Water temperature gauge 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: 70 (+)-100 (-)
Oscilloscope setting: 1V/DIV (Y), 40ms/DIV (X), DC range
Vehicle condition: idle after warm up

Fig 1: Identifying Oscilloscope Graph Water Temperature Gauge Control Signal
Courtesy of MAZDA MOTORS CORP.