What is Hitachi ZX350LCK-5G Fault Code 11100-2?

Fault Code 11100-2 indicates a malfunction in the engine control system's communication circuit, specifically a CAN (Controller Area Network) communication error between the Engine Control Module (ECM) and other critical machine controllers. This code is triggered when the ECM detects abnormal or interrupted data transmission on the CAN bus network, which serves as the digital nervous system for the ZX350LCK-5G excavator.

In the Hitachi ZX350LCK-5G, the CAN communication system links the engine controller with the hydraulic pump controller, monitor panel, and other electronic modules. When this network fails, the machine cannot properly coordinate engine performance with hydraulic demands, potentially causing the excavator to enter a protective derate mode or experience erratic system behavior. This fault is particularly critical because modern excavators rely on real-time data exchange between controllers to optimize fuel efficiency, power output, and emissions compliance.

Common Symptoms

• Warning lamp illumination on the instrument cluster with reduced engine power output
• Erratic gauge readings or complete loss of monitor display functionality
• Engine derating to low idle or limited RPM range as a protective measure
• Intermittent loss of hydraulic response or uncoordinated pump operation
• Multiple fault codes appearing simultaneously due to communication breakdown between modules

Potential Causes

The most common causes of Code 11100-2 on used ZX350LCK-5G excavators include:

• Damaged or corroded CAN bus wiring harness, particularly at flex points near the engine mounting area or behind the operator cab where vibration and movement cause wire chafing
• Loose or oxidized connector pins at the ECM, monitor panel, or hydraulic controller connection points—a frequent issue on machines operating in humid or coastal environments
• Failed termination resistors on the CAN network ends, which are essential for proper signal integrity
• ECM internal failure or corrupted software, though less common than wiring issues
• Aftermarket component interference from non-OEM parts that disrupt CAN bus voltage levels (typically 2.5V baseline)

How to Troubleshoot and Fix Code 11100-2

Step 1: Connect Hitachi diagnostic software (Dr.EX or compatible scan tool) to retrieve freeze frame data and identify which specific controller lost communication. Check for additional stored codes that may indicate the failure point.

Step 2: Perform a visual harness inspection focusing on the main wiring bundle from the ECM to the bulkhead connector. On used excavators, examine areas where harnesses contact frame members or pass through grommets. Look for abraded insulation, pinched wires, or discolored connectors indicating water intrusion.

Step 3: Using a digital multimeter, measure CAN-High and CAN-Low voltage at the ECM connector (typically pins should read approximately 2.5V with ignition on, engine off). Check termination resistance across CAN-High and CAN-Low—should measure around 60 ohms with all modules connected.

Step 4: Inspect and clean all connector terminals with electrical contact cleaner, paying special attention to the 38-pin ECM connector and monitor panel connections. Apply dielectric grease to prevent future corrosion—critical for used machines with existing wear patterns.

Step 5: If wiring and connections test properly, perform an ECM reset by disconnecting the battery for 15 minutes. If the code returns immediately, ECM replacement or reprogramming may be necessary.

---

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 issues.