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Inspection Using An Oscilloscope (Reference)
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IAC control signal
IAC control signal
PCM terminal: 88 (+)-22 (-)
Oscilloscope setting: 2V/DIV (Y), 0.1ms/DIV (X), DC range
Vehicle condition: idle after warm up
Fig 1: Identifying Oscilloscope Graph IAC Control Signal
Courtesy of MAZDA MOTORS CORP.