Knock Control Test Pulse - Signal Implausible: Function

The knock control system is designed to detect knocking combustion and to retard the ignition timing for the knocking cylinder(s). When no further knocking occurs, the ignition timing is advanced again gradually to the specified value. Because of the engine design (opposed-cylinder engine), two knock sensors are needed.

Knock sensor 1 - cylinder 1 to 3

Knock sensor 2 - cylinders 4 to 6