What is Hitachi ZX170W-3 Fault Code 13311-3?

Fault Code 13311-3 on the Hitachi ZX170W-3 wheeled excavator indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a CAN (Controller Area Network) bus communication error with a medium severity level. This diagnostic trouble code (DTC) signals that the ECM is unable to properly communicate with other control modules on the machine's network, disrupting critical data exchange between the engine controller, hydraulic system controller, and instrument cluster.

This code is particularly critical for the ZX170W-3 because the Isuzu AU-4LE2X engine relies on continuous ECM communication to regulate fuel injection timing, emissions controls, and hydraulic pump output. When communication breaks down, the machine may enter a protective derate mode to prevent potential damage, significantly reducing productivity on the jobsite.

Common Symptoms

• Warning lamp illumination on the instrument panel, often accompanied by a check engine light or communication error icon
• Reduced engine power or limited hydraulic functions as the ECM enters fail-safe mode
• Intermittent gauge failures, including erratic tachometer, fuel gauge, or temperature readings
• Delayed throttle response or irregular engine RPM fluctuations during operation
• Error messages displayed on the multi-information display indicating "System Error" or "Communication Fault"

Potential Causes

The most common technical causes for Code 13311-3 on used ZX170W-3 machines include:

• CAN bus wiring harness damage from chafing against the engine block or frame rails, particularly near the battery box and along the right-side chassis rail where routing is tight
• Corroded or loose connectors at the ECM (located beneath the operator's cab) or at junction boxes exposed to mud and moisture
• Failed terminating resistor in the CAN network, which maintains proper signal voltage across the communication lines
• ECM internal failure or corrupted software, more common in high-hour machines exceeding 8,000 operating hours
• Low battery voltage or poor ground connections affecting signal integrity on the CAN-High and CAN-Low twisted pair wires

How to Troubleshoot and Fix Code 13311-3

Step 1: Visual Harness Inspection Begin by thoroughly inspecting the main wiring harness from the ECM to the instrument cluster. On used excavators, check for abraded insulation at known rub points behind the fuel tank and near the swing bearing. Look for greenish corrosion inside the gray 38-pin ECM connector and all intermediate junction boxes.

Step 2: Electrical Testing Using a digital multimeter, measure resistance between CAN-High and CAN-Low pins at the ECM connector (consult service manual for specific pin locations—typically pins 22 and 23). You should read approximately 60 ohms with the key off, indicating proper terminating resistor function. Also verify battery voltage is above 12.4V and check the ECM ground circuit for less than 0.5 ohms resistance.

Step 3: Diagnostic Software Analysis Connect Hitachi Dr.EX diagnostic software or an aftermarket tool compatible with J1939 protocol. Monitor real-time CAN bus traffic and check for message transmission errors. Clear the code and perform a functionality test while monitoring communication status—intermittent failures often indicate harness flexing issues rather than component failure.

Step 4: Component Replacement Procedure If testing reveals a faulty ECM, ensure replacement units are programmed with the correct software version for the ZX170W-3. Before installing costly modules on used equipment, always verify harness continuity and repair any damaged wiring, as premature component failure often results from unresolved electrical issues.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Hitachi service manual for your specific machine serial number and consider professional diagnostic assistance for complex electrical repairs. Improper repairs may void warranties or cause additional system damage.