Komatsu PC210-10 Fault Code E-13: Complete Diagnostic Guide

What is Komatsu PC210-10 Fault Code E-13?

Fault Code E-13 on the Komatsu PC210-10 indicates a malfunction in the engine speed sensor circuit, specifically detecting abnormal signal voltage or a complete loss of signal from the crankshaft position sensor to the Engine Control Module (ECM).

This code relates directly to the electromagnetic pickup sensor that monitors crankshaft rotation and provides critical timing data to the ECM. The Komatsu SAA6D107E-1 engine in the PC210-10 relies on precise engine speed readings to control fuel injection timing, throttle response, and emission systems. Without accurate sensor feedback, the machine cannot operate efficiently or may enter protective derate mode to prevent engine damage.

For used excavators, this fault becomes increasingly common as wiring harnesses age and sensors accumulate contamination from years of vibration and thermal cycling.

Common Symptoms

When Code E-13 is active, operators typically experience:

• Engine warning light illuminated on the monitor panel with audible alarm
• Difficult starting or extended cranking time before engine fires
• Rough idling or inconsistent engine RPM fluctuations
• Loss of engine power with machine entering reduced power mode (derate)
• Complete failure to start if the ECM receives no signal whatsoever

Potential Causes

The most frequent causes of E-13 on used PC210-10 excavators include:

• Failed crankshaft position sensor due to heat exposure or internal coil breakdown
• Damaged or corroded wiring harness between sensor and ECM (common rub point near engine mounts)
• Contaminated sensor face with metal debris or oil buildup affecting magnetic field
• Loose or corroded connector pins at sensor plug (3-pin Deutsch connector)
• Increased air gap between sensor tip and crankshaft reluctor wheel from worn mounting bracket
• ECM internal circuit failure (rare but possible in high-hour machines)

How to Troubleshoot and Fix Code E-13

Step 1: Visual Inspection Begin by locating the crankshaft position sensor on the lower right side of the engine block near the flywheel housing. Inspect the sensor body for physical damage, cracks, or oil contamination. Check the wiring harness for abrasion, particularly where it routes past the engine mount—a known wear point on used machines. Examine the connector for corrosion, pushed-back pins, or moisture intrusion.

Step 2: Sensor Resistance and Voltage Testing Disconnect the sensor harness and use a digital multimeter set to resistance (Ω). Measure across the sensor terminals; you should read between 150-300 ohms at room temperature (refer to Komatsu specifications). If readings are infinite or near zero, the sensor has failed internally. Next, check for supply voltage at the harness connector—you should see approximately 5 volts reference voltage from the ECM with key on, engine off.

Step 3: Air Gap Verification and Harness Continuity Verify the air gap between the sensor tip and crankshaft reluctor wheel teeth using a feeler gauge—spec is typically 0.5-1.5mm. Excessive gap from worn mounting or bracket damage prevents proper signal generation. Test harness continuity from sensor connector back to ECM pins using wiring diagrams from Komatsu technical manual. Check for shorts to ground or voltage. On used excavators, replace any harness sections showing insulation damage or connector corrosion before condemning the sensor itself.

Step 4: Clear Code and Test After repairs, clear fault codes using Komatsu diagnostic software (KOMTRAX) or an appropriate scan tool. Start the engine and monitor for code recurrence under load conditions.

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Disclaimer: This guide provides general diagnostic information. Always consult the official Komatsu PC210-10 service manual and consider professional diagnosis for complex electrical issues. Improper repairs may cause further damage or safety hazards.