it is possible that you have a bad ldp or pcm .i would have it diagnosed at a shop with a smoke machine.

Answered by homer1967 (expert)
416 answers provided

Before you do that, fog the system to see if there are any leaks. They will show up if there is a leak,

Answered by Jacobandnickolas (expert)
57,475 answers provided

I have pressure tested the entire system and I feel pretty confident that there are no leaks. I am curious as to how the PCM could be bad and only throwing codes related to large and small evap leaks?

Response from miec
6 questions asked

That is a good question. I would try the smoke test to make sure there are no leaks. I don't think it has anything to do with the PCM.

Answered by Jacobandnickolas (expert)
57,475 answers provided

OK I have taken various sections apart and pressure tested for leakes. I have repaired the leaks and I can pressurize a clear path from the purge solenoid to the tank. There are no leaks. Is there a test I can do to verify if the leak detection pump is operating correctly?

Thanks

Response from miec
6 questions asked

Another follow up. If the leak detection pump is truly bad, wouldn't there be another code that would come through beside the large and small leak?

Response from miec
6 questions asked