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. ...

Ignition Coil. Specifications

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