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'[EE]: Re: OBDI tools?'
2002\02\26@125002 by James Paul

picon face
Herbert,

On GM cars, reading the codes is easy.   Under the dash usually close to
the steering column is a connector with 12 or so positions in it.
They are marked with letters.  Using a short piece of wire, connect
terminal "S" to terminal "A".  Turn on the key, but do not start.
The codes will flash out on the "Check Engine" or "Service Engine Soon"
lamp in the instrument cluster.   As far as decoding what the codes mean,
I could probably tell you later on today when I get home.  Otherwise, you
could go to the library and get a service manual for your vehicle or you
possibly could talk to a mechanic and have him decode them for you.
But anyway, that's how you can read the codes on GM vehicles.  If you have
any other questions, let me know after about 6:00 PM tonight, and I'll
see what I can dig up at home for you.

Hope this helps you out.


                                                 Regards,

                                                   Jim


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2002\02\26@152551 by Herbert Graf

picon face
Hello, thanks for the info. We've used this trick many times in the past and
it has been very helpful, however we now need some more "internal"
information to figure something out. First we need to know whether the car
is coming out of closed loop, and if so what sensor is slightly out of spec
causing closed loop to be lost. It's the kind of thing that doesn't cause a
check engine light, since the car still works pretty much fine, it's just
that our in-city mileage has gone up quite a bit, and if we don't figure it
out we may need to get a new catalytic convertor before the next emission
test. Thanks, TTYL

> {Original Message removed}

2002\02\26@230317 by Pic Dude

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face
Locate the OBD spec before you invest time in building a device for this.
I don't think that OBD-I can tell you at what points the car is in closed
loop or not.  Even if the check-engine light does not go on, the jumper
test will flash the appropriate trouble codes for any sensors that it
detects are out of spec.

Since it's free and basically one wire, I highly recommend this route before
investing time and money into building a "blind" device.

Cheers,
-Neil.


----- Original Message -----
From: "Herbert Graf" <spam_OUThgrafTakeThisOuTspamEMAIL.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Tuesday, February 26, 2002 2:25 PM
Subject: Re: [EE]: Re: OBDI tools?


> Hello, thanks for the info. We've used this trick many times in the past
and
> it has been very helpful, however we now need some more "internal"
> information to figure something out. First we need to know whether the car
> is coming out of closed loop, and if so what sensor is slightly out of
spec
> causing closed loop to be lost. It's the kind of thing that doesn't cause
a
> check engine light, since the car still works pretty much fine, it's just
> that our in-city mileage has gone up quite a bit, and if we don't figure
it
> out we may need to get a new catalytic convertor before the next emission
> test. Thanks, TTYL
>
> > {Original Message removed}

2002\02\27@105023 by Herbert Graf

flavicon
face
We have already used the one wire approach, it is not telling us what we
need to know. For example, if a temperature sensor says the coolant is at
190 degress but it is actually at 40 degrees how can the ECM know that it is
wrong? It can't, and that's why we need more then what the check engine
light is saying. Thanks for the suggestion. TTYL

> {Original Message removed}

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