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Standard wave pattern

ExplanationofWavePattern

Thepumpspeedsensordetectstherotationofthepumpshaft.Accordingly,theperiodT(seconds)
canbemeasuredandtheenginespeedcanbecalculatedfromthefollowingformula.

2

Enginespeed=×60
4 × T (sec)

WavePatternObservationPoints

Check that cycle time T becomes shorter and the frequency increases when the engine speed is increased.

ExamplesofAbnormalWavePatterns

DExample1

Causeofproblem

Malfunctionoropencircuitinsensor

Wavepatterncharacteristics

Nosignalisoutputevenwhenengineisstarted.

DExample2

Causeofproblem

Incorrectgapbetweensensorandsensinggearplate
Wavepatterncharacteristics

No signal is output even when engine is started,or signal
amplitudeissmall.

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