Ignition Secondary Voltage Wave Pattern Check

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