Resistance Inspection

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
Remove the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
Measure the resistance between KS terminals A and B.

Courtesy of MAZDA MOTORS CORP.
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
  Specification
  
  504-616 kilohms [-40-130 °C {-40-266 °F}]