What is Hitachi ZW310-5A Fault Code 111700-11?

Fault Code 111700-11 on the Hitachi ZW310-5A wheel loader indicates a communication error or malfunction in the machine's electrical system, specifically related to the Controller Area Network (CAN) bus communication between the Engine Control Module (ECM) and other critical control units. This code typically signals an interruption or degradation in data transmission across the machine's electronic network.

This fault is critical for the ZW310-5A's performance because the CAN bus serves as the central nervous system for all electronic communications. When this network fails, multiple systems—including engine management, hydraulic controls, and transmission functions—cannot properly coordinate. The Hitachi ZW310-5A relies on seamless ECM communication to optimize fuel delivery, monitor emissions compliance, and regulate hydraulic pressures. Any disruption can lead to reduced machine efficiency, unexpected shutdowns, or safety system malfunctions.

Common Symptoms

When Code 111700-11 is active, operators typically experience:

• Dashboard warning lights illuminated, particularly the engine malfunction or diagnostic indicator
• Intermittent engine derate or reduced power output, especially under load conditions
• Erratic hydraulic response or sluggish loader arm movements due to disrupted control signals
• Difficulty starting or unexpected engine stalling during operation
• Multiple simultaneous fault codes appearing on the diagnostic display, indicating widespread communication failure

Potential Causes

Several technical issues commonly trigger this code on used ZW310-5A machines:

• Damaged or corroded CAN bus wiring harness, particularly at flex points near the engine mount or cab pivot where vibration causes wire chafing
• Faulty ECM connections or loose/oxidized ground terminals on the engine control module
• Failed termination resistors in the CAN network, which are essential for proper signal integrity
• Water intrusion into connectors, especially at the bulkhead pass-throughs where seals deteriorate over time
• ECM software corruption or outdated firmware requiring reprogramming
• Voltage irregularities from failing batteries, alternator issues, or poor chassis ground connections

How to Troubleshoot and Fix Code 111700-11

Step 1: Visual Inspection and Connector Check Begin by thoroughly inspecting all wiring harnesses along the CAN bus circuit. On used excavators, focus on areas where harnesses route near moving components or sharp edges. Check every connector along the network for corrosion, bent pins, or moisture. Clean connections with electrical contact cleaner and apply dielectric grease.

Step 2: Electrical Testing Using a digital multimeter, verify proper voltage at the ECM (typically 24V on this machine). Test CAN-High and CAN-Low circuit continuity and resistance. Between CAN-H and CAN-L terminals, you should measure approximately 60 ohms when the ignition is off, indicating proper termination resistor function. Check for shorts to ground on both circuits.

Step 3: Advanced Diagnostics Connect Hitachi diagnostic software (Dr.EX or equivalent service tool) to read detailed fault data and monitor real-time CAN bus activity. Check for communication dropouts or missing nodes. Inspect the termination resistors (typically 120-ohm resistors at each end of the CAN bus) and replace if defective. For used machinery, verify that previous repairs haven't introduced improper splices or aftermarket components that affect signal quality.

Step 4: ECM and Ground Verification Test all engine ground straps for resistance below 0.5 ohms. Corroded grounds are extremely common on older machines. If all wiring checks pass, the ECM itself may require reprogramming or replacement—consult with a certified Hitachi technician before replacing this expensive component.

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Disclaimer: This guide provides general troubleshooting information. Always consult your machine's service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs can cause additional damage or safety hazards.