July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Oil Control Valve (OCV) Signal

PCM terminal: 4D(+) <-> 4A(-)
Oscilloscope setting: 2.0 V/DIV (Y), 0.5 ms/DIV (X), DC range
Vehicle condition: Idling after warm-up (no electrical load)

Fig 1: Identifying Oil Control Valve Signal
Courtesy of MAZDA MOTORS CORP.