What is John Deere E240LC Fault Code 000656.13?

Fault Code 000656.13 indicates an "Engine Speed/Position Sensor Circuit - Out of Range High" condition on the John Deere E240LC excavator. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an abnormally high voltage signal from the crankshaft position sensor or camshaft position sensor circuit, exceeding the manufacturer's predetermined threshold.

This fault directly impacts the ECM's ability to accurately calculate engine timing, fuel injection sequencing, and overall engine management. The speed/position sensors are critical for proper diesel engine operation, as they provide real-time data about crankshaft rotation and piston position. When this code appears on a used E240LC, it typically indicates sensor degradation, wiring issues, or ECM communication problems that have developed over thousands of operating hours.

Common Symptoms

When fault code 000656.13 is active, operators may experience:

• Hard starting or complete no-start condition due to incorrect timing calculations
• Engine Control Module warning lamp illuminated on the instrument cluster
• Rough idling, misfiring, or erratic engine performance during operation
• Sudden engine stalling at idle or under load conditions
• Power derate mode or engine speed limitation to protect components

Potential Causes

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

• Damaged or worn crankshaft/camshaft position sensor with internal circuit failure causing high resistance
• Corroded or loose connector pins at the sensor harness connection point
• Chafed or damaged sensor wiring harness particularly where cables route near engine mounts or vibrating components
• Contaminated sensor face covered with metallic debris or oil buildup affecting magnetic field detection
• Failed ECM internal circuitry providing incorrect reference voltage to the sensor
• Aftermarket or incorrect sensor replacement with improper electrical specifications
• Damaged reluctor ring/tone wheel on the crankshaft causing erratic signal generation

How to Troubleshoot and Fix Code 000656.13

Step 1: Visual Inspection Begin by thoroughly inspecting the crankshaft position sensor and wiring harness for obvious damage. On used excavators, check for harness routing issues where cables may rub against the engine block, starter motor housing, or hydraulic lines. Inspect connector terminals for corrosion, bent pins, or moisture intrusion.

Step 2: Sensor and Circuit Testing Using a digital multimeter, measure the sensor resistance (typically 200-1000 ohms for magnetic sensors) and compare against John Deere specifications. Disconnect the sensor and check supply voltage at the ECM connector (should read approximately 5V or 8V reference). Test circuit continuity and look for short circuits to power that would cause the high voltage reading.

Step 3: Signal Output Verification With the sensor connected, use John Deere Service Advisor software or compatible diagnostic tool to monitor live sensor data during cranking. The signal should show consistent AC voltage pulses. Clean the sensor face and check the air gap between sensor tip and reluctor ring (typically 0.020"-0.050").

Step 4: Component Replacement If testing confirms sensor failure, replace with genuine John Deere parts to ensure proper electrical specifications. Before installing new components on used equipment, clean mounting surfaces, apply dielectric grease to connectors, and secure harnesses away from heat and friction points.

---

Disclaimer: This guide provides general troubleshooting information. Always consult the John Deere service manual for your specific serial number and seek professional diagnostic assistance when working with complex electronic systems. Improper repairs may cause additional damage or safety hazards.