What is Komatsu PC200LC-7 Fault Code E113?

Fault Code E113 on the Komatsu PC200LC-7 indicates a hydraulic oil temperature sensor circuit malfunction or abnormally high hydraulic oil temperature reading. This diagnostic trouble code is triggered when the Electronic Control Module (ECM) detects voltage values outside the normal operating range from the hydraulic oil temperature sensor, or when actual oil temperature exceeds safe operating thresholds (typically above 110-120°C).

This code is critical for the PC200LC-7 because excessive hydraulic oil temperature can cause rapid seal degradation, reduced hydraulic efficiency, and potential damage to pumps, motors, and control valves. The hydraulic system is the lifeblood of excavator operation, and temperature monitoring protects expensive components from thermal damage. In used machines, this sensor circuit becomes particularly vulnerable to wear and environmental exposure.

Common Symptoms

• Hydraulic oil temperature warning light illuminated on the instrument cluster (red or amber indicator)
• Reduced machine performance including slower boom/arm/bucket movements as the ECM may activate protective derate mode
• Audible warning alarm sounding intermittently or continuously during operation
• Noticeably hot hydraulic oil reservoir or lines to the touch after minimal operation
• Erratic temperature gauge readings fluctuating between normal and abnormally high values

Potential Causes

On used Komatsu PC200LC-7 excavators, Code E113 typically results from these issues:

• Faulty hydraulic oil temperature sensor due to internal element degradation (common after 8,000+ operating hours)
• Damaged or corroded wiring harness between the sensor and ECM, especially where the harness passes near the hydraulic tank or sharp frame edges
• Poor electrical connections at the sensor plug caused by moisture intrusion, corrosion, or loose terminals
• Actually elevated hydraulic oil temperature from blocked hydraulic oil cooler fins, failed cooling fan, or low coolant flow
• ECM internal fault (rare) causing incorrect signal interpretation
• Previous repair work where harness routing creates friction points not present in original configuration

How to Troubleshoot and Fix Code E113

Step 1: Visual Inspection Before connecting diagnostic tools, physically inspect the hydraulic oil temperature sensor (located on the hydraulic tank). Check for damaged wiring, corroded terminals, or oil contamination on the connector. On used excavators, verify the harness isn't rubbing against sharp metal edges—a common failure point on the PC200LC-7 near the left-side tank mounting.

Step 2: Test Sensor Resistance Disconnect the sensor and measure resistance using a digital multimeter. At 20°C (68°F), resistance should read approximately 2,000-3,000 ohms (consult the PC200LC-7 service manual for exact specifications). Compare readings at different temperatures if possible. Values outside specification indicate sensor replacement is needed.

Step 3: Check Circuit Voltage With ignition on and sensor disconnected, check for 5-volt reference voltage at the harness connector from the ECM. Also verify proper ground continuity (less than 1 ohm resistance to chassis ground). No reference voltage suggests wiring issues or ECM problems.

Step 4: Verify Actual Oil Temperature Use an infrared thermometer to measure actual hydraulic oil temperature at the tank. If oil genuinely exceeds 110°C during normal operation, inspect the hydraulic oil cooler for debris blockage, check cooling fan operation, and verify adequate oil levels.

Step 5: Clear Code and Test After repairs, clear fault codes using Komatsu diagnostic software (KOMTRAX or compatible scan tool) and operate the machine through normal work cycles while monitoring temperature readings.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu PC200LC-7 service manual and consider professional diagnostic assistance for complex electrical issues or if you lack proper diagnostic equipment.