Resistance Inspection

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION ).
Remove the following parts:
1. Seal cover (See SEAL COVER REMOVAL/INSTALLATION ).
2. Front suspension tower bar (Vehicles with front suspension tower bar) (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION ).
3. Intake manifold (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION ).
Disconnect the KS connector.
Remove the bolt. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION ).
Remove the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION ).
Measure the resistance between KS terminals A and B.

Fig 1: Identifying KS Connector Terminals
Courtesy of MAZDA MOTORS CORP.
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION ).
  Specification (Reference)
  
  504-616 kilohms [10-30 °C {50-86 °F}]