine power reduction or derate mode activation, limiting machine performance to protect internal components
• Erratic oil pressure gauge readings that fluctuate abnormally or drop to zero despite normal engine operation
• Engine shutdown in severe cases, particularly during startup or under load conditions
• Intermittent fault code appearance that clears and returns, indicating a loose connection or damaged wire

Potential Causes

The most common technical causes for Code 14107-2 on used ZX210H-5G excavators include:

• Faulty oil pressure sensor due to internal component degradation or diaphragm failure
• Damaged wiring harness near the engine block where vibration and heat cause insulation breakdown
• Corroded or loose electrical connectors at the sensor terminal or ECM plug, especially in machines exposed to moisture
• Poor ground connection at the sensor mounting point or chassis ground strap
• Worn harness routing where cables rub against the engine or frame, creating intermittent short circuits
• ECM software issues or internal ECM faults (less common but possible in high-hour machines)

How to Troubleshoot and Fix Code 14107-2

Step 1: Visual Inspection Begin by inspecting the oil pressure sensor located on the engine block near the oil filter housing. Check for oil leaks, damaged connectors, or visible wire chafing. On used excavators, pay special attention to harness routing where cables pass near moving components or hot surfaces.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor and measure resistance across the sensor terminals. Compare readings to manufacturer specifications (typically 50-150 ohms at room temperature). Next, check for supply voltage at the harness connector with the ignition on—should read approximately 5 volts. Test for continuity between the sensor ground and chassis ground.

Step 3: Circuit and Connector Verification Inspect all connector pins for corrosion, bent terminals, or moisture intrusion. Clean connections with electrical contact cleaner and apply dielectric grease. Perform a wiggle test on the harness while monitoring live data with Hitachi diagnostic software (Dr.EX or equivalent) to identify intermittent faults.

Step 4: Component Replacement If testing confirms sensor failure, replace with a genuine Hitachi oil pressure sensor (part number specific to ZX210H-5G). After installation, clear fault codes and perform a pressure test using mechanical gauges to verify actual oil pressure matches ECM readings.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Hitachi service manual and consider professional diagnostic services for complex electrical issues or if you're unfamiliar with excavator systems.