1998 LS1 to 2000+ LS1 conversion?

[KAZ MotorSports]

Quick question...may sound dumb to some, but I am in the learning curve here so bare with me please.

Are all the 411 PCM's the same? Is this year specific for the PCM? The reason I ask is because I have a pin in/out layouts for 3 different vehicles. 1996 Vortec, 1998 Vortec, and then this swap 1998 T/A. There are differences in pin definitions between them for "where they go" in the 411.

Is it the OS that defines which pin receives/sends the sense data?

Thank you for the education!!
-Kenny

[Dale]

The ECM can be reflashed to many different OS and tunes. The vortec and LSx use the same OS, but with night and day options swapped on the tune.

You need to pin it for whatever motor its going to run. I am guessing an 02 LSx motor. Toss that vortec stuff to the side for now, its just making it more confusing for you.

[KAZ MotorSports]

It is a 1998 LS1 motor with a 12200411 PCM using Al's conversion charting...I am in the process of completely gutting the harness(s) at the "T" in preparation to make it look all pretty. Obviously I will not tape anything up until I have it running...but this is what I should have done to start. Hindsight is always 20/20 right?

No offense but...my question was not really answered. Is it the OS that determines what sense in/out is at which pin for the PCM? Is Al's wiring layout for a specific OS and make model that needs to be flashed into the 411 after the repinning? Or can a 2002 Manual T/A COS-3 and cal be flashed in?

Yes I am making this more confusing than it needs to be and the Vortec sheets are far from sight now...but I like to be taught exactly what I am doing and why. Not just a "do this and you are done."

-Kenny

[joecar]

Kenny,

This is my understanding:

• the 411 PCM hardware defines which inputs/outputs are bound to which pins on the red/blue PCM connectors [this is not quite right]; I believe all 411 PCM's are identical;
• the OS defines the "features" (i.e. which calibrations/tables are available);
• the calibrations define the "operating characteristics" (i.e. the values for the various tables);

The OS and calibration may define some of the pinouts.
Al's pinout document is for the LS1 00/01/02/OCS3/COS5 OS's running on the 411 PCM [...Al, excellent doc... ].

If you're thinking about COS5, then you will want to flash in OS 12212156 as this allows easy migration to COS5; i.e. copy all your old tables to 12212156 and get the car running properly; then the jump to COS5 is very simple.

Cheers,
Joe

Edit: see blue.

[Dale]

IMO, it is MOSTLY the OS, but some of it will be the tune also. Reason I say this is there are some power differences between the vortec and LSx pins. They use the same OS, yet different tunes.

If you wire it like Al's... At glance it looks good to load the 411 with Cos3 and 00/01/02 LSx. It will not work for a 4.3 s10, vortec 5.7, 5.3, etc.

take a look at holdencrazy.com. It has alot of stock and modded tunes. You can see what PCM came with what OS, and what tune.

[joecar]

Ah, ok, so that means some of the hardware is generic and the OS/calibration binds it to a specific pinout... I learning stuff everyday...

Yes, Al's doc is for 411 with LS1 01/02/COS3/COS5... I'm not sure about 00 but may be also.

COS3 is based on several of the 00/01/02 OS's.
COS5 is based on the 02 OS.

[joecar]

So basically, is this how it goes:
- the PCM hardware defines some pinouts;
- the OS and/or calibation define some pinouts.

I edited my 2 posts above to indicate this.

[Dale]

I'm hunting for the doc/xls that showed the differences. I cant seem to find it on my 2 works or laptop. Hopefully its on my home pc and I can share it later.

[joecar]

Reviews/comments are welcome (I want to get good info here)...

[KAZ MotorSports]

OK...I am still pretty-ing up the wires and I think I found why I had no comms...hopefully I did not fry the PCM (not a big deal I have 3 more on the bench) with my ignorance and tired mind yesterday.

I Al's .doc at the bottom it states that Red C1-60 BRN, Blue C2-19 PNK (PCM IGN Feed), C2-58 PPL (Serial Data), and C2-20 ORN (PCM BAT Feed) remain in the same locations. I labeled them as stated above and plugged everything in...not paying attention to the COLOR code swap, just putting them to those pin locations!!

If the PCM is not powered, told to switch on, or have a serial data link it makes no wonder why I could not communicate with it.

I will bench test it here in a few to see if I killed it. Any tests other than loading .cal files to see if it is cooked due to my ignorance?