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Fuel injection control signal
Fig 1: Fuel Injection Control Signal - Oscilloscope Graph
Courtesy of MAZDA MOTORS CORP.
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