Re: Lambda sensors - Where, Why and how Much ?

["Bruce Plecan" <nacelp@bright.net>]

> Yes and maybe no.

Welp, guess all you want, I have one here, and have used it that way and it
works.
The topic was what the connections were, not how the ecm is wired
internally, not connecting the sensor ground gets you no reading.  On all
the earlier ecms, there is a specific ground for the O2, just now they have
a seperate wire for it that leads to the sensor,  they probably just figured
out that with age grounding the sensor thru the exhuast piping wasn't all
that clever.
  I never even implied the 4 wires were universally the same.
Grumpy

>
> The workshop service manual shows one pair of wires connected between +12V
> (power) and 0V (ground), when the ignition is on. I'm guessing this is
some
> kind of heater. The other pair of wires (from the sensor ?) go directly to
> the ECU, connecting on pins J1-A21 and J1-A16 for the front 02 sensor, and
> J3-C20 and J3-C15 for the rear sensor.
>
> It could be that that some of these pins are grounded out in the ECU, but
I
> don't know that to be true. It is just as possible for the receiver
circuit
> inside the ECU to be a differential/balanced one in order to eliminate
> noise picked up on the wiring harness. If so then neither end of either
> sensor is/needs to be grounded.
>
> But are you saying that basically any "one type fits all" 4 wire Lambda
> sensor from a major manufacturer (Lucas, Bosch,Delphi) will work ?
>
> Cheers,
> Malcolm Robb, LC 0112G
>
> -----Original Message-----
> From: Bruce Plecan [SMTP:nacelp@bright.net]
> Sent: Thursday, June 08, 2000 5:23 AM
> To: gmecm@diy-efi.org
> Subject: Re: Lambda sensors - Where, Why and how Much ?
>
>
> 1-sensor
> 1-power
> 2- grounds
> Grumpy
>
> >     Is the 4th wire for an external O2 gauge? How do you have the
> connector
> >     wired on the harness side?
> >
> >         Thanks,
> >             Ed
> >
> > --
> >
> > Every Day In Every Way,
> > I Love My Bandit More And More
> >
> > Bandit 1200 10.64 @130 Head never been off
> > 1987 GN Traction Limited Mid 13.
> >
> > Edward J. Malkiewicz
> > Las Vegas, Nevada
> > krazyed@worldnet.att.net
> > 702-645-5997 (Voice)
> > 702-245-9053 (Cell)
> >
> >
> >
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