Traction Control

Thu Sep 21 02:11:43 GMT 2000

Nothing labeled 'OPTION', is it one of the 50 or so 3 digit codes on the label?  I have a wire going to the top of the axle housing.  I don't have the ASR (acceleration slip reduction) option,  but I'd like to duplicate it's function if I can. Winter's coming
soon.

Bill

Len Sabatine wrote:

>     Is your Z28 Equipped with the OPTION Hardware and on the Parts List
> Label in glove box ?

>     If your rear axles BOTH have a reluctor / transducer on them , you have
> Traction Control. If not , It's a
>     non issue , far as what I've seen. Non TC have 1 x 'ducer above ring
> gear , on top of axle housing.
>
>     Len
>
> >Tunercat has a selection and table for traction control for my 94 Z28
> >which is enabled,  but traction control isn't engaged.  Does anyone know
> >if there is an electrical switch to enable traction control?  If so on
> >which pin does the signal enter the PCM?  I
> >don't see anything labeled 'Traction control' on the PCM pinout document.
> >
> >Bill
> >
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> ------------------------------
>
> Date: Tue, 19 Sep 2000 21:35:00 -0400
> From: Scott Lundahl <scott at lumenetics.com>
> Subject: MAP sensor location
>
> Where is the stock GM MAP sensor location?  I have mine mounted on the
> engine itself.  I'm getting irregular MAP sensor readings when monitoring
> and I'm wondering if the sensor is damaged or being influenced by engine
> vibrations.  Are there any caveats regarding mounting location/postion?
>
> Thanks,
>
> Scott
>
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> ------------------------------
>
> Date: Tue, 19 Sep 2000 21:28:24 -0500
> From: Tom Sharpe <twsharpe at mtco.com>
> Subject: Re: aldl stuff
>
> Why doesn't someone work up a power supply driven from the parallel port or the
> mouse port or the keyboard port??  just an extra connector????  TomS
>
> Peter Gargano wrote:
>
> > Mike Swayze wrote:
> > >
> > > managed to get the max232 ALDL interface soldered up this past weekend, just
> > > need to put it in a box and try it out. I was wondering if one of the ALDL
> > > connector pins is hot as in +12V, ...
> >
> > Mike, from past discussions, there *are* some US vehicles that
> > don't have 12V on the connector. So, most people use the lighter
> > socket, or the modem signal driver circuitry diode arrangement.
> > Both Andrew M and I have documented this change, and some people
> > have found that low power laptops have had problems supplying
> > the modem status line power for a MAX232.
> >
> > >... only thing I had read in the archives was
> > > about one of them only being hot when the transmission was in neutral  (or
> > > something like that).
> >
> > That's because someone connected to one of the ECM's outputs
> > that was only at 12V sometimes!
> >
> > BTW. it seems all Australian ALDL connectors do have permanent
> > 12V available.
> >
> > HTH, Peter
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> ------------------------------
>
> Date: Tue, 19 Sep 2000 18:39:23 -0700
> From: Garfield Willis <garwillis at msn.com>
> Subject: RFD Keeper Thread, Anyone?
>
> Once upon a long time ago, I asked the following:
>
> >Would anyone onlist be willing to take a stab at explaining how
> >the analog stuff on the memcal is used in limp mode, electrically
> >speakin? The only thing I've heard so far is the resistive network
> >sets the cyl-count, but that's about it as far as my understanding
> >goes.  Just exactly what else does the memcal provide to the ecm in
> >limp mode, and how does the ecm use it. In short, say more please!
>
> After some catching up with his email, Walt sent me this offlist:
>
> On Fri, 15 Sep 2000 18:31:25 -0700, "Walter Sherwin"
> <wsherwin at home.com> wrote:
>
> >... Within the MEMCAL
> >there will typically be two resistive network chips located under the
> >clear-gooy-coated  SNEF structure.  Two of those resistors (usually R28 and
> >R29) will hardware mode the PCM/ECM into a certain injector firing scheme
