Resistance Inspection

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Disconnect the KS connector.
Remove the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
Measure the resistance between KS terminals A and B.
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
  Specification
  
  504-616 kilohms [10-30 °C {50-86 °F}]
  
  Fig 1: Locating KS Connector Terminal
  Courtesy of MAZDA MOTORS CORP.