If the engine is still in the vehicle, all you would need to do is supply a power to the battery cable, and press the button on the cluster, and it should power on, as long as all the fuses are in place.
One more question...(sorry) .... I have the VIN for the vehicle the engine supposedly came out of which checks with the mileage quoted. It still has the computer attached....but... Is there are part of the VIN stamped in an LL8 to confirm that the engine matches the VIN I was given. I saw the file posted which shows an Engine ID...(like on some early small blocks) but is that sequence # supposed to be part of the vin? This engine does not have tags where those are shown. It does have a bunch of numbers stamped in the pad back where the trans mounts on drivers side. Any clues?
That's great info thanks... My old engine is in the car but every wire is disconnected and the battery is removed preparing to pull engine. So would have to backtrack to put the Replacement Engine's ECM in there. I was wondering if that would even work as the VIN wouldnt match the key???? As for the bench I've worked with Kent-Moore harnesses an breakout boxes so I know people that have the programs and harnesses to read/program the ECM on the bench can read it. I believe without those special harnesses I would need to get an obdII port and wire it. The other thing I am not sure of is when you read that data from the ECM is it stored in the ECM? When the ECM is in the car, it talks to the Transmission Controller (if equipped) the body Control Module, the ABS Control etc and even the dash. So while you may retrieve mileage when tapped into OBDII is it really in the ECM? or is the ECM retrieving it from elsewhere?
Thanks for your help
Ok so the "10" in your example is telling me the PCM is storing the VIN. Cool. Now what about mileage that appears on the dash? DO you know whether the PCM or what other module stores that?You know where it's coming from by reading the 3 byte header of the SAE J1850 VPW message. Every message has this identifying header that declares what kind of message is it, how important is the message, who the message is intended for, and who is sending the message. If the PCM had requested the data from somewhere else that request would be seen on the data bus.
Ok thats what I thoughtMileage is kept in the gauge cluster.
If a PCM is from the same year, it would still work. Just have to do a security relearn. It can be done without a scanner. Using the PCM with the engine it came with would avoid having to do a CASE relearn.
huge problem after PCM update / calibration (PCM Security Relearn)
Ok thats what I thought
Ok so the "10" in your example is telling me the PCM is storing the VIN
It is very interesting!!Of course it leaves open the question of where it gets that VIN. Is it only programmed into it? Or are there operations that it does to acquire that VIN, like during a security relearn. I know this much, because I have captured the serial data and can read and translate it. Early on when the engine is being started the BCM broadcasts the VIN over the serial data bus. It does so without any module requesting it. However, very shortly later I have seen the Supplumental Restraints module request the 2nd through 5th character of the VIN and receive it from the BCM. And if you are testing communications and have the instrument cluster up and running without a BCM present on the network then the cluster repeatedly requests the full VIN number.
I find this stuff fascinating.
Did you have any idea of what those stamped #'s are in my second picture? I'm used to "old" Chevy's where the VIN (or part thereof) is stamped somewhere into the engine. Supposedly there is a tag (not stamp) but its gone on both engines. Luckily, when they pulled the engine I bought they only took off AC, PS, & Alternator. They left computer, fan, manifolds throttle body etc. The VIN provided and actual salvage auction match the claimed mileage. But it dawned on me, if there's no stamp, what to stop them from claiming every other 2008-2009 4.2 they sell is related to the same VIN with the same low miles if there's no computer attached to confirm the VIN. Its not exactly the most honest industryMileage is kept in the gauge cluster.
If a PCM is from the same year, it would still work. Just have to do a security relearn. It can be done without a scanner. Using the PCM with the engine it came with would avoid having to do a CASE relearn.
huge problem after PCM update / calibration (PCM Security Relearn)
No.... but they dont appear to either on my original car I got from my friend who is the original ownerDo any of those numbers (I see like 3 different sets of digits there) match up at all with the VIN they provided?
I should have read the post first I guess. I see now it wouldn't match the vin. I can see mine is stillthere got the sticker after 20 years!Do any of those numbers (I see like 3 different sets of digits there) match up at all with the VIN they provided?