Oscilloscope Patterns and Waveforms

IGNITION PRIMARY VOLTAGE WAVEFORM CHECK

MEASUREMENT METHOD

1. Disconnect the distributor connector and connect the special tool (test harness: MB991348) in between. (All of the terminals should be connected.)




2. Connect the analyzer primary pickup to the distributor connector terminal 2.
3. Connect the primary pickup ground terminal.
4. Clamp the spark plug cable with the trigger pickup.

NOTE: The waveform of the cylinder clamped to the trigger pickup will appear at the left edge of the screen.

STANDARD WAVEFORM

Observation conditions




1. Raster




2. Display

Waveform Observation Points:

WAVEFORM OBSERVATION POINTS

Abnormal Waveform Examples:

ABNORMAL WAVEFORM EXAMPLES