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.