Re: VW Golf V6 4 Motion 2002 6 wire O2 sensors Archived Message
Posted by Dave Hill on April 24, 2007, 10:13 pm, in reply to "Re: VW Golf V6 4 Motion 2002 6 wire O2 sensors"
I have scoped a couple of Volvo's recently (V70 2.3 turbo). In both cases I probed the pink wire & got some interesting captures. The red trace is the MAF output & the blue is the pre cat (wideband) O2 sensor pink wire. From left to right.…… fast idle shows good switching & then the MAF falls away as I lift the throttle & blue trace goes high as the system goes lean. (opposite to conventional sensor output)
The post cat sensor is a zirconia four-wire type (not shown)
Cheers for now
Dave
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