Hyundai Elantra Owners and Service Manuals

Hyundai Elantra: Ignition System / Ignition Coil

Hyundai Elantra (CN7) 2021-2025 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
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.
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).
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
1.
Measure the primary coil resistance between terminals 1 and 2.

Standard value : 0.75Ω ± 15%

    Repair procedures

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