NGK U5168-48544 Ignition Coil 48544 Pencil Coil [1-Output Type]

【NGK U5168-48544 Ignition Coil 48544 Pencil Coil [1-Output Type]】
■Product Description
Role of the Ignition Coil
In an internal combustion engine using 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 required for spark plug discharge. It basically 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
High Voltage Generation Principle of Ignition Coils
While there are various types of ignition coils, differing in external shape and the number of output terminals, the high voltage generation principle 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 into the primary coil. This generates a bundle of magnetic lines of force called magnetic flux in the core (iron core) that acts as the axis of the primary coil, making the core (iron core) an electromagnet. Then, 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) ceases to be an electromagnet, and the magnetic flux inside the core (iron core) also 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 turns 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, initiating the combustion of 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 turns, ignition coils increase the number of turns in 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 is currently the most commonly adopted type by automotive manufacturers.
Compatible Genuine Part Number: 22448-AA100

■Notes on Images
*Images are for illustrative purposes only. They may include products of different sizes or colors. Product designs and specifications are subject to change without notice. Thank you for your understanding.

■Precautions
1. Always stop the engine before performing inspection or replacement.
2. Please check for any oil adhesion or leaks around the spark plug hole. Oil adhesion or leaks can cause malfunction.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Please handle connectors carefully when attaching and detaching them. Damage to the connector part can lead to poor electrical continuity.
5. Do not use products that have been dropped, as dropping or impacting them may cause cracks or damage to internal components.
6. Please use the ignition coil with the correct part number as stated in this document.
7. Do not use the ignition coil described in this document for any purpose other than its intended use.
8. When storing, avoid high temperatures and high 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.