What is Hitachi ZX210LC-5G Fault Code 14107-2?

Fault Code 14107-2 indicates a hydraulic pump control solenoid valve circuit malfunction, specifically detecting an abnormal electrical signal or open circuit in the pump control system. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects voltage irregularities or resistance values outside the manufacturer's specified range in the hydraulic pump's proportional solenoid valve circuit.

The Hitachi ZX210LC-5G relies on precise electronic control of its variable displacement hydraulic pump to optimize fuel efficiency and hydraulic performance. When this code activates, the ECM can no longer properly modulate pump output, directly impacting machine productivity and potentially causing the system to enter a protective derate mode. For used excavators, this code often signals age-related electrical deterioration rather than catastrophic component failure.

Common Symptoms

• Reduced hydraulic power across all functions, with noticeably slower boom, arm, and bucket movements
• Intermittent or constant warning light on the instrument cluster, sometimes accompanied by audible alarms
• Engine derating where RPMs are limited to protect the hydraulic system from damage
• Erratic hydraulic response with inconsistent flow rates during multi-function operations
• Increased fuel consumption as the ECM cannot optimize pump displacement for load conditions

Potential Causes

The most common causes for Code 14107-2 on used ZX210LC-5G excavators include:

• Damaged wiring harness near the pump solenoid, particularly where the harness routes along the pump housing (a known wear point on this model)
• Corroded or loose electrical connectors at the solenoid valve due to moisture intrusion or vibration
• Failed proportional solenoid valve within the hydraulic pump assembly, often from internal coil degradation
• ECM internal fault or poor grounding connections at the controller mounting points
• Voltage supply issues from the main power harness or battery connections delivering inconsistent power

How to Troubleshoot and Fix Code 14107-2

Step 1: Visual Inspection Begin by inspecting the wiring harness from the ECM to the hydraulic pump solenoid valve. On used excavators, check for harness abrasion where it contacts the pump body or frame—a common failure point. Examine all connectors for corrosion, bent pins, or moisture. Clean connectors with electrical contact cleaner and apply dielectric grease.

Step 2: Electrical Testing Using a digital multimeter, check solenoid valve resistance. Disconnect the solenoid connector and measure resistance across the coil terminals—typical specifications are 3-7 ohms (consult service manual for exact values). Test voltage supply at the harness connector with ignition on; you should see battery voltage (12-14V). Check for continuity between the ECM ground and chassis ground.

Step 3: Component Testing If wiring checks pass, use Hitachi Dr.EX diagnostic software to perform an active solenoid test while monitoring current draw. Normal operation shows smooth current modulation between 200-800 mA. Erratic readings indicate solenoid failure. For used machines, even if resistance is within spec, internal coil shorts can cause intermittent failures—replacement may be necessary.

Step 4: Advanced Diagnostics Inspect the ECM connector for corrosion and verify all ground straps are secure. On high-hour used excavators, ECM capacitor degradation can cause false codes—professional ECM testing may be required.

Disclaimer: This guide provides general diagnostic information. Always consult the official Hitachi service manual and consider professional assistance for complex electrical diagnostics or hydraulic system repairs.