NGK U5170-48546 Ignition Coil 48546 Pencil Coil [Single Output Type]

【NGK U5170-48546 Ignition Coil 48546 Pencil Coil [1-output type]】
■Product Description
Role of Ignition Coils
In an internal combustion engine that uses spark plugs, a high voltage of 20,000 to 35,000V is required to discharge electricity in the combustion chamber during the compression stroke. An ignition coil is a type of transformer that converts the 12V battery voltage into the high voltage necessary for spark plug discharge. It generally consists of a primary coil, a secondary coil, and a core (iron core), and epoxy resin is filled into the case to ensure insulation between these parts.

Specifications
Principle of High Voltage Generation in Ignition Coils
While there are various types of ignition coils, differing in appearance, number of output terminals, etc., the principle of high voltage generation is the same for all. The primary coil is connected to the battery via an igniter (switch). First, the ECU (engine control unit) turns the igniter ON, allowing current to flow through the primary coil. This generates a bundle of magnetic field lines called magnetic flux in the core (iron core) that acts as the axis of the primary coil, turning the core (iron core) into an electromagnet. Subsequently, when the ECU determines the engine ignition timing, it switches the igniter to the OFF state, stopping the current to the primary coil. As a result, the core (iron core) is no longer an electromagnet, and the magnetic flux inside the core (iron core) disappears. When the magnetic flux inside the core (iron core) suddenly disappears, a high voltage is generated in the secondary coil, which shares the same core (iron core) as its axis, due to electromagnetic induction*, in proportion to the winding ratio of the primary and secondary coils. The high voltage generated in the secondary coil causes a spark to jump across the gap of the spark plug, igniting the air-fuel mixture (gasoline + air).
*A coil has the property of generating voltage when the magnetic flux passing through it changes. This phenomenon of voltage generation is called electromagnetic induction.
Since the voltage generated in a coil increases in proportion to the number of windings, ignition coils increase the windings of the secondary coil to generate high voltage.
Type: Pencil Coil [1-output type]
Ignition coils are mounted directly on each spark plug, eliminating the need for plug wires. This type is currently the most commonly adopted by automotive manufacturers.
Compatible Genuine Part Number: 19500-B2040

■Image Disclaimer
*Images are for illustration purposes only. They may include products of different sizes or colors. Product design and specifications are subject to change without notice. Please be aware of this.

■Precautions
1. Always turn off the engine before inspection or replacement.
2. Please check for any oil adherence or leakage around the plug hole. Oil adherence or leakage can cause malfunction.
3. Perform inspection and replacement according to the service manual of each car manufacturer.
4. Please handle connectors carefully when attaching or detaching them. Damage to the connector part can lead to poor conductivity.
5. Do not use dropped products as dropping or impacting them may cause cracks or damage to internal components.
6. Please use the correct part number ignition coil as specified in this document.
7. Do not use the ignition coil mentioned in this document for any purpose other than its intended use.
8. When storing, avoid high temperatures and humidity.
9. When the engine check (MIL) lamp illuminates, before (or after) replacing the ignition coil, always clear (reset) the diagnostic (self-diagnosis/OBD) error code according to the service manual or similar documentation. Failure to clear the error code may lead to issues such as the engine check lamp not turning off.