General Information

P1550 Knock sensor evaluation IC

General Information

Component Location





General Description

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.

DTC Description

If the knock sensor signal is outside the acceptable parameters, P1550 is set.

DTC Detecting Condition





Specification





Schematic Diagram





Signal Waveform