Preconditions for the test:
Engine running.
No faults stored.
Engine temperature above 80 °C.
Note:
For testing knock sensors.
The tests are done during a test drive.
Procedure:
Choose the function: Knock regulation.
Keep the engine speed above 2200 rpm and load the motor with more than 15 %.
The diagnostic status field changes from ”Test off” to ”Test on”.
Vary the engine speed between 2200 and 5700 rpm and load the engine by 15-100 %, until the diagnostic status field changes to ”Sys. OK/ Sys. not OK!”.