Hyundai i20 2018 Crankshaft Position Sensor: A Comprehensive Guide

High-Quality Hyundai i20 2018 Crankshaft Position Sensor (Part # 3918003200) – Genuine MOBIS/GENUINE, Korea

The crankshaft position sensor (CPS) is a vital engine component. Its primary function is to precisely track the crankshaft’s rotational speed and position. This data is transmitted to the engine control unit (ECU), which uses it to optimize ignition timing and fuel injection. The CPS achieves this by leveraging the magnetic field fluctuations generated as the crankshaft’s toothed wheel rotates. These fluctuations produce an alternating current (AC) signal, providing the ECU with the information it needs for accurate engine management. The sensor’s core components include an inductor coil, a permanent magnet, and a rotor with a tooth count specific to the engine type. Typical mounting locations include near the crankshaft pulley, above the flywheel, or directly on the crankshaft. The sensor’s wiring varies; some models utilize two wires, others three. During installation, a torque of 10 N.m is crucial. A correctly functioning sensor typically exhibits a resistance between 200 and 500 ohms and a voltage between 0.2 and 2 volts.

Understanding the Magnetic Crankshaft Position Sensor

Magnetic CPS units comprise an electromagnetic coil, a permanent magnet, and a pulse ring. Additional components include the sensor housing, signal output wire, protective wire sheath, magnetic teeth, and an air gap. The sensor’s placement on the flywheel allows for precise crankshaft speed measurement. As the piston moves, the crankshaft rotates, triggering pulse signals sent to the ECU. Using a pre-programmed algorithm, the ECU counts these pulses to calculate crankshaft speed. While magnetic sensors produce sinusoidal waveforms, Hall effect and optical sensors generate square waves. Regular maintenance is essential for smooth engine operation. Neglecting this can lead to premature part failure.

Troubleshooting a Faulty Crankshaft Position Sensor

A malfunctioning CPS significantly impacts vehicle performance. Inaccurate signals disrupt the ECU’s ability to regulate engine speed, resulting in sluggish or inconsistent acceleration. Idle roughness, often due to misfires from incorrect ignition timing, is another common symptom. The compromised information also affects fuel injection, leading to increased fuel consumption. A check engine light often illuminates when the sensor fails.

Vehicle Compatibility

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