Sumitomo SH210LC-5LR Fault Code 1113: Complete Diagnostic Guide

What is Sumitomo SH210LC-5LR Fault Code 1113?

Fault Code 1113 on the Sumitomo SH210LC-5LR indicates a malfunction in the Engine Speed Sensor (ESS) circuit, specifically detecting an abnormal signal or voltage output from the crankshaft position sensor.

This code is logged by the Engine Control Module (ECM) when it receives erratic, missing, or out-of-range signals from the engine speed sensor. The ESS is critical for proper fuel injection timing, engine RPM monitoring, and overall engine performance. On this Sumitomo model equipped with an Isuzu diesel engine, accurate speed sensor data ensures optimal combustion efficiency and prevents catastrophic timing errors that could damage internal components.

Common Symptoms

When fault code 1113 is active, operators typically experience:

• Hard starting or no-start conditions, especially when the engine is cold
• Intermittent engine stalling during idle or low-load operation
• Erratic RPM fluctuations visible on the instrument panel tachometer
• Engine warning lamp illuminated on the dashboard (amber or red depending on severity)
• Loss of power or engine derating as the ECM enters fail-safe mode to protect the engine

Potential Causes

The most common technical causes for code 1113 on used SH210LC-5LR excavators include:

• Worn or damaged crankshaft position sensor due to heat exposure and age-related degradation
• Corroded or loose electrical connectors at the sensor harness (common failure point near the flywheel housing)
• Damaged wiring harness from abrasion against the engine block or frame rails
• Contaminated sensor face with metal shavings, oil buildup, or debris affecting magnetic pickup
• Faulty ECM (less common, but possible in high-hour machines)
• Improper air gap between sensor tip and flywheel ring gear teeth

How to Troubleshoot and Fix Code 1113

Step 1: Visual Inspection Begin by inspecting the engine speed sensor located on the flywheel housing near the starter motor. Check for physical damage, oil contamination, or debris. Examine the wiring harness for chafing, especially where it routes along the engine block. On used excavators, harness wear at mounting clips is extremely common.

Step 2: Connector and Resistance Testing Disconnect the sensor connector and inspect pins for corrosion or bent terminals. Using a digital multimeter, measure sensor resistance between the two terminals (typical specification: 150-300 ohms at room temperature—consult your service manual). Check wiring continuity from sensor to ECM connector.

Step 3: Signal Testing and Air Gap Verification Reconnect the sensor and use a multimeter set to AC voltage. Crank the engine and verify the sensor produces an AC voltage signal (typically 0.5-5V AC). Measure the air gap between sensor tip and flywheel teeth using feeler gauges (specification typically 0.5-1.5mm). Adjust if necessary.

Step 4: Sensor Replacement and Verification If readings are out of specification or intermittent, replace the crankshaft position sensor with an OEM or quality aftermarket part. Clear fault codes using diagnostic software (Sumitomo service tool or compatible J1939 scanner) and test operate the machine under load.

Disclaimer: This guide provides general diagnostic procedures. Always consult the official Sumitomo service manual for exact specifications. For complex electrical issues or ECM replacement, seek assistance from a certified heavy equipment technician.