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

Wheel speed

ABS/TCS HU/CM terminal:
RR: A(+) - B(-)

LR: C(+) - F(-)

RF: G(+) - D(-)

LF: I(+) - E(-)
Oscilloscope setting:
1 V/DIV (Y), 2 ms/DIV (X), AC range.
Vehicle condition: Driving 30 km/h (18.6 mph)

NOTE:

As vehicle speed increases, the wave period shortens.

Fig 1: Inspecting Wheel Speed Using An Oscilloscope
Courtesy of MAZDA MOTORS CORP.
If there is malfunctioning in the sensor rotor, the wave profile warps.