Hitachi ZX160LC-5B Fault Code 20133-2: Complete Diagnostic Guide

What is Hitachi ZX160LC-5B Fault Code 20133-2?

Fault Code 20133-2 indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically related to CAN (Controller Area Network) bus communication errors or data transmission failures between the engine controller and other machine systems.

This code triggers when the ECM detects inconsistent or interrupted data signals on the CAN bus network, which serves as the central nervous system for the ZX160LC-5B's electronic controls. The CAN bus coordinates communication between the engine controller, hydraulic systems, and display monitor. When this communication breaks down, the machine cannot properly regulate engine performance, hydraulic functions, or provide accurate diagnostic information to the operator.

For the ZX160LC-5B specifically, this fault is critical because it can cause the machine to enter derate mode or prevent proper coordination between engine load and hydraulic demand, significantly impacting productivity.

Common Symptoms

• Warning light illumination on the instrument panel with reduced engine power output
• Erratic gauge readings or complete loss of monitor display functionality
• Intermittent engine derate or unexpected power reduction during operation
• Hydraulic system irregularities, including sluggish response or inconsistent cycle times
• Multiple fault codes appearing simultaneously due to communication loss across systems

Potential Causes

The most common technical causes for Code 20133-2 on used ZX160LC-5B excavators include:

• Corroded or damaged CAN bus connectors, particularly at the ECM harness connection points behind the operator cab
• Wiring harness chafing at known rub points near the engine mounting brackets and along the right-hand chassis rail
• Failed termination resistors within the CAN network (typically 120-ohm resistors at network endpoints)
• ECM internal failure or corrupted software, more common in machines with 6,000+ operating hours
• Voltage supply issues from the main power harness affecting ECM operation (low battery voltage or poor ground connections)
• Water intrusion into connector housings, especially on machines operated in wet conditions

How to Troubleshoot and Fix Code 20133-2

Step 1: Visual Inspection Begin with a thorough inspection of all wiring harnesses connected to the ECM and CAN bus network. Check for obvious damage, corrosion, or loose connections. On used excavators, pay special attention to harness routing near moving components and heat sources. Clean all connector pins with electrical contact cleaner and apply dielectric grease.

Step 2: Electrical Testing Using a digital multimeter, verify proper voltage supply to the ECM (should read 24V ±2V). Check CAN-High and CAN-Low wire resistance between ECM and display monitor—should measure approximately 60 ohms with key off (indicating proper 120-ohm termination resistors at each end). Test for short circuits to ground on both CAN wires.

Step 3: Advanced Diagnostics Connect Hitachi Dr.EX diagnostic software to read real-time CAN bus data and identify which module is failing to communicate. Monitor communication status while wiggling harnesses to identify intermittent connections. If all wiring tests pass, the ECM may require software reflashing or replacement.

For used excavators, always inspect connector seals and harness protective sleeving for age-related deterioration before replacing expensive components like the ECM.

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Disclaimer: This guide provides general diagnostic information. Always consult the official Hitachi service manual and consider professional assistance for complex electrical diagnostics. Improper repairs may cause additional damage or safety hazards.