2003 Jeep Liberty Getting Two Codes On Liberty Large Small Evaporative

2003 JEEP LIBERTY
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MIEC
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I am getting two codes on my 2003 Jeep Liberty: Large and small evaporative emissions leaks. I have repaired all leaks verified the system is closed. Is it possible that a faulty leak detection pump would give the two codes large and small evaporative emissions leaks? I don't know what else to check.
Dec 18, 2012 at 12:42 AM
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HOMER1967
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it is possible that you have a bad ldp or pcm .i would have it diagnosed at a shop with a smoke machine.
Dec 18, 2012 at 12:54 AM
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JACOBANDNICKOLAS
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Before you do that, fog the system to see if there are any leaks. They will show up if there is a leak,
Dec 18, 2012 at 12:54 AM
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MIEC
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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?
Dec 18, 2012 at 1:45 AM
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JACOBANDNICKOLAS
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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.
Dec 18, 2012 at 1:49 AM
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MIEC
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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
Dec 18, 2012 at 2:45 AM
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MIEC
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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?
Dec 18, 2012 at 7:47 PM
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