Evaporative Emission Symptom Chart

EVAPORATIVE EMISSION SYMPTOM CHART

Problem	Possible Cause	Action
Leakage In The Evaporative Emission (EVAP) Canister Or Canister Vent Solenoid	Canister vent solenoid stuck open Weld seam leaks O-ring seal leaks	See PINPOINT TEST 1: EXCESSIVE FUEL ODOR .
Blockage In The Evaporative Emission (EVAP) Canister Or Canister Vent Solenoid	EVAP canister blockage Canister vent solenoid blockage Canister vent solenoid output hose blockage	See EVAPORATIVE EMISSIONS SYSTEM PINPOINT TEST 2: HISS WHEN OPENING FUEL CAP .
Unable To Refuel The Vehicle	Damaged fuel filler pipe Damaged canister vent solenoid Damaged fuel vapor valve tube assembly	See EVAPORATIVE EMISSIONS SYSTEM PINPOINT TEST 3: UNABLE TO REFUEL VEHICLE .