My issue revolves around a reoccurring fault code P1665 that is tied to the use of the operating system 12212156 that is running the 5.7 Vortec V8 in my 2002 GMC Astro Van
My interest in resolving this issues is I need the ODB2 monitors to function like a factory installed V8 in a similar chassis so I can pass the states emissions test procedure.
So, eliminating the fault code from the engines self-diagnostic fault codes is not an option, and since it is an emissions issue, it needs to function.
Here is what I have tried and what I have learned to this point.
P1665 relates to the tank vent valve under the van by the tank and has 2 wires, pink which is 12V power and Green/White to the PCM under C2 pin 34 where the PCM grounds the wire to activate the vent valve solenoid. This valve worked properly when the V6 was in the van and running OS 12212156.
the new V8 has an EGR system which the 2002 V6 did not have, so the OS is different somewhere in its code, I suspect.
I have done segment swaps on a dozen available tunes running OS 12212156 in search of an OS that operates all of the emissions equipment that is on the V8. I've tried 2001 Savana, 2002 Savana, 2002 Express, and a few modified tunes that Ive picked up from the forum and other sites.
I finally found one that has the name "CHRIS 350 0411" which I don't know where I got it from but is has all the right emission system monitors active, although most are set to test complete immediately after clearing codes such as the P1665. I assume the person that modified this OS modified it this way, a minor issue for me at this time although I would like them to function properly at some point in the future.
So now my issue is how do I modify the OS 12212156 to properly activate and monitor the electronic component in the computer to run the EVAP vent valve and not throw the fault code? This as well as modify the OS to allow for the other emissions related self-test to operate properly?
Im know nothing about coding, but I ive been able to get this far on luck and google.
Any help would be much appreciated.
Unfortunately It looks like I cant attach the tunes at this time.
Thank you
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Originally Posted by dinno246
