Resistance Inspection

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable.
Disconnect the KS connector.
Measure the resistance between KS terminals A and B using an ohmmeter.
- If the KS is okay, but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
  
  Fig 1: Identifying Knock Sensor Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
Specification

Approx. 4.87 megohms (20°C {68°F})