Knock Sensor: Spectra

Remove knock sensor from engine. Mount knock sensor in jaws of bench vise. Connect voltmeter between knock sensor connector terminals No. 1 and 2. See Fig 1. Using hammer, sharply rap on bench vise and check for voltage spike (less than one volt). If no voltage spike is observed, replace knock sensor.

Fig 1: Identifying Knock Sensor Connectors & Terminals

Courtesy of KIA MOTORS AMERICA, INC.