Cooling fan control signals

PCM terminals 

• 1W(+)-1AA(-)

Oscilloscope setting 

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (engine speed approx. 700 rpm, A/C ON)

Fig 1: Cooling Fan Control Signals Pattern

Courtesy of MAZDA MOTORS CORP.