Oscilloscope Patterns and Waveforms

Standard Wave Pattern Observation Conditions




Standard wave pattern

Wave Pattern Observation Points
Check that cycle time T becomes shorter when the engine speed increases.




Examples of abnormal wave patterns
- Example 1
Cause of problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the engine is not started.




- Example 2
Cause of problem
Loose timing belt
Abnormality in sensor disk
Wave pattern characteristics Wave pattern jumps to the left or right.