NGK U5112-49085 Ignition Coil 49085 Pencil Coil [1-output type]

【NGK U5112-49085 Ignition Coil 49085 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 the space between these components is filled with epoxy resin in the case to ensure insulation.

Specifications
Principle of High Voltage Generation in Ignition Coils
While there are various types of ignition coils, differing in appearance and number of output terminals, their high-voltage generation principle is the same. 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 lines of force called magnetic flux in the core (iron core), which is 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) 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 turns ratio of the primary and secondary coils. The high voltage generated in the secondary coil causes a spark to jump across the spark plug gap, igniting the air-fuel mixture (gasoline + air).
*A coil has the property of generating voltage when the magnetic flux passing through it changes. This voltage generation phenomenon is called electromagnetic induction.
Since the voltage generated in a coil increases in proportion to the number of turns, ignition coils increase the winding of the secondary coil to generate high voltage.
Type: Pencil Coil [1-Output Type]
Ignition coils are installed directly on each spark plug, eliminating the need for plug wires. This is currently the most commonly adopted type by automotive manufacturers.
Compatible Manufacturer: Nissan
Compatible Genuine Part Number: 22448-8J11C
Compatible Models: Elgrand 2500 (ME51/MNE51) [2004/12～2010/8]/3500 (APE50/APWE50/E51/NE51) [2001/7～2002/5, 2002/5～2006/12]｜Teana 2300 (J31) [2003/2～2008/6]/3500 (PJ31) [2003/2～2008/6]*ASSY｜Presage (PNU31/PU31) [2003/7～2006/6]｜Murano (PNZ50/PZ50) [2004/9～2015/4]

■Notes on images
*Images are for illustration purposes only. Includes products with different sizes and colors. Product designs and specifications are subject to change without notice. Please understand.

■Precautions
1. Always stop the engine before inspecting or replacing parts.
2. Please check for any oil adhesion or leaks around the plug holes. Oil adhesion or leaks can cause malfunctions.
3. Perform inspection and replacement according to the service manual of each automobile manufacturer.
4. Please be careful when attaching and detaching connectors. Damaging the connector part can lead to poor conductivity.
5. Do not use products that have been dropped, as dropping or impacting them may cause cracks or damage to internal components.
6. Use the correct part number of ignition coil specified in this document.
7. Do not use the ignition coil mentioned in this document for purposes 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 codes according to the service manual or similar. Failure to clear the error codes may lead to problems such as the engine check lamp not turning off.