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Section 432 (Engine Control System)
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Pcm Inspection
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Inspection Using An Oscilloscope (Reference)
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CMP
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Inspection Using An Oscilloscope (Reference): CMP
WARNING:
This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
PCM terminal: 28 (+)-2 (-)
Oscilloscope setting: 0.5V/DIV(Y),10ms/DIV(X), AC range
Vehicle condition: idle after warm up
Fig 1: Identifying Oscilloscope Graph (CMP)
Courtesy of MAZDA MOTORS CORP.