Waveform 4

Fig 1: Waveform 4

Courtesy of SUBARU OF AMERICA, INC.

Measured terminal	Front oxygen (A/F) sensor heater signal (E158) No. 5 (+) - Engine ground 3 (E158) No. 63 (-):
Measured terminal	Rear oxygen sensor heater signal (E158) No. 10 (+) - Engine ground 3 (E158) No. 63 (-):
Measuring condition	While engine idling