Resistance Inspection

Switch the ignition to LOCK.
Disconnect the KS connector.
Measure the resistance between the KS terminals A and B using an ohmmeter.
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [L5] .)
  Specification
  
  Approx. 4.63-5.11 megohms [ECT: 25 °C {77 °F}]
  
  Fig 1: Identifying Knock Sensor Connector Terminals
  Courtesy of MAZDA MOTORS CORP.