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    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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