Test C: Hissing Sound When Removing Fuel Cap

NOTE: After each service or repair procedure has been completed, reconnect all components and perform DRIVE CYCLES under QUICK TEST in SELF-DIAGNOSTICS - VILLAGER article. Clear DTCs, if necessary, and repeat QUICK TEST procedures to ensure DTCs are no longer present.

NOTE: Always check for EVAP emission system DTCs prior to performing this test. See QUICK TEST in SELF-DIAGNOSTICS - VILLAGER article.

1) Check EVAP Emission System For Blockage Between Fuel Tank & Water Separator

Turn ignition off. Disconnect EVAP canister purge line between fuel tank and vacuum cut valve at fuel tank. Blow air into EVAP purge line. Ensure air flows freely from water separator. If air flows freely, check and repair fuel tank lines for blockage. Retest system for normal operation. If air does not flow freely, go to next step.

NOTE: Leave vacuum cut by-pass valve connected to vacuum cut valve.

2) Check For Blockage Of Vacuum Cut Valve
Disconnect EVAP canister purge line between EVAP canister and vacuum cut valve from EVAP canister. Blow air into EVAP purge line. Ensure air flows freely through vacuum cut valve toward canister, but not in the other direction. If air flows freely in one direction only, go to next step. If air does not flow freely in one direction only, replace vacuum cut valve. Retest system for normal operation.

3) Check Water Separator

Remove water separator. Blow air into water separator. If air flows freely, go to next step. If air does not flow freely, replace water separator. Retest system for normal operation.

4) Check EVAP Canister Vent Control Solenoid

Blow air into EVAP canister vent control solenoid. If air flows freely, go to next step. If air does not flow freely, replace EVAP canister vent solenoid. Retest system for normal operation.

5) Check EVAP Canister For Water Saturation

Remove EVAP canister with canister vent control valve attached. Hold EVAP canister so vacuum ports point downward. If water drains from EVAP canister, replace canister and water separator. Retest system for normal operation. If water does not drain from EVAP canister, go to next step.

6) Weigh EVAP Canister

Weigh EVAP canister with canister vent control solenoid attached. If EVAP canister weighs more than 4 lbs. (1.8 kg), replace EVAP canister and water separator. Retest system for normal operation. If EVAP canister weighs 4 lbs. (1.8 kg) or less, reconnect all disconnected components. Perform EVAP EMISSIONS SYSTEM LEAK TEST . If system passes leak test, perform EVAP EMISSION REPAIR VERIFICATION DRIVE CYCLE .