Turn off the ignition and disconnect the battery negative terminal
Locate the ignition coil and disconnect its electrical connector
Remove the coil if needed for easier access
Set the multimeter to ohms for resistance testing
Measure primary resistance between the coil’s positive and negative terminals
Compare the reading with the manufacturer’s specification
Measure secondary resistance between the coil output terminal and the positive or negative terminal as specified by the coil type
Compare the secondary resistance reading with the manufacturer’s specification
Check for continuity between the coil terminals and ground if required by the service manual
Inspect for open circuit readings, short circuit readings, or readings far outside specification
Reconnect the coil and set the multimeter to DC volts
Turn the ignition to the ON position
Check for battery voltage at the coil power terminal
Check the trigger signal at the coil control terminal while cranking the engine
Replace the coil if resistance, voltage, or trigger signal readings are incorrect
Reinstall all connectors and reconnect the battery after testing