MOTRONIC -> O2 SENSOR

[xxalexx at ix.netcom.com]

> Date:          Thu, 20 Aug 1998 15:40:57 -0700 (PDT)
> From:          Mike Macpherson <mike760 at yahoo.com>
> Subject:       MOTRONIC -> O2 SENSOR
> To:            diy_efi at efi332.eng.ohio-state.edu
> Reply-to:      diy_efi at efi332.eng.ohio-state.edu

> I have been inside my ECU and comparing it to the Volvo wiring
> diagrams i found 11 unused pins, but
> only five of them were not wired up to anything inside the ECU, so
> that left 6 pins wired in but with nowhere to go. I boought a Haynes
> EFI manual (ok its not the most advanced book but good for
> startingout) and found pin outs for the unit, which is also used on a
> few BMWs and one or two othor cars, i matched the wiring to the Volvo
> diagrams and all of them matched up exactly, also given was the
> function of the
> othor 6 pins, one of them was OS signal, i have an oxygen sensor which
> i was going to hook up to an A/F meter, is it possible that the unit
> will accept signals from an O2 sensor? also one of the othor pins was
> OS relay driver, ive never seen a relay assosiated with an O2 sensor,
> what is the function of this? i thought it may be for the preheater?
> 
The air flow meter will not accept signals from a O2 sensor.
The airflow meter and O2 signals go into the computer.
Yes many vehicles have a relay for O2 sensor heater.
What year is computer?, if a  pre 92 euro, maybe does not use
O2.  I have seen some foreign  MB were you would have to
enable lambda in airflow harness or in speedometer.
You will probably need factory wiring diagrams.
alex