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Wave patternobservation points

(Point}: Conditionofwave pattern build-upandmaximum voltage (Refertoabnormalwave pattern
examplesand 2.)

Condition of wave pattern build-up and maximum voltageProbable cause
Riseto the right to approximately 4.5V from around 2V.Normal
Becomesrectangular wave at approx: 2VBroken wire in ignition primary circuit
Becomesrectangular wave at power voltageMalfunction of the power transistor

Examples of abnormal wave patterns

Example

Wave pattern during engine cranking

Cause of problem

Broken wire in ignition primary circuit

Wave pattern characteristics

Top-rightpart of the build-up sectioncannot be seen,and
voltage value is approximately 2V too low_

Example

Wave pattern during engine cranking

Cause of problem

Malfunction in power transistor

Wave pattern characteristics

Power voltage results when the power transistor is ON.

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