What is Komatsu PC200-7 Fault Code E213?

Komatsu PC200-7 Fault Code E213 indicates a malfunction in the hydraulic oil temperature sensor circuit. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an abnormal voltage signal from the hydraulic oil temperature sensor, which monitors the operating temperature of the hydraulic system fluid.

The hydraulic oil temperature sensor plays a critical role in protecting the PC200-7's hydraulic system from overheating damage. When this sensor fails or provides inaccurate readings, the ECM cannot properly regulate hydraulic system performance, potentially leading to reduced machine efficiency, component wear, and costly hydraulic system failures. For used excavators, this code often appears due to age-related sensor degradation or wiring harness issues common in machines with high operating hours.

Common Symptoms

When Code E213 is active on your Komatsu PC200-7, you may experience:

• Warning light illuminated on the instrument cluster, specifically the hydraulic system indicator
• Reduced hydraulic response or slower cycle times during operation
• Intermittent loss of auxiliary hydraulic functions (attachment operation)
• ECM storing fault history even after temperature returns to normal range
• Erratic temperature gauge readings or gauge staying at minimum/maximum position

Potential Causes

The most common technical reasons for E213 on used PC200-7 excavators include:

• Faulty hydraulic oil temperature sensor due to internal element failure or contamination exposure
• Damaged wiring harness between the sensor and ECM, particularly at flex points near the hydraulic tank
• Corroded or loose electrical connectors at the sensor mounting location (common in machines operating in wet/muddy conditions)
• Short circuit or open circuit in the sensor signal wire due to rubbing against frame components
• ECM internal fault (rare, but possible in high-hour machines)
• Low hydraulic oil level causing false temperature readings from sensor exposure to air

How to Troubleshoot and Fix Code E213

Step 1: Visual Inspection Begin by inspecting the hydraulic oil temperature sensor located on the hydraulic oil tank. Check for physical damage, oil leaks around the sensor, and verify the electrical connector is fully seated without corrosion. On used excavators, examine the wiring harness routing for signs of rubbing, cuts, or heat damage—particularly where the harness passes near the swing motor or tank mounting brackets.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor connector and measure resistance across the sensor terminals. At room temperature (68°F/20°C), resistance should typically read 2,000-3,000 ohms (consult your PC200-7 service manual for exact specifications). Next, check for continuity in the wiring harness from the sensor connector back to the ECM connector. Any reading of infinite resistance indicates an open circuit requiring harness repair or replacement.

Step 3: Voltage Signal Verification With the ignition on (engine off), backprobe the sensor connector and measure voltage supply from the ECM—you should see approximately 5 volts on the reference wire. If voltage is absent, trace the circuit for breaks or check ECM pin connections. For used machines, inspect ECM connectors for "pin push-back" and corrosion, common issues in older units.

Step 4: Component Replacement and Verification If testing confirms sensor failure, replace the hydraulic oil temperature sensor with a genuine Komatsu part (OEM part number recommended for reliability). After installation, use Komatsu diagnostic software (KOMTRAX or dealer-level diagnostic tool) to clear the fault code and monitor live sensor data. Verify the temperature reading changes appropriately as the machine warms up during operation.

Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Komatsu PC200-7 service manual and safety procedures. If you're uncomfortable performing electrical diagnostics, contact a certified Komatsu technician to prevent further damage to your used excavator.