Oscilloscope Patterns and Waveforms

MEASUREMENT METHOD
1. Clamp the spark plug cable (Number 1 or 3) with the secondary pickup.

NOTE: 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 (Number 1 or 3) with the spark plug cable which has been clamped by the secondary pickup.

NOTE: Identification of which cylinder wave pattern is displayed can be difficult, but the wave pattern of the cylinder which is clamped by the secondary pickup will be stable, so this can be used as a reference.

2. Clamp the spark plug cable (Number 1 or 3) with the trigger pickup.

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

Observation Conditions:

Observation Conditions:

STANDARD WAVE PATTERN

WAVEFORM OBSERVATION POINTS

NOTE: Abnormal waveform examples are shown subsequently.




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 (distribution per each cylinder) shows the following trends.

Abnormal Waveform Examples: