Hitachi ZX210LCN-5B Fault Code 14105-2: Expert Diagnosis and Repair Guide

What is Hitachi ZX210LCN-5B Fault Code 14105-2?

Fault Code 14105-2 indicates a hydraulic pump solenoid valve circuit malfunction, specifically detecting an abnormal current flow or open circuit condition in the main pump control solenoid. This code originates from the ECM (Engine Control Module) monitoring the electrical signal to the hydraulic pump's flow control solenoid valve.

The ZX210LCN-5B's advanced HIOS (Hydraulic Intelligent Operating System) relies on precise solenoid control to regulate pump displacement and optimize fuel efficiency. When code 14105-2 triggers, the ECM detects that the solenoid isn't receiving proper voltage or current, which directly impacts the excavator's ability to match hydraulic output to operational demand. This is critical because improper pump control leads to reduced productivity, excessive fuel consumption, and potential damage to hydraulic components.

Common Symptoms

• Reduced hydraulic power across all functions, with noticeably slower boom, arm, and bucket movements
• Erratic engine rpm fluctuations during loaded operations as the pump cannot properly adjust displacement
• Warning indicator illuminated on the instrument cluster with simultaneous fault code storage
• Increased fuel consumption due to the pump operating in fixed displacement mode rather than load-sensing mode
• Intermittent loss of auxiliary hydraulic function if equipped with optional attachments

Potential Causes

The most common technical failures causing code 14105-2 on used ZX210LCN-5B excavators include:

• Solenoid coil failure within the main pump control valve assembly (resistance typically spec'd at 18-22 ohms)
• Harness chafing or wire breaks at the pump mounting area where vibration causes conductor fatigue
• Corroded or loose connector pins at the C-203 pump solenoid connector, especially in machines with high hour counts
• ECM relay circuit failure preventing proper voltage delivery (should read 12V DC)
• Water intrusion into the connector housing from damaged rubber boots or improper sealing

How to Troubleshoot and Fix Code 14105-2

Step 1: Initial Electrical Verification Using a digital multimeter, check for battery voltage (12V DC) at the pump solenoid connector with the key in the ON position. Disconnect the C-203 connector and inspect for corrosion, bent pins, or moisture—common issues in used excavators.

Step 2: Solenoid Resistance Testing Measure resistance across the solenoid terminals with the harness disconnected. The specification should read 18-22 ohms. Readings outside this range indicate solenoid coil failure requiring replacement of the valve assembly.

Step 3: Harness Integrity Check Trace the solenoid harness from the pump to the ECM, paying special attention to areas where the wire bundle contacts the pump housing or passes through the chassis. On used machines, look for wire insulation wear at vibration points. Perform continuity tests and check for shorts to ground.

Step 4: ECM Output Testing Connect Hitachi Dr.EX diagnostic software to verify ECM output signal integrity. The ECM should pulse the solenoid at varying duty cycles depending on load demand.

Professional Disclaimer: While these diagnostic steps are comprehensive, hydraulic system repairs require proper tools and safety procedures. Consult certified Hitachi technicians or the official service manual for torque specifications and calibration procedures specific to your machine's serial number.