Kia Optima: Ignition System / Ignition Coil

Kia Optima DL3 2019-2021 Service and Repair Manual / Engine Electrical System / Ignition System / Ignition Coil

Description and operation
Description

An ignition coil is an induction coil in an engine's ignition system which transforms the battery's low voltage to the high voltage needed to create an electric spark in the spark plugs to ignite the fuel. Coils have an internal resistor while others rely on a resistor wire or an external resistor to limit the current flowing into the coil from the battery 12 V supply.

Specifications
Specification

Item
Specification
Primary Coil Resistance (Ω)
0.75 ± 15% [20°C (68°F)]
Secondary Coil Resistance (kΩ)
5.9 ± 15% [20°C (68°F)]

Schematic diagrams
Circuit Diagram

Repair procedures
Removal
1.

Disconnect the negative battery (-) terminal.

2.

Remove the engine cover.

3.

Disconnect the ignition coil connector (A).

  

When removing the ignition coil connector, pull the lock pin (A) and push the clip (B).

4.

Remove the ignition coil (A).

Tightening torque :

9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 Ib-ft)

Installation
1.

Install in the reverse order of removal.

Inspection
1.

Measure the primary coil resistance between terminals 1 and 2.

Standard value : 0.75Ω ± 15%

Ignition System
Description and operation Description Ignition timing is controlled by the electronic control ignition timing system. The standard reference ignition timing data for the engine operat ...

Spark Plug
Description and operation Description A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite th ...

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