Knock Sensor Inspection

With ignition mode of keyless push start system in "OFF", disconnect connector (2) from knock sensor.
Connect oscilloscope (1) as shown in figure.

Fig 1: Identifying Knock Sensor Connector Terminals
Courtesy of SUZUKI OF AMERICA CORP.
Check that knock sensor signal (1) shows the following waveform when plastic hammer inflicts a strong impact on the cylinder block.
If faulty condition is found, replace knock sensor, see KNOCK SENSOR REMOVAL AND INSTALLATION .

Fig 2: Knock Sensor Signal Waveform Graph
Courtesy of SUZUKI OF AMERICA CORP.