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.
Knock sensor signal is inputted to CPU through SPI(Serial Port Interface). By the way, if there is malfunction between SPI and CPU, PCM sets DTC P1560.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● SPI communication check | ● Poor connection ● PCM |
Enable Conditions | ||
Threshold Value | ● Number of SPI errors ＞1 | |
Diagnostic Time | ● Continuous |
SPI : Serial Port Interface
Item | Specification |
Capacitance | 950~1,350pF |
