Knocking is a phenomenon characterized by undesirable vibration and noise that can cause engine damage. A knock sensor (KS) is mounted on the cylinder block and senses engine knocking. A knocking vibration from the cylinder block is applied as pressure to the piezoelectric element. A knock sensor (KS) detects vibration when RPM rises or drops and generates voltages based on this vibration. The PCM controls the ignition timing based on the amplitude and frequency of the knock sensor signal. For example, if engine knocking occurs, the ignition timing is retarded to prevent it.
If normalized reference signal is less than the lower limit based on RPM , P0327 is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Signal check | ● Poor connection ● Open or short to ground in signal circuit ● Knock sensor |
Enable Conditions | ● Engine speed > 2600rpm | |
Threshold Value | ● Normalized reference level < lower limit, f(rpm) | |
Diagnostic Time | ● Continuous | |
MIL ON Condition | ● DTC only |
Item | Specification |
Capacitance | 950~1,350pF |
