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Inspection Using An Oscilloscope (Reference) CKP
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Water temperature gauge control signal
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Water temperature gauge control signal
PCM terminal: 70 (+)-100 (-)
Oscilloscope setting: 1V/DIV (Y), 40ms/DIV (X), DC range
Vehicle condition: idle after warm up
Fig 1: Identifying Water Temperature Gauge Control Signal Waveform
Courtesy of MAZDA MOTORS CORP.