What is Sumitomo SH210-6 Fault Code 7247?

Fault Code 7247 on the Sumitomo SH210-6 excavator indicates a malfunction in the engine coolant temperature sensor circuit or an out-of-range coolant temperature reading detected by the Engine Control Module (ECM). This code specifically signals that the ECM has received abnormal voltage values from the coolant temperature sensor (CTS), which monitors engine operating temperature to optimize fuel injection, timing, and prevent overheating damage.

This fault is critical for the SH210-6 because the engine relies on accurate temperature data to maintain proper combustion efficiency and protect internal components. When this sensor circuit fails, the ECM may default to safe mode, limiting engine performance and potentially causing premature wear on the diesel engine components due to improper fuel mapping.

Common Symptoms

When Code 7247 is active on your Sumitomo SH210-6, operators typically experience:

• Check engine light or malfunction indicator illuminated on the instrument panel
• Engine running rough or experiencing hard starting, especially when cold
• Reduced engine power or derate mode activation to prevent potential overheating damage
• Cooling fan running continuously at high speed regardless of actual engine temperature
• Black smoke from exhaust due to improper fuel-to-air ratio adjustments

Potential Causes

The most common technical reasons for Code 7247 on used SH210-6 excavators include:

• Coolant temperature sensor failure due to age, heat cycling, or internal component degradation
• Damaged or corroded wiring harness connections at the sensor plug (common wear point near engine block)
• Open circuit or short to ground in the sensor wiring, often caused by harness rubbing against engine components
• Contaminated or loose electrical connectors with corrosion from coolant leaks or moisture intrusion
• Faulty ECM (rare, but possible in high-hour used machines with previous electrical issues)
• Low coolant level causing sensor exposure to air instead of coolant

How to Troubleshoot and Fix Code 7247

Step 1: Visual Inspection Begin by checking coolant level and inspecting the coolant temperature sensor (typically located on the engine block near the thermostat housing). Look for physical damage, coolant leaks around the sensor base, or corroded connector pins. On used excavators, carefully examine the wiring harness for rub-through points, especially where it routes near moving components or sharp edges.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor and measure its resistance. A functional CTS typically reads 2,000-3,000 ohms at room temperature (refer to Sumitomo specifications). Test the harness voltage with the key on, engine off—you should see approximately 5 volts reference voltage from the ECM. Check for continuity between sensor ground and chassis ground.

Step 3: Component Replacement and Verification If resistance values are out of specification or the harness shows continuity issues, replace the faulty component. For used machines, always apply dielectric grease to connector pins before reassembly to prevent future corrosion. Clear the fault code using diagnostic software compatible with Sumitomo systems, then run the engine through temperature cycles to verify the repair.

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Disclaimer: This guide provides general troubleshooting information. Always consult the Sumitomo SH210-6 service manual and consider professional diagnostic assistance for complex electrical issues or if you're unfamiliar with heavy equipment repair procedures.