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Wave pattern observation points

(Point): Condition of wave pattern build-up and maximum voltage (Refer to abnormal wave pattern
examplesand 2.)

Condition of wave pattern build-up and maximum voltageProbable cause
Rise to the right to approximately 4.5 V from around 2 VNormal
Becomes & rectangular wave at approx2 VBroken wire inignition primary circuit
Becomes arectangular wave at power voltageMalfunction of the power transistor

Examples of abnormal wave patterns

Example 1

Wave pattern during engine cranking

Cause of problem

Broken wire in ignition primary circuit
Wave pattern characteristics

Top-right part of the build-up section cannot be seen, and
voltage value is approximately 2 V too low:

Example 2

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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