Okay, that makes sense. That deals with what is called the purge valve in the EVAP system. What is happening is under a non-purge condition, there is too much pressure building up in the system. That is where the term pressure sensor came from. Now I understand. There are a few things that can cause this:
EVAP canister vent valve not operating
EVAP canister could be plugged
Faulty EVAP pressure sensor
EVAP canister vent wiring is shorted, open, or has a poor connection.
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Thursday, April 9th, 2015 AT 6:04 PM