What is Hitachi ZX170W-3 Fault Code 13311-4?

Fault Code 13311-4 on the Hitachi ZX170W-3 excavator indicates a Controller Area Network (CAN) communication error between the Engine Control Module (ECM) and the Machine Control Unit (MCU), specifically reporting a "CAN Bus Communication Timeout" or "Message Reception Failure." This code means the machine's main computer cannot properly receive or send critical operating data to the engine controller, disrupting the coordinated operation between hydraulic systems and engine performance.

This communication failure is particularly critical for the ZX170W-3 because this wheeled excavator relies heavily on integrated ECM-MCU coordination to manage engine load matching, hydraulic pump flow control, and emissions systems. When this CAN bus link fails, the machine cannot optimize fuel consumption or properly execute combined functions like swing-while-digging operations that define modern excavator efficiency.

Common Symptoms

• Amber warning light illuminated on the instrument cluster with reduced engine power (derate mode activated)
• Erratic hydraulic response or sluggish combined movements, particularly during simultaneous boom/swing operations
• Engine RPM fluctuations or failure to maintain set throttle position under load
• Intermittent dashboard display failures showing incorrect fuel level, temperature readings, or blank segments
• Complete engine shutdown in severe cases, with restart capability but immediate fault code reappearance

Potential Causes

The most common root causes for Code 13311-4 on used ZX170W-3 machines include:

• Corroded or loose CAN bus connectors at the ECM (located near the engine) or MCU (behind the operator cab), especially from water intrusion in older units
• Damaged CAN communication wiring harness due to rubbing against the chassis near the turret rotation point—a known wear location on wheeled excavators
• Failing ECM or MCU controller from age-related capacitor degradation (common in machines exceeding 8,000 operating hours)
• Poor ground connections at chassis grounding points, particularly after frame repairs or modifications
• Voltage supply issues from a weak alternator or failing battery creating ECM power instability

How to Troubleshoot and Fix Code 13311-4

Step 1: Visual Inspection and Connector Check Start by disconnecting battery power. Inspect the CAN bus connectors at both the ECM and MCU. Look specifically for green corrosion, pushed-back pins, or moisture inside connector bodies. Clean contacts with electrical contact cleaner and apply dielectric grease before reconnection.

Step 2: Wiring Harness Continuity Test Using a digital multimeter, check continuity on the CAN-High and CAN-Low wires (typically yellow and green wires in Hitachi harnesses) between ECM and MCU. Resistance should read 60 ohms ±5 ohms across the terminated bus. Inspect harness routing near the turret bearing where friction wear commonly damages insulation on used machines.

Step 3: Voltage and Ground Verification With ignition on (engine off), verify 12V supply voltage at both controllers. Check all ground termination points for resistance below 0.5 ohms to chassis. On used excavators, previous repair work often creates compromised grounds.

Step 4: Advanced Diagnostics Connect Hitachi Dr.EX diagnostic software or equivalent CAN bus scanner to monitor real-time communication packets. If hardware checks pass but communication fails, suspect internal ECM/MCU failure requiring controller replacement or professional reprogramming.

Disclaimer: This guide provides general troubleshooting steps. For used excavators with complex electrical histories, consult a certified Hitachi technician or qualified heavy equipment diagnostic specialist before replacing expensive components.