Oscilloscope Patterns and Waveforms

INSPECTION USING OSCILLOSCOPE



- With the engine racing (4,000 rpm) measure between terminals KNK1, KNK2 of ECM and body ground.
HINT: The correct waveform is as shown.




- Spread the time on the horizontal axis, and confirm that period of the wave is 151 microseconds (Normal mode vibration frequency of knock sensor: 6.6 kHz).
HINT: If normal mode vibration frequency is not 6.6 kHz, the sensor is malfunctioning.