Knock Sensor

The knock sensor monitors the combustion process in the engine. Its signal helps the engine control unit prevent knocking combustion, thereby protecting the mechanical components of the engine.

Knock sensor location
Typical location of the knock sensor
Knock sensor connection
Connection of the USB Autoscope IV to the sensor signal wire
Setting the USB Autoscope IV to 1-channel mode
Setting the USB Autoscope IV to 1-channel mode
Output voltage waveform of the knock sensor in good condition on Mitsubishi Chariot 4G64
Output voltage waveform of the knock sensor in good condition on Mitsubishi Chariot 4G64, recorded while the engine was at idle
Output voltage waveform of the knock sensor in good condition on Mazda 3 1.6 Z6
Output voltage waveform of the knock sensor in good condition on Mazda 3 1.6 Z6
Output voltage waveform of the knock sensor with a malfunction on Mazda 3 1.6 Z6
Output voltage waveform of the knock sensor with a malfunction on Mazda 3 1.6 Z6

Waveform examples