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 ECM 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 less than the lower limit or the upper limit, ECM sets P0326.
Item | Detecting Condition | Possible Cause | |
Case1 | DTC Strategy |
•
Signal check | 1. Poor connection 2. Open or short in signal circuit 3. Knock sensor |
Enable Conditions |
•
Engine speed > 2440rpm
•
Knock control condition - active | ||
Threshold Value |
•
Number of knock sensor errors > upper limit or Number of knock sensor errors < lower limit | ||
Case2 | DTC Strategy |
•
Line check | |
Enable Conditions |
•
Knock control condition - not active | ||
Threshold Value |
•
Short circuit to GND or battery | ||
Diagnostic Time |
•
Continuous | ||
MIL ON Condition |
•
DTC only | ||
