Resistance Inspection

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

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}]