Mazda CX-9 Grand Touring 2009 Manual page 1810

2008 ENGINE PERFORMANCE Ignition System (MZI-3.7) - Mazda CX-9
Fig. 4: Identifying Spark Plug Damage And Breakage
Courtesy of MAZDA MOTORS CORP.
RESISTANCE INSPECTION
1. Measure the resistance of the spark plug using a tester as shown in the figure.
If not within the specification, replace the spark plug.
Spark plug resistance
2-20 kilohms
Fig. 5: Measuring Resistance Of Spark Plug With Tester
Courtesy of MAZDA MOTORS CORP.
2008 Mazda CX-9 Grand Touring