Sumitomo SH210-6 Fault Code 1113: Complete Diagnostic Guide

What is Sumitomo SH210-6 Fault Code 1113?

Fault Code 1113 on the Sumitomo SH210-6 excavator indicates a Main Pump Solenoid Circuit Malfunction, specifically related to the hydraulic pump's electronic control system. This code triggers when the Engine Control Module (ECM) detects an abnormal voltage or current flow in the proportional solenoid valve circuit that regulates main pump displacement.

This fault directly affects the excavator's hydraulic system performance because the main pump solenoid controls pump output based on operator demand and load sensing. When this circuit malfunctions, the ECM cannot properly modulate hydraulic flow, potentially causing erratic machine behavior or entering a protective derate mode. For the SH210-6's sophisticated load-sensing hydraulic system, maintaining proper solenoid communication is critical for fuel efficiency and operational smoothness.

Common Symptoms

When Code 1113 is active, operators typically experience:

• Reduced hydraulic power across all functions (boom, arm, bucket, and swing)
• Intermittent or complete loss of hydraulic response during operation
• Warning light illumination on the instrument cluster with possible audible alarm
• Erratic pump noise or unusual whining sounds from the main hydraulic pump area
• Engine power derate where the machine limits RPM to protect the hydraulic system

Potential Causes

The most common technical causes for Code 1113 on used SH210-6 excavators include:

• Solenoid coil failure due to overheating or internal short circuit (resistance typically 8-12 ohms)
• Wiring harness damage at known rub points near the pump mounting bracket and undercarriage frame
• Corroded or moisture-infiltrated connectors at the solenoid plug (especially in machines operating in wet conditions)
• ECM internal driver circuit failure preventing proper solenoid energization
• Voltage supply issues from damaged main power harness or poor grounding connections
• Worn connector pins creating intermittent contact at the solenoid or ECM interface

How to Troubleshoot and Fix Code 1113

Step 1: Visual Inspection Begin by inspecting the main pump solenoid connector located on the pump housing. Disconnect the harness and check for corrosion, bent pins, or moisture intrusion. On used excavators, this connector frequently shows wear from vibration and environmental exposure. Clean contacts with electrical contact cleaner and inspect the rubber seal.

Step 2: Solenoid Resistance Testing Using a digital multimeter, measure resistance across the solenoid terminals (connector disconnected). Specification should read 8-12 ohms at room temperature. Values outside this range indicate solenoid coil failure requiring replacement. Also check for shorts to ground (infinite resistance expected).

Step 3: Harness Continuity and Voltage Check With ignition on (engine off), measure supply voltage at the solenoid connector—should read approximately 12-14 volts. Check continuity from the connector back to the ECM pins using wiring diagrams. Inspect harness routing near the pump, especially where it passes the swing motor mounting area (known rub point on SH210-6 models).

Step 4: ECM Driver Circuit Test If solenoid and wiring test good, the ECM driver circuit may be faulty. This requires Sumitomo diagnostic software or compatible scan tool to monitor solenoid command signals versus actual current draw. Compare readings to factory specifications (typically 0.5-2.0 amps under load).

Step 5: Repair and Clear Code Replace failed components (most commonly the solenoid or damaged harness sections). After repairs, clear the fault code using diagnostic software and perform a function test under load. Monitor for code recurrence during a 30-minute operational test.

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Disclaimer: This guide provides general diagnostic procedures for Code 1113. Hydraulic system repairs involve high-pressure components and electrical diagnostics require proper training. Always consult the official Sumitomo service manual and consider professional technician assistance for complex ECM issues or if you're unfamiliar with hydraulic systems on used heavy equipment.