Knock Sensor Inspection

WARNING: This page is about a different car, the 2010 Suzuki Kizashi. However, it is still accessible from the selected car via links, so may be relevant.

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.