IAC control 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: 88 (+)-22 (-)
Oscilloscope setting: 2V/DIV (Y), 0.1ms/DIV (X), DC range
Vehicle condition: idle after warm up

Fig 1: Identifying Oscilloscope Graph IAC Control Signal
Courtesy of MAZDA MOTORS CORP.