Purge Control Signal

PCM terminal: 3C(+) <-> 4A(-)
Oscilloscope setting: 2.0 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition:
- ECT: above 80°C {176°F}
- D range and 7.5 km/h {5 mph} or below
Fig 1: Identifying Fuel Purge Control Signal
Courtesy of MAZDA MOTORS CORP.