Knock Sensor Inspection

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

Reference: KNOCK SENSOR REMOVAL AND INSTALLATION

Disconnect connector (2) from knock sensor.
Connect oscilloscope (1) as shown in figure.

Fig 1: Checking Knock Sensor
Courtesy of SUZUKI OF AMERICA CORP.
Check that knock sensor signal (1) shows the following waveform when cylinder block is given a shock by plastic hammer.
If faulty condition is found, replace knock sensor.

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