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Pinpoint Test 1: Hiss When Opening Fuel Cap

PINPOINT TEST 1: HISS WHEN OPENING FUEL CAP

PINPOINT TEST 1 HISS WHEN OPENING FUEL CAP
STEP INSPECTION ACTION
1 TEST FOR EVAP CANISTER, CANISTER VENT SOLENOID AND CANISTER VENT HOSE ASSEMBLY BLOCKAGE
  • Connect the Evaporative Emission System Leak Tester to the fuel filler cap.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes The EVAP system has passed the EVAP canister and bracket assembly blockage test. Go to step 6.
No For vehicles equipped with a canister vent hose assembly, Go to next step.
For vehicles equipped with a canister vent solenoid, Go to step 3.
For all others,Go to step 4.
2 TEST FOR CANISTER VENT HOSE ASSEMBLY BLOCKAGE
  • Disconnect the EVAP canister vent hose assembly from the EVAP canister.
  • Connect the Evaporative Emission System Leak Tester to the fuel filler pipe.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes INSTALL a new EVAP canister vent solenoid vent hose assembly. CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
No Go to step 4.
3 TEST FOR CANISTER VENT SOLENOID BLOCKAGE
  • Remove the canister vent solenoid from the EVAP canister.
  • Connect the Evaporative Emission System Leak Tester to the fuel filler pipe.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes INSTALL a new canister vent solenoid. See EVAPORATIVE EMISSION CANISTER VENT SOLENOID . CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
No Go to next step.
4 TEST FOR EVAP CANISTER BLOCKAGE
  • Disconnect the EVAP canister tube (from the fuel tank) at the F-fitting from the EVAP canister.
  • Connect the Evaporative Emission System Leak Tester to the fuel filler pipe.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes INSTALL a new EVAP canister. See EVAPORATIVE EMISSION CANISTER . CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
No Go to next step.
5 TEST FOR EVAP CANISTER TUBE OR FUEL VAPOR VENT VALVE ASSEMBLY BLOCKAGE
  • Disconnect the fuel vapor vent valve assembly from the EVAP canister tube.
  • Connect the Evaporative Emission System Leak Tester to the fuel filler pipe.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes INSTALL a new EVAP canister tube and/or fuel vapor tube(s) between the fuel tank and the EVAP canister and bracket assembly. CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
No INSTALL a new fuel vapor vent valve(s) or assembly. CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
6 TEST FOR BLOCKAGE BETWEEN THE EVAP VAPOR MANAGEMENT VALVE AND THE FUEL TANK
  • Remove the fuel vapor hose (from the fuel tank) at the EVAP vapor management valve.
  • Connect the Evaporative Emission System Leak Tester to the fuel filler pipe.
  • Key ON, Engine OFF (KOEO).
  • For vehicles equipped with a canister vent solenoid, close the canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE  .
  • For vehicles without a canister vent solenoid, plug the canister vent hose assembly or plug the canister vent cap.
  • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
  • Does the pressure drop immediately? 
 Yes The EVAP system has passed all the blockage tests. RECONNECT all components.
For vehicles equipped with a canister vent solenoid, CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
No INSTALL a new fuel vapor hose. CARRY OUT the evaporative emission system leak test. See EVAPORATIVE EMISSION SYSTEM LEAK TEST  . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. See EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  .
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