Vehicle speed signal

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

PCM terminal: 79 (+)-22 (-)
Oscilloscope setting: 1V/DIV (Y), 25ms/DIV(X), DC range
Vehicle condition: Driving speed 60 km/h [37 mph]

Fig 1: Identifying Oscilloscope Graph Vehicle Speed Signal
Courtesy of MAZDA MOTORS CORP.