Mazda RX-8 Workshop Manual page 1224

Terminal connected:
FP: 2BB (+)—Negative battery terminal
RP: 2BD (+)—Negative battery terminal
Oscilloscope setting: 5 V/DIV (Y): 10 ms/DIV (X), DC range
Measurement condition: Idling after warm-up (no load)
Terminal connected:
FP: 2BB (+)—Negative battery terminal
RP: 2BD (+)—Negative battery terminal
Oscilloscope setting: 5 V/DIV (Y): 10 ms/DIV (X), DC range
Measurement condition: Cranking while the engine is cold. (ECT: Approx. 20 °C {68 °F})
HO2S heater control
Terminal connected: 2BE (+)—Negative battery terminal
Oscilloscope setting: 5 V/DIV (Y): 100 ms/DIV (X), DC range