Hyundai Sonata: 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.
Repair procedures
On-vehicle Inspection Inspect ignition coil assembly and Perform spark test 1. Check for DTCs.     • If a DTC is present, perform troubleshooting in accordance with the ...

Ignition Coil Specifications
Specification ItemSpecification Primary Coil Resistance (?)0.56 ± 10% [20°C (68°F)]Secondary Coil Resistance (k?)2.0 ± 15% [20°C (68°F)] ...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: General Service Information
General Information Protection Of The Vehicle Always be sure to cover fenders, seats, and floor areas before starting work.     The support rod must be inserted into the hole near the edge of the hood whenever you inspect the engine compartment to prevent the hood from fal ...

Hyundai Sonata LF 2014-2019 Service Manual: Troubleshooting
Troubleshooting Ignition System SymptomSuspect AreaRemedyEngine will not start or is hard to start (Cranks OK)Ignition lock switchInspect ignition lock switch, or replace as requiredIgnition coilInspect ignition coil, or replace as requiredSpark plugsInspect spark plugs, or replace as requir ...

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