What is Hitachi ZW310-5A Fault Code 111704-11?

Fault Code 111704-11 on the Hitachi ZW310-5A wheel loader indicates a communication error or data validity issue with the Engine Control Module (ECM) on the Controller Area Network (CAN) bus. This specific code signals that the machine's main controller is either not receiving data from the engine ECM, receiving corrupted data packets, or detecting an abnormal signal pattern on the CAN communication line.

This code is critical because the CAN bus serves as the central nervous system for modern Hitachi equipment, allowing the engine controller, transmission controller, and machine monitor to share vital operating data. When communication fails, the machine may enter a protective derate mode or display multiple simultaneous fault codes, severely limiting operational capability and potentially causing unsafe operating conditions.

Common Symptoms

• Multiple warning lights illuminating simultaneously on the dashboard, including engine malfunction and transmission alerts
• Intermittent or complete loss of engine power with the machine entering derate or limp mode unexpectedly
• Erratic gauge readings on the monitor display, including RPM, temperature, or fuel level fluctuations
• Failure to start or immediate shutdown after starting, accompanied by warning beeps
• Loss of transmission response or hydraulic function limitations due to protective system engagement

Potential Causes

The most common technical causes for Code 111704-11 on used ZW310-5A loaders include:

• CAN bus wiring harness damage from rubbing against the frame near the engine bay or boom pivot points—a known wear point on this model
• Corroded or loose CAN connector pins at the ECM or main controller, particularly on machines operated in high-moisture or coastal environments
• Failed termination resistors on the CAN network causing signal reflection and data corruption
• ECM internal failure or corrupted software, especially on high-hour machines (8,000+ hours)
• Voltage supply issues to the ECM from failing main power relay or corroded ground connections
• Aftermarket component interference from improperly installed accessories connected to the electrical system

How to Troubleshoot and Fix Code 111704-11

Step 1: Visual Inspection of CAN Bus Harness Inspect the yellow and green CAN high/low wires from the ECM (located on the engine left side) to the main controller. Check for obvious chafing, cuts, or pinch points where the harness passes through bulkheads. On used machines, pay special attention to areas where zip ties have degraded and wires contact metal edges.

Step 2: Check CAN Network Resistance Using a digital multimeter, disconnect both CAN connectors at the ECM and measure resistance between CAN-H and CAN-L pins. You should read approximately 60 ohms with the key off, indicating proper termination resistors. A reading of 120 ohms or infinite resistance indicates termination failure.

Step 3: Inspect ECM Connector and Power Supply Remove the 24-pin ECM connector and inspect for green corrosion, pushed-back pins, or moisture intrusion. Measure voltage at pin 1 (should read 24V key-on) and verify ground continuity at pin 12. Clean connectors with electrical contact cleaner and apply dielectric grease.

Step 4: Test with Diagnostic Software Connect Hitachi Dr.EX diagnostic software to verify actual CAN traffic. Monitor for intermittent dropouts or error frames. If communication is present but unstable, suspect harness issues; if completely absent, the ECM may require replacement or reprogramming.

For used excavators, always replace corroded connectors rather than cleaning alone, as hidden corrosion often causes repeat failures within months.

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Disclaimer: This guide provides general troubleshooting information. Complex electrical diagnostics should be performed by qualified Hitachi-trained technicians with proper diagnostic equipment. Improper repairs may cause additional system damage.