Oscilloscope Patterns and Waveforms

IGNITION PRIMARY VOLTAGE WAVEFORM CHECK
1. Disconnect the ignition coil connector and connect the special tool (harness connector: MD998478) in between.
2. Connect the analyzer primary pickup to the ignition coil connector terminal 1 (black clip on the special tool) when observing the No.2 - No.3 cylinder group, terminal 2 (red clip) for the No.1 - No.4 cylinder group.
3. Connect the primary pickup earth terminal.
4. Clamp the spark plug with the trigger pickup.

NOTE:
1. Clamp the spark plug cable for No.1 and No.3 cylinders of the same group with the cylinder that is connected to the primary pickup.
2. The wave pattern of either cylinder in the same group will appear at the left edge of the screen.




STANDARD WAVEFORM




Observation Conditions




Observation Conditions (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 vibrations in reduction vibration section




Point C:
Height of Zener voltage




ABNORMAL WAVEFORMS EXAMPLES