Sumitomo SH210LC-5LR Fault Code 193: Complete Diagnostic Guide

What is Sumitomo SH210LC-5LR Fault Code 193?

Fault Code 193 on the Sumitomo SH210LC-5LR indicates a malfunction in the Engine Control Module (ECM) communication circuit or a failure in the controller area network (CAN) data link system. This diagnostic trouble code specifically points to interrupted or corrupted data transmission between the engine controller and other critical machine systems.

The CAN bus communication system is the nervous system of modern excavators, allowing the ECM, hydraulic controllers, and display monitors to share real-time operational data. When Code 193 triggers, the machine's ability to coordinate engine performance with hydraulic demand becomes compromised. This is particularly critical on the SH210LC-5LR because its load-sensing hydraulic system relies heavily on constant ECM feedback to optimize fuel efficiency and prevent engine overload during high-demand operations.

Common Symptoms

When Code 193 is active on your Sumitomo SH210LC-5LR, operators typically experience:

• Warning lamp illumination on the instrument cluster with possible error messages on the digital display
• Intermittent loss of engine power or unexpected engine derate mode activation
• Erratic hydraulic response or reduced swing/boom speed due to communication loss between controllers
• Gauges displaying incorrect readings or freezing at specific values (RPM, temperature, pressure)
• Engine starting normally but exhibiting performance issues once under load

Potential Causes

The most common technical causes for Code 193 on used Sumitomo excavators include:

• Corroded or loose CAN bus connectors at the ECM harness junction (common wear point behind the operator cab)
• Damaged wiring harness where cables route along the engine bay frame rails, particularly susceptible to vibration damage
• Failed ECM ground connection due to rust accumulation on mounting bolts or ground strap deterioration
• Water intrusion into the main controller connector from damaged cab seals or improper storage
• ECM internal failure (less common but possible in high-hour machines exceeding 8,000 operating hours)
• Voltage irregularities from a failing alternator or weak battery creating communication disruptions

How to Troubleshoot and Fix Code 193

Step 1: Visual Inspection and Connector Check Begin by inspecting all ECM connectors for corrosion, bent pins, or moisture. On used excavators, pay special attention to the main CAN bus connector located near the right-side battery box. Disconnect, clean with electrical contact cleaner, apply dielectric grease, and firmly reconnect. Check for obvious harness damage along routing paths.

Step 2: Electrical Testing with Multimeter Using a digital multimeter, verify battery voltage (should read 12.4-12.8V at rest). Check the ECM ground circuit by measuring resistance between the ECM ground pin and chassis ground—it should read less than 0.5 ohms. Test CAN High and CAN Low wires for continuity and proper resistance (typically 60 ohms between CAN-H and CAN-L with all modules connected).

Step 3: Advanced Diagnostics Connect Sumitomo-compatible diagnostic software (PC-based service tool) to read live data and verify communication status with all modules. Monitor for intermittent communication dropouts. If all connections test properly but the code persists, the ECM may require replacement or professional reprogramming.

Critical for Used Machines: Before replacing the ECM (expensive), thoroughly inspect harness rub points where cables contact the frame near the turntable and engine mounts—these are known failure areas on the SH210LC-5LR.

---

Disclaimer: This guide provides general troubleshooting information. Always consult the official Sumitomo service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs may void warranties or create safety hazards.