What is John Deere E240LC Fault Code 000655.13?

Fault Code 000655.13 indicates an "Engine Speed Sensor Circuit - Mechanical System Not Responding Properly" on the John Deere E240LC excavator. This diagnostic trouble code (DTC) signals that the Engine Control Module (ECM) has detected a discrepancy between the commanded engine speed and the actual engine speed feedback from the crankshaft position sensor or camshaft position sensor.

This fault specifically relates to the FMI (Failure Mode Identifier) 13, which points to a mechanical system not responding correctly rather than an electrical short or open circuit. On the E240LC's Isuzu engine platform, this code is critical because the ECM relies on precise engine speed data to control fuel injection timing, throttle response, and hydraulic pump output. When this sensor circuit malfunctions, the entire machine performance becomes compromised, potentially leading to engine derate or shutdown to prevent damage.

Common Symptoms

When fault code 000655.13 is active on your E240LC, operators typically experience:

• Check Engine Light illuminated on the instrument cluster with possible amber warning icon
• Reduced engine power or automatic derate to low-idle mode (1,200-1,400 RPM limit)
• Erratic throttle response or engine RPM fluctuations during operation
• Hydraulic system sluggishness due to inconsistent engine speed affecting pump flow
• Hard starting or extended cranking time, especially when the engine is cold

Potential Causes

The most common technical reasons for this fault code on used E240LC excavators include:

• Crankshaft or camshaft position sensor failure due to heat exposure or internal component degradation (common after 4,000+ hours)
• Damaged or corroded sensor wiring harness near the flywheel housing where vibration and heat cause insulation breakdown
• Worn reluctor ring teeth on the crankshaft or flywheel causing inconsistent signal generation
• ECM software calibration issues or corrupted memory after electrical system surges
• Mechanical timing problems such as stretched timing chain or jumped timing (rare but possible on high-hour machines)
• Contaminated sensor air gap from metal debris, oil buildup, or dirt accumulation affecting magnetic field

How to Troubleshoot and Fix Code 000655.13

Step 1: Connect Diagnostic Software Use John Deere Service Advisor or compatible diagnostic tool to verify the active fault code and check freeze frame data. Record the engine hours, operating conditions when the fault occurred, and whether it's an active or historical code.

Step 2: Inspect Engine Speed Sensors Locate the crankshaft position sensor (typically on the lower left side of the engine block near the flywheel) and camshaft position sensor (on the front timing cover). Inspect connectors for corrosion, bent pins, or moisture intrusion—extremely common on used excavators operating in wet conditions. Check sensor mounting bolts for proper torque (typically 8-10 Nm).

Step 3: Test Sensor Resistance and Air Gap Disconnect each sensor and measure resistance using a digital multimeter. Specification is typically 200-1,000 ohms (consult service manual for exact values). Verify the air gap between sensor tip and reluctor ring is within 0.5-1.5mm using feeler gauges. Any metal debris on the sensor tip indicates contamination issues.

Step 4: Check Wiring Harness Continuity Trace the sensor wiring harness from sensor to ECM connector, looking for rub points against frame rails, engine mounts, or starter motor—known wear areas on the E240LC. Perform continuity and insulation resistance tests (should exceed 10 megohms to ground).

Step 5: Inspect Mechanical Components If sensors and wiring test good, inspect the reluctor ring on the crankshaft for damaged teeth, cracks, or excessive runout. This requires removing the starter motor for visual access. On high-hour used machines, verify timing chain tension and condition.

Step 6: Clear Code and Test After repairs, clear the fault code using diagnostic software and operate the machine through various RPM ranges and load conditions for at least 30 minutes to verify the repair.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official John Deere service manual for your specific serial number range and torque specifications. If you're unfamiliar with high-pressure fuel systems or electronic diagnostics, seek assistance from a certified John Deere technician to avoid safety hazards or further damage.