gpr

iTrader: (6)

Finally got all the wiring on a 5.3l swap to where i could start the engine. Tried starting it but had no spark, figured it was the VATS disabling something. So i tried connecting efiLive to download the tune, modify it and reflash pcm. However, I can not connect with efilive to the PCM.

I doubled checked the obd-II port and it seems wired correct. I have continuity between pin 2 on the obd-II port and pin 58 of the blue pcm connector. The ground is good on pin 4&5, as well as power to pin 16.

What else is there to check? I tried connecting efilive using the ls1b pcm type, as i would assume that is what is used on a 2003 5.3l flex fuel engine?

S10xGN

iTrader: (11)

Sure you have all your power and grounds hooked up?

lsxRanger94

Make sure pin 16 is hot at all times(typically cigarette lighter circuit) and Key is in the run position.

gpr

iTrader: (6)

Pin 16 is powered all the time, and when i plug efilive box into it, it powers the box up. All power and grounds seem to be correct. I can turn key on and fuel pump primes, throttle body turns on and opens, the engine mil light turns on....

I have a 2002 pickup with a 5.3 lm7 and a 2002 camaro. If I swapped their pcms into this harness would it hurt anything? They are both drive by cable, and I know they changed the truck harness in 2003. I'm just wondering if my pcm is fried or "bricked", but don't know a way to test and verified.

lsxRanger94

If it's a red/green connector on the harness then yes. Red/blue harness connector won't plug into red/green pcm without a little modification and the pinouts are different. But it can be done easily.

Check the link out about halfway down the page.
http://www.lt1swap.com/cable_conversion.htm