What is Hitachi ZX210LCK-5G Fault Code 14107-2?

Fault Code 14107-2 indicates a hydraulic pump displacement sensor circuit malfunction, specifically signaling an abnormal voltage reading or intermittent signal from the pump control system. This diagnostic trouble code (DTC) is generated when the Electronic Control Module (ECM) detects that the displacement sensor voltage falls outside the acceptable range of 0.5-4.5 volts, or when the signal exhibits erratic behavior during operation.

The hydraulic pump displacement sensor is critical for the ZX210LCK-5G's load-sensing hydraulic system. It provides real-time feedback to the ECM about pump swash plate angle, enabling precise control of hydraulic flow and pressure. When this sensor fails, the machine cannot optimize fuel efficiency or maintain proper hydraulic response, directly impacting productivity and potentially causing premature component wear.

Common Symptoms

• Reduced hydraulic power across all functions, with noticeably slower boom, arm, and bucket movements
• Erratic hydraulic response where implements may surge or hesitate unpredictably during operation
• Engine RPM fluctuations as the ECM struggles to match engine speed with hydraulic demand
• Warning indicator illuminated on the instrument cluster, often accompanied by code display on the monitor panel
• Increased fuel consumption due to the system defaulting to a fixed displacement mode rather than load-sensing operation

Potential Causes

The most common technical causes for Code 14107-2 on used ZX210LCK-5G excavators include:

• Sensor connector corrosion at the pump mounting location, where moisture and hydraulic fluid contamination frequently occur
• Wiring harness chafing near the main pump, particularly where the harness passes over the pump housing mounting bracket—a known wear point on this model
• Failed displacement sensor due to internal potentiometer wear or thermal degradation after extended hours
• ECM voltage supply issues affecting the 5-volt reference circuit to multiple sensors
• Damaged sensor pins or terminal tension loss in the connector, common in machines with 5,000+ operating hours

How to Troubleshoot and Fix Code 14107-2

Step 1: Visual Inspection and Connection Check Begin by accessing the hydraulic pump area (left side of engine compartment). Disconnect the displacement sensor connector and inspect for corrosion, bent pins, or oil contamination. On used excavators, this connector often shows green corrosion buildup. Clean with electrical contact cleaner and verify pin tension.

Step 2: Electrical Testing with Multimeter With ignition ON (engine OFF), backprobe the sensor connector harness side to verify 5-volt reference supply and proper ground continuity (less than 0.5 ohms). Then measure sensor resistance across the signal and ground pins—specification is typically 1-6 kΩ depending on swash plate position. Values outside this range indicate sensor failure.

Step 3: Harness Inspection for Wear Points Trace the sensor harness from the pump to the main ECM connector, paying special attention to routing near the pump mounting bolts and engine vibration dampeners. Look for insulation wear or harness hardening from heat exposure—replace damaged sections with proper loom protection.

Step 4: Sensor Replacement and Calibration If testing confirms sensor failure, install a genuine Hitachi replacement sensor (part number specific to ZX210LCK-5G). After installation, use Hitachi Dr.EX diagnostic software to clear codes and perform pump calibration procedure. Test under load to verify proper operation.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Hitachi service manual for your specific machine serial number and seek qualified technician assistance for complex electrical diagnostics or hydraulic system repairs.