Pic. 2.257. Knock sensor
Pic. 2.258. Connection diagram of the knock sensor with the ECU
Conditions for storing fault codes
The ECU memorizes a fault code (the control lamp of malfunction of a control system of the engine does not light up), if, in two driving cycles, the knock sensor signal voltage drops below 650 mV for 4 seconds under the following conditions:
- the starter does not work;
- crankshaft speed above 3000 min-1;
- coolant temperature above 40°C;
- motor load is greater than 2.5 ms.
The output of this code indicates the detection of unusual ECU vibration from the signals of the knock sensor during normal engine operation.