Hitachi ZW310-5A Fault Code 111701-11: Complete Diagnostic Guide

What is Hitachi ZW310-5A Fault Code 111701-11?

Fault Code 111701-11 on the Hitachi ZW310-5A wheel loader indicates a communication error or signal malfunction within the machine's controller area network (CAN) bus system, specifically related to the transmission control module (TCM) or engine control module (ECM) data exchange.

This diagnostic trouble code (DTC) signals that the onboard controller has detected an intermittent or complete loss of communication between critical control systems. The CAN bus network serves as the central nervous system for modern Hitachi excavators, coordinating data between the engine, transmission, hydraulic systems, and dashboard displays. When this communication pathway fails, the machine's integrated control systems cannot properly synchronize operations, potentially leading to reduced performance, erratic shifting, or complete shutdown to prevent component damage.

This fault is particularly critical on the ZW310-5A because this model relies heavily on integrated electronic control for optimizing fuel efficiency and coordinating powertrain performance under varying load conditions.

Common Symptoms

• Dashboard warning lights: The malfunction indicator lamp (MIL) or transmission warning light illuminates on the instrument cluster
• Transmission issues: Erratic gear shifting, failure to shift properly, or transmission stuck in a single gear (limp mode)
• Engine derate: Noticeable power reduction or engine operating in reduced-performance mode to protect drivetrain components
• Intermittent gauge failures: Tachometer, speedometer, or other digital displays showing incorrect readings or going blank
• Error messages: Display screen showing communication-related error codes or system fault notifications

Potential Causes

Wiring harness damage is the most common culprit in used machines—particularly where harnesses run near the transmission housing, engine block, or frame rails where vibration and heat cause insulation breakdown.

Corroded or loose connectors at the ECM or TCM modules, especially in machines with high hours or exposure to moisture and debris accumulation in connector cavities.

Failed CAN bus terminators or damaged twisted-pair wiring within the communication network, often from improper repairs or aftermarket accessory installations.

ECM or TCM module failure, though less common, can occur in high-hour machines due to internal circuit board degradation or power supply issues.

Low battery voltage or poor grounding affecting module operation and creating false communication errors during cranking or high electrical load conditions.

How to Troubleshoot and Fix Code 111701-11

Step 1: Visual Inspection and Connection Check Begin by inspecting all wiring harnesses between the ECM and TCM, paying special attention to areas where wiring contacts the frame, transmission case, or passes through bulkheads. On used excavators, check for rubbed insulation, pinched wires, or evidence of previous repairs. Disconnect and inspect all CAN bus connectors for corrosion, bent pins, or moisture intrusion—clean with electrical contact cleaner and apply dielectric grease before reconnecting.

Step 2: Electrical Testing Using a digital multimeter, verify battery voltage (should be 12.5-14.5V with engine running) and check all ground connections to the ECM and TCM for resistance below 0.5 ohms. Test CAN bus continuity by measuring resistance between the CAN-High and CAN-Low terminals at the ECM connector (should read 50-70 ohms with modules disconnected, indicating proper termination resistance).

Step 3: Module Communication Testing Connect Hitachi's Dr.EX diagnostic software or a compatible J1939 scanner to read active and stored codes, check freeze frame data, and monitor real-time CAN bus activity. Perform a bi-directional communication test to verify each module can send and receive commands. If one module fails to respond, suspect internal module failure. For used machinery, check for aftermarket modifications or non-OEM components that may be interfering with the CAN network.

Step 4: Component Replacement If testing reveals damaged wiring, replace the entire affected harness section rather than splicing, as splices create resistance points. Replace any corroded connectors with OEM parts. If a module has failed, ensure replacement units are programmed with correct software versions compatible with your machine's serial number.

Disclaimer: This guide provides general troubleshooting information. Complex electrical diagnostics and control module programming should be performed by certified Hitachi technicians with proper diagnostic equipment. Always consult the official service manual for your specific machine serial number and software revision.