What is Hitachi ZW310-5A Fault Code 111701-10?

Fault Code 111701-10 on the Hitachi ZW310-5A wheel loader indicates a communication error or malfunction in the machine's electronic control system, specifically related to the CAN (Controller Area Network) bus communication between the engine ECM and the machine's main controller. This diagnostic trouble code (DTC) signals that data transmission between critical control modules has been interrupted or compromised.

The CAN bus system serves as the digital nervous system of modern Hitachi equipment, enabling real-time communication between the engine control module, transmission controller, hydraulic management system, and operator display. When this communication pathway fails, the machine cannot properly coordinate functions between systems, potentially leading to reduced performance, safety concerns, and operational limitations. For the ZW310-5A specifically, this fault directly impacts the integration between the Isuzu engine management system and Hitachi's proprietary machine control architecture.

Common Symptoms

• Warning lights illuminating on the instrument panel, particularly the main diagnostic or check engine indicator
• Reduced engine power or hydraulic system operating in derate/limp mode to protect machinery
• Intermittent loss of function in electronic features like automatic transmission shifting or work mode selection
• Erratic gauge readings or complete loss of display information on the operator monitor
• Difficulty starting or unexpected engine shutdown during operation

Potential Causes

The most common technical causes for Code 111701-10 on used Hitachi ZW310-5A machines include:

• Corroded or damaged CAN bus connectors, especially at junction points near the engine compartment where exposure to moisture and vibration is highest
• Harness chafing or wire breaks at known rub points, particularly where wiring passes through the chassis near the articulation joint
• Failed termination resistor in the CAN network causing signal reflection and communication failures
• Faulty ECM or machine controller with internal communication circuit damage
• Voltage irregularities from weak batteries, failing alternators, or poor ground connections affecting digital signal integrity
• Aftermarket modifications or incorrect repairs that compromise CAN bus wiring specifications

How to Troubleshoot and Fix Code 111701-10

Step 1: Visual Inspection and Connector Assessment Begin by thoroughly inspecting all wiring harnesses and connectors in the CAN communication circuit. Focus on the main harness running from the engine ECM (located near the engine firewall) to the machine controller module. On used excavators, pay particular attention to connectors that show green corrosion, bent pins, or moisture intrusion. Clean all connectors with electrical contact cleaner and apply dielectric grease.

Step 2: CAN Bus Voltage and Resistance Testing Using a digital multimeter, measure the CAN bus termination resistance. With the ignition off and both controllers disconnected, you should read approximately 60 ohms between CAN-High and CAN-Low wires (indicating two 120-ohm termination resistors in parallel). Check signal voltage with ignition on—you should see approximately 2.5V at rest, fluctuating between 1.5-3.5V during communication.

Step 3: Diagnostic Software Analysis Connect Hitachi Dr.EX diagnostic software or compatible scan tool to retrieve detailed fault information and monitor live CAN bus traffic. Check for multiple controllers reporting communication errors, which helps isolate whether the issue is with a specific module or the network itself.

Step 4: Harness Continuity and Isolation Perform continuity tests on CAN-High and CAN-Low wires from end to end, checking for opens or shorts to ground. On used machines, inspect areas where the articulation joint flexes, as repeated movement causes wire fatigue and insulation breakdown.

Step 5: Ground Circuit Verification Verify all chassis ground points are clean, tight, and corrosion-free. Poor grounding is especially common on older machines and can cause erratic electronic behavior mimicking communication faults.

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Disclaimer: This guide provides general diagnostic information for experienced technicians. Always consult the official Hitachi service manual for your specific machine serial number, and consider engaging certified Hitachi technicians for complex electronic system repairs. Improper diagnosis can lead to unnecessary part replacement and additional damage.