Resistance Check

Using an ohmmeter, check resistance of primary coil. Connect one lead of ohmmeter to positive (+) terminal and other lead to each negative (-) terminal. If not within specification, replace coil. Remember that unit has two coil assemblies, so both must be checked.
Primary coil resistance:

0.45~0.55 ohm @ 68°F (20°C)

Fig 1: Testing Primary Coil Resistance
Courtesy of KIA MOTORS AMERICA, INC.
Using an ohmmeter, check resistance of the secondary coil. If not within specification, replace coil. Remember that you must check resistance of both top and bottom secondary coil. If one is out of specification replace the whole unit.
Secondary coil resistance:

10.9~13.3Ω @ 68°F (20°C)

Fig 2: Testing Secondary Coil Resistance
Courtesy of KIA MOTORS AMERICA, INC.