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Inspection Using An Oscilloscope (Reference) CKP
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Vehicle speed signal
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
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 Vehicle Speed Signal Waveform
Courtesy of MAZDA MOTORS CORP.