Knock Sensor: Description and Operation

Knock Sensor

Description

The Knock Sensor interface consists of 4 input signal and 4 screen grounds.
There are four knock sensor diagnostic checks, a fault is detected if:-
1. The engine speed is greater than 2200 RPM, the ECT is greater than 40.5 degree C and the input voltage exceeds a minimum voltage threshold.
2. The engine speed is greater than 2200 RPM, the ECT is greater than 40.5 degree C and the input voltage exceeds a maximum voltage threshold.
3. The engine speed is less than 5400 RPM, the ECT is greater than 40 degree C and no knock sensor signal has been received.
4. The engine speed is less than 5400 RPM, the ECT is greater than 40 degree C and the knock signal has deviated from the test signal.