Hyundai Elantra (CN7): Ignition System / Ignition Coil

Hyundai Elantra (CN7) 2021-2026 Service 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 12V supply.

Troubleshooting

Connector assembly status test

1.	Remove the connector (A) and reinstall it.

Test for changing position of each ignition coil

A : Ignition coil w/ misfire code

B : Ignition coil w/o misfire code

•	Do not move with spark plug at the same time (move the ignition coil only)

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.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

2.	Remove the engine cover.

Disconnect the ignition coil connector (A).

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

Remove the ignition coil (A).

Ignition coil installation bolts :

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

Measure the primary coil resistance between terminals 1 and 2.

Standard value : 0.75Ω ± 15%

❮Repair procedures

On-vehicle InspectionInspect ignition coil assembly and Perform spark test1.Check for DTCs. • If a DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

Spark Plug❯

Description and operation DescriptionA spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture therein by means of an electric spark, while containing combustion pressure within the engine.

Other information:

Hyundai Elantra (CN7) 2021-2026 Service Manual: Specification

Hyundai Elantra (CN7) 2021-2026 Service Manual: In-car Sensor

Description and operation DescriptionThe In-car air temperature sensor is built in the heater & A/C control unit.The sensor contains a thermistor which measures the temperature of the inside. The signal decided by the resistance value which changes in accordance with perceived inside temperature, is delivered to heater control unit and accor