Oscilloscope Patterns and Waveforms

MEASUREMENT METHOD
1. Clamp the spark plug cable (No.1 No.3 or No.5) with the secondary pick-up.

NOTE:
1. Because of the two-cylinder simultaneous ignition system, the waves for two cylinders in each group appear during wave observation. However, wave observation is carried out for the cylinder (No.1, No.3 or No.5) with the spark plug cable which has been clamped by the secondary pick-up.
2. Identification of which cylinder waveform is displayed can be difficult, but the waveform of the cylinder which is clamped by the secondary pick-up will be stable, so this can be used as a reference for identification.

2. Clamp the spark plug cable (No.1, No.3 or No.5) with the trigger pick-up.

NOTE: Clamp the same spark plug cable as the one which has been clamped by the secondary pick-up.

STANDARD WAVEFORM




Observation conditions




Observation conditions (Only PATTERN SELECTOR below changes from the above conditions.)

WAVEFORM OBSERVATION POINTS




(Point A): The height, length and slope of the spark line (refer to Abnormal Waveform Examples 1, 2, 3 and 4) show the following trends.




(Point B): Number of vibrations in reduction vibration section (Refer to Abnormal Waveform Example 5.)




(Point C): Number of vibrations at beginning of dwell section (Refer to Abnormal Waveform Example 5.)




(Point D): Ignition voltage height (deviation per each cylinder) shows the following trends.





ABNORMAL WAVEFORMS EXAMPLES