Resistance Inspection

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [VIN L (WITHOUT CYLINDER DEACTIVATION)] .)
Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [VIN L (WITHOUT CYLINDER DEACTIVATION)] .)
Disconnect the KS connector.
Remove the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [VIN L (WITHOUT CYLINDER DEACTIVATION)] .)
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 [VIN L (WITHOUT CYLINDER DEACTIVATION)] .)
  Specification
  
  504-616 kilohms [10-30°C {50-86°F}]