What is Hyundai HX220 NL EPFC Fault Code 1713 (3363-16)?

Fault Code 1713 (SPN 3363-16) indicates an abnormal voltage condition detected in the Engine Speed/Position Sensor Circuit, specifically registering a "Moderately Severe Level" electrical fault. This diagnostic trouble code (DTC) is generated when the Engine Control Module (ECM) detects voltage readings from the crankshaft position sensor or camshaft position sensor that fall outside acceptable parameters—typically due to short circuits, open circuits, or intermittent signal interruptions.

In the Hyundai HX220 NL excavator equipped with the electronic fuel injection system, this sensor provides critical timing data to the ECM for proper fuel injection sequencing and ignition timing. When this circuit malfunctions, the engine management system cannot accurately determine crankshaft rotation speed or position, directly compromising engine performance, fuel efficiency, and potentially causing the machine to enter a protective derate mode or fail to start entirely.

Common Symptoms

• Engine cranks but fails to start or experiences extended cranking before starting
• Check Engine light (MIL) illuminated on the instrument cluster with stored fault code
• Rough idle, misfiring, or erratic engine RPM fluctuations during operation
• Sudden engine stalling during low-load conditions or at idle
• Loss of power or engine derate mode activated, limiting maximum RPM and hydraulic performance

Potential Causes

The most frequent causes of Code 1713 in used Hyundai HX220 excavators include:

• Damaged or corroded wiring harness near the engine block where vibration and heat cause insulation breakdown
• Faulty crankshaft position sensor due to internal coil failure or magnetic reluctor wheel contamination
• Connector corrosion or moisture intrusion at the sensor plug, especially common in machines with high hour meters
• Worn or damaged reluctor ring on the crankshaft/camshaft causing inconsistent signal generation
• ECM internal fault or poor ground connections affecting sensor voltage supply
• Aftermarket repair quality issues where previous harness repairs used inadequate wire gauge or improper shielding

How to Troubleshoot and Fix Code 1713 (3363-16)

Step 1: Visual Inspection Begin by inspecting the engine speed sensor harness from the sensor to the ECM connector. On used excavators, check for harness abrasion points where wires contact the engine block, particularly near the timing cover. Look for melted insulation, pinched wires, or corroded connectors.

Step 2: Electrical Testing Using a digital multimeter (DMM), measure sensor resistance (typically 200-1000 ohms depending on sensor type) and check for 5-volt reference supply from the ECM at the sensor connector with ignition on, engine off. Verify ground circuit continuity (should read less than 1 ohm resistance to chassis ground).

Step 3: Signal Testing With a diagnostic laptop running Hyundai Hi-MATE or compatible software, monitor live sensor signal voltage while cranking. The signal should show AC voltage fluctuation (typically 0.5-5V) with consistent frequency. Erratic or absent signals indicate sensor replacement is necessary.

Step 4: Component Replacement If testing confirms sensor failure, replace with OEM-quality crankshaft position sensor and apply dielectric grease to connector terminals. For used machines, always replace the connector pigtail if corrosion is present rather than attempting to clean contacts.

Step 5: Clear Codes and Verify After repairs, clear fault codes using diagnostic software, perform a complete engine operating cycle, and re-scan to confirm the code does not return.

---

Disclaimer: This guide provides general troubleshooting information. Always consult the official Hyundai service manual for your specific machine serial number and consider professional diagnostic services for complex electrical issues. Improper repairs may cause additional damage or safety hazards.