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

Fuel Injection Control Signal

PCM terminal
- No.1: 2A (+) <-> 3A (-)
- No.2: 2D (+) <-> 3A (-)
- No.3: 2G (+) <-> 3A (-)
- No.4: 2J (+) <-> 3A (-)
Oscilloscope setting: 2.0 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition: Idling after warm-up

Fig 1: Identifying Fuel Injection Control Signal
Courtesy of MAZDA MOTORS CORP.