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Inspection Using An Oscilloscope (Reference)
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Vehicle speed signal
Vehicle speed signal
PCM terminal: 79 (+)-22 (-)
Oscilloscope setting: 1V/DIV (Y), 25ms/DIV(X), DC range
Vehicle condition: Driving speed 60 km/h [37 mph]
Fig 1: Identifying Oscilloscope Graph Vehicle Speed Signal
Courtesy of MAZDA MOTORS CORP.