Vehicle condition

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Idle after warm up (engine speed approx. 700 RPM, no load, P/S off, A/C off)

Fig 1: Inspecting HO2S (Front) Heater Control Signal Using Oscilloscope

Courtesy of MAZDA MOTORS CORP.