On Board Diagnostic
P1386
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 more
knocking combustion 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.
Diagnosis conditions
P1384
- Speed between 800 and 4760 rpm
P1385 and P1386
- Engine running
P1384 - P1386
NOTE: When a fault is stored, the ignition angle is retarded for all cylinders in the range in which knock control is active.