Komatsu PC800-7 Fault Code E213: Complete Diagnostic Guide

What is Komatsu PC800-7 Fault Code E213?

Fault Code E213 on the Komatsu PC800-7 indicates a malfunction in the engine coolant temperature sensor circuit or an abnormal coolant temperature reading detected by the Engine Control Module (ECM). This code specifically relates to the coolant temperature sensor sending irregular voltage signals or detecting temperatures outside the normal operating parameters.

The coolant temperature sensor plays a critical role in the PC800-7's SAA6D140E-5 engine management system. It provides real-time data to the ECM for fuel injection timing, engine protection protocols, and hydraulic system optimization. When this sensor fails or sends erratic signals, the machine's performance and longevity are directly compromised.

Common Symptoms

When Code E213 is active, operators typically experience:

• Engine warning light illuminated on the monitor panel with possible audible alarm
• Engine derate mode activated, limiting power output to prevent overheating damage
• Erratic temperature gauge readings or gauge stuck at minimum/maximum positions
• Difficult cold starts or rough idling due to incorrect fuel mapping
• Increased fuel consumption as the ECM defaults to safe-mode enrichment strategies

Potential Causes

The most common technical causes for E213 on used PC800-7 excavators include:

• Coolant temperature sensor failure due to age-related degradation or thermal cycling stress
• Damaged wiring harness near the engine block where heat and vibration cause insulation breakdown
• Corroded or loose connector pins at the sensor plug (common in machines with 5,000+ hours)
• ECM internal fault affecting the sensor input circuit (rare but possible in high-hour machines)
• Coolant contamination causing sensor element fouling or premature failure
• Ground circuit issues specific to the sensor return path

How to Troubleshoot and Fix Code E213

Step 1: Visual Inspection Begin by inspecting the coolant temperature sensor located on the engine block's coolant passage. Check for physical damage, coolant leaks, or corrosion on the connector terminals. On used excavators, pay special attention to harness rub points near engine mounts where vibration causes wire chafing.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor and measure its resistance at ambient temperature (typically 2,000-3,000 ohms at 20°C for Komatsu sensors). Compare readings against manufacturer specifications. Test harness continuity from the sensor connector to the ECM pins, checking for opens or shorts to ground.

Step 3: Live Data Analysis Connect Komatsu diagnostic software (KOMTRAX or compatible scan tool) to monitor real-time sensor voltage (should range 0.5-4.5V depending on temperature). Compare readings with actual coolant temperature using an infrared thermometer.

Step 4: Component Replacement If testing confirms sensor failure, replace with a genuine Komatsu coolant temperature sensor (Part #6754-81-6210 or equivalent). Clean connector terminals with electrical contact cleaner and apply dielectric grease before reconnection.

Disclaimer: This guide provides general diagnostic information. Always consult the official Komatsu PC800-7 service manual and consider professional technician assistance for complex electrical diagnostics or if unfamiliar with high-voltage systems.