Mazda RX-8 Workshop Manual page 1221

NOTE:
Purge control might not be activated depending on the engine conditions.
APV motor control (+)
Terminal connected: 2D (+)—Negative battery terminal
Oscilloscope setting: 5 V/DIV (Y): 20 ms/DIV (X), DC range
Measurement condition: High engine speed after warm-up
OCV control
Terminal connected: 2E (+)—Negative battery terminal
Oscilloscope setting: 5 V/DIV (Y): 2 ms/DIV (X), DC range
Measurement condition: Idling after warm-up (no load)
APV motor control (–)