> >based upon cylinder count and intended firing schedule, and will usually be
> >isolated from the other resistors in the network.  The other integrated
> >resistors participate in an analog network, to communally shape a
> >rudimentary fuel curve based upon CTS, RPM and TPS (or MAP).  I've read
> >through the documentation on same, and don't see a clear path as to how to
> >post-calibrate the analog feature (refered to by GM as the Redundant Fuel
> >Device (RFD)).  Also, the OE RFD cal tended to be shared across many
> >platforms, and was NOT very accurate when called upon (kinda like it was an
> >afterthought).
>
> Walt mentioned this has been discussed briefly before onlist, but
> didn't ever get fleshed out fully. Can we try jointly to fill in the
> missing pieces? Surely there must be some onlist that know how these
> res networks are used by the ECM.
>
> My first question would be, what are the inputs feeding these analog
> cal res networks? I expect that the portion that dictates
> #ofCyls/firingMode is likely just a voltage that has a few select
> values for 4, 6, or 8 cyl memcals; I kinda remember this part being
> discussed before. But what about the "rudimentary analog fuel curve";
> anyone have a schematic that shows what if any sensors feed this
> network, as well as how the ECM reads this network, or does it even
> read it directly with an A/D port.
>
> If it doesn't happen naturely, I'll be happy to summarize and compile
> as we go. Hey, maybe it's really dirt-simple, and I'm the only one in
> the dark on this. If so, please enlighten me by telling all you know.
> Enquirer minds wanna know. :)
>
> Gar
>
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> ------------------------------
>
> Date: Tue, 19 Sep 2000 21:59:43 -0400
> From: "Bruce Plecan" <nacelp at bright.net>
> Subject: Re: MAP sensor location
>
> How close to the plug wires?, any miss from like a plug misfiring?.
> They mount them on the engine all the time.
> I perfer the fenderwells for vibration isolation, jus need to use that hard
> small ID line for best results.
> Bruce
>
> > Where is the stock GM MAP sensor location?  I have mine mounted on the
> > engine itself.  I'm getting irregular MAP sensor readings when monitoring
> > and I'm wondering if the sensor is damaged or being influenced by engine
> > vibrations.  Are there any caveats regarding mounting location/postion?
> >
> > Thanks,
> >
> > Scott
> >
> >
> >
> >
> >
> >
> >
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> >
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> ------------------------------
>
> Date: Wed, 20 Sep 2000 13:06:17 +1000
> From: Peter Gargano <peter at techedge.com.au>
> Subject: Re: aldl stuff
>
> Why not get 12 Volts from the Games port? (just joking!)
>
> Tom Sharpe wrote:
> >
> > Why doesn't someone work up a power supply driven from the parallel port or the
> > mouse port or the keyboard port??  just an extra connector????  TomS
>
> I think the answer is convenience, with a secondary consideration
> of cost.
>
> Peter
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> ------------------------------
>
> Date: Tue, 19 Sep 2000 23:07:14 -0400
> From: Len Sabatine <sabatine at epix.net>
> Subject: Re: MAP sensor location
>
>   A solid mounting as close to  direct manifold  vacuum source as practical
> , FWIW  ,TBI , wet  manifold  need a little
> distance to avoid getting fuel into sensor. TPI , MPI etc,  Dry Manifold ,
> close as you can get. Production locations vary per
> specific engine design , which are usually well placed in normal usage.
> Avoid snuggling up to an EGR feed orifice in plenum.
>   Look at a TBI setup , then Look at an LT1.    These are suggestions.
>
>    Len
>
> >Where is the stock GM MAP sensor location?  I have mine mounted on the
> >engine itself.  I'm getting irregular MAP sensor readings when monitoring
> >and I'm wondering if the sensor is damaged or being influenced by engine
> >vibrations.  Are there any caveats regarding mounting location/postion?
> >
> >Thanks,
> >
> >Scott
> >
> >
>
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