1999 5.3L vs 2004 5.3L (L59) PCM differences

Long story short, I have a PCM from a 1999 4.8/5.3 (Red/Blue connectors) and as of tomorrow will instead end up with a 2004 5.3L L59 engine which looks like uses the PCM with Blue/Green connectors. Will the PCM with Red/Blue function ok as long as I use a matching Red/Blue harness to connect to the 2004 5.3L? Reason I ask is I already bought a PCM with VATS deleted etc and a standalone wiring harness for the 1999, of which turned out to be a 4.8L (one of my many lessons learned as a newbie to these modern engines :mad1:).

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Originally Posted by 53dawLsSwap

Long story short, I have a PCM from a 1999 4.8/5.3 (Red/Blue connectors) and as of tomorrow will instead end up with a 2004 5.3L L59 engine which looks like uses the PCM with Blue/Green connectors. Will the PCM with Red/Blue function ok as long as I use a matching Red/Blue harness to connect to the 2004 5.3L? Reason I ask is I already bought a PCM with VATS deleted etc and a standalone wiring harness for the 1999, of which turned out to be a 4.8L (one of my many lessons learned as a newbie to these modern engines :mad1:).

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As long as it has a return style fuel system and the same injectors it was calibrated for it will run. That being said the 04 is likely DBW and the 99 DBC.

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Originally Posted by Fast355

As long as it has a return style fuel system and the same injectors it was calibrated for it will run. That being said the 04 is likely DBW and the 99 DBC.

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Ok thanks. Right, I was going to swap just the BDW TB for the DBC TB, but perhaps swapping the complete intake would make most sense at this point? If I didn't have issues with the OBDLink for the bench harness I made, perhaps it wouldn't be as big of a deal.....but for now, am going to assume I won't be able to get my bench harness to work properly before I go to install the engine/transmission.

The bench harness is the same for the blue/red(09-02) and blue/green(03-08)

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Originally Posted by In-Tech

The bench harness is the same for the blue/red(09-02) and blue/green(03-08)

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Thanks. In general, is the Blue connector on both exactly same with only the Red/Green connectors being different? Just curious.

Here ya go.

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Originally Posted by In-Tech

Here ya go.

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Thanks!

I wish I could give credit to the author. These docs have helped me many times.

Maybe it's this guy.
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