Re: [AMC-list] Pin in Pin out and WAIT a minute! OBD2 requires re-flash

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

Wow, it's great to have someone on the list who knows what he's talking about.  I'll shut up.

Joe Fulton

--- On Thu, 7/30/09, Jesse <j2sax@xxxxxxxxx> wrote:

> From: Jesse <j2sax@xxxxxxxxx>
> Subject: [AMC-list] Pin in Pin out and WAIT a minute! OBD2 requires re-flash
> To: amc-list@xxxxxxxxxxxx
> Date: Thursday, July 30, 2009, 2:20 PM
> Wow, leaving for vacation and no time
> for detials, however, on a pin test. you need a breakdown of
> what pins on the vehicle side of the ECM connector go to
> what and what the voltages are supposed to be and, in some
> cases, what conditions change the voltage.  
> 
> You will first find the ground pin and check it to make
> sure you have a good ground circuit to the ecm.  Then
> you will use that ground to CAREFULLY measure the voltage at
> each pin and compare it with the required amount.  Make
> sure your voltmeter is set to the proper range and make SURE
> you do not cross pins.  There has to be a club or forum
> somewhere that can supply you with the specifics for your
> vehicle...HOWEVER, BEFORE YOU DO ANYTHING ELSE.....
> 
> You mentioned this was a 1996 and that you put in a
> junkyard ECM... did you have the ECM flash re-programmed to
> your specific vehicle?  If not that is the source of
> all your problems.  All 96 and up Domestic vehicles
> have a Flash RAM Module that controls the ECM.  It USED
> to be that there was a removeable, hard-coded chip (PROM)
> but hte new vehicles have a RAM chip which accepts new
> software just llike a USB drive or digital camera with an SD
> card.  
> 
> Chryslers actually have a 2-3 step process for
> reprogramming.  If either your vehicle or the one you
> got the ECM fromm had a anti-theft system there are
> procedures taht have to be followed.  In addition to
> that and the OE calibration software upload, in Chryslers
> you also have a separate step to "upload the VIN, mileage
> and Pinion factor".  
> 
> Very few aftermarket shops have the capbilities to do this
> as it requires specific hardware that allows communication
> through the ALDL port (diagnositic plug under your dash) to
> the OE website that allows the upload.  (Either a
> factory diagnostic tool or a properly equipped PC with a
> pass through device will work.)  
> 
> In most cases you have to go to a dealership to get it
> done, but check around to see if someone in the aftermarket
> can do it more inexpensively.  
> 
> Do NOT let someone offer to program it "off the vehicle" as
> this rarely works on Chryslers and NEVER with one that has
> antitheft
> 
> do NOT let some guy with a Snap On "Brick" tell you he can
> do it.  The only thing he will be able to do is upload
> the VIN/Mileage/Pinion factor.  The ECM calibration
> file can ONLY be done with a Flash Reprogramming
> device.  
> 
> Finally, make sure that they check for "relearn
> procedures".  In some vehicles, when you introduce a
> new ECM into the engine management enviroment, the inputs
> and controlled devices will not "play nice" until they are
> properly introduced to the ECM, which requires a specific
> procedure to be done, even after the Flash.  Any
> dealership will know this, if it is required.  
> 
> Gotta run, good luck!  
> 
> Jesse
> 
> 
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