Oscilloscope Patterns and Waveforms

MEASUREMENT METHOD
1. Clamp the SECONDARY PICKUP around the spark plug cable.

NOTE:
1. The peak ignition voltage will be reversed when the spark cables No.2 and No.4, or No.1 and No.3 cylinders are clamped.
2. Because of the two-cylinder simultaneous ignition system, the waveforms for two cylinders in each group appear during wave form observation (No.1 cylinder - No.4 cylinder, No.2 cylinder - No.3 cylinder).

However, wave form observation is only applicable for the cylinder with the spark plug cable clamped by the secondary pickup

3. Identifying which cylinder waveform pattern is displayed can be difficult. For reference, remember that the wave form pattern of the cylinder attached to the secondary pickup will be displayed as stable.

2. Clamp the spark plug cable with the Trigger pickup.

NOTE: Clamp the trigger pickup to the same spark plug cable clamped by the secondary pickup.

STANDARD WAVEFORM

Observation Conditions:

Waveform:

Observation Conditions

Observation Condition (The Only Change From Above Condition Is The Pattern Selector:

Observation Condition (The only change from above condition is the pattern selector.)

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 vibration 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 Waveforms Examples: