Knocking is a phenomenon characterized by undesirable vibration and noise and can cause engine damage. The knock sensor (KS) is attached to the cylinder block and senses engine knocking. A knocking vibration from the cylinder block is applied as pressure to the piezoelectric element. The knock sensor (KS) detects vibration upon increase and decrease in engine RPM and generates a voltage 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 suppress it.
This DTC is set if there is little change in knock sensor’s signal.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Signal at current segment is compared to previouse one
? Poor connection
? Open or short in knock sensor circuit
? Faulty knock sensor
? Defective PCM
Enable Conditions
? Time after start > 2sec
? Engine speed =2500rpm
? Load value =30%
Threshold value
? Amount of change IVp(t)-Vp(t-1)I < 0.06V
? Counter that above condition is fulfilled =200times
Diagnostic Time
? Continuous
MIL ON condition
? No MIL ON