Resistance Inspection

Measure the resistance of the spark plug using a ohmmeter as shown in the figure.

Fig 1: Measuring Resistance Of Spark Plug Using Ohmmeter
Courtesy of MAZDA MOTORS CORP.
- If not within specification, replace the spark plug.
  Spark plug resistance [25°C {77 °F}]
  
  3.0-7.5 kilohms