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 the number of knock sensor errors is over 25 times, PCM sets P0326.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Rationality check
? Poor connection
? Open or short in signal circuit
? Knock sensor
? PCM
Enable Conditions
Threshold Value
? Number of knock sensor errors > 25
Diagnostic Time
? Continuous
MIL ON Condition
? DTC only
Specification
Capacitance
950~1,350pF