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Home >> Mazda >> 1999 >> B2500 TL, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics - EEC-V - 6.8L (99S E Series & 99S F350 To F550)) >> System Tests (Evaporative Emissions) >> Test D: Hiss When Opening Fuel Cap >> Diagnostic Aids

Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1999 Mercury Tracer, 1999 Mercury Sable, 1999 Mercury Mystique, 1999 Mercury Mountaineer, and 1999 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

Enter this test only when all steps under QUICK TEST have been successfully completed and hiss still exists when fuel cap is opened or if directed here from another test or chart.

  1. Testing EVAP Canister, Canister Vent Solenoid Flow & Canister Vent Hose -  Connect Evaporative Emissions System Leak Tester (134-00056) or equivalent to fuel filler pipe. Pressurize system to 3.48 kPa (14 In. H2O). If pressure drops immediately, EVAP system is not blocked, go to step  6. On models equipped with a canister vent hose assembly, if pressure does not drop immediately, go to next step. On models equipped with canister vent solenoid, if pressure does not drop immediately, go to step  3. On all other models, if pressure does not drop immediately, go to step  4.

  2. Testing Canister Vent Hose Assembly For Blockage

    Disconnect canister vent hose assembly from EVAP canister. Pressurize system to 3.48 kPa (14 In. H2O). If pressure does not drop immediately, go to step  4. If pressure drops immediately, replace canister vent solenoid hose assembly. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS.

  3. Testing Canister Vent Solenoid For Blockage

    Remove canister vent solenoid. Pressurize system to 3.48 kPa (14 In. H2O). If pressure does not drop immediately, go to next step. If pressure drops immediately, replace canister vent solenoid. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS.

  4. Testing EVAP Canister

    Disconnect EVAP canister tube from fuel tank at "F" fitting from EVAP canister. Pressurize system to 3.48 kPa (14 In. H2O). If pressure does not drop immediately, go to next step. If pressure drops immediately, replace EVAP canister. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS.

  5. Testing EVAP Canister Tube Or Fuel Vapor Vent Valve

    Disconnect fuel vapor valve assembly from EVAP canister tube. Pressurize system to 3.48 kPa (14 In. H2O). If pressure drops immediately, replace EVAP canister tube and/or fuel vapor valve tube between fuel tank and EVAP canister and bracket assembly. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS. If pressure does not drop immediately, replace fuel vapor valve(s) or assembly. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS.

  6. Testing For Blockage Between EVAP Canister Purge Valve & Fuel Tank

    Remove fuel tank fuel vapor hose from EVAP canister purge valve. Turn ignition switch to ON position. On models with a canister vent solenoid, using scan tool, close canister vent solenoid. Select OUTPUT TEST MODE, FTP and VPID. Select ALL OFF mode. Press START button on scan tool to close canister vent solenoid. On models without canister vent solenoid, plug canister vent hose assembly or plug canister vent cap. Pressurize system to 3.48 kPa (14 In. H2O). If pressure does not drop immediately, replace fuel vapor hose. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS. If pressure drops immediately, system has passed. Reconnect all components. On models with a canister vent solenoid, perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS. On models without canister vent solenoid, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES  under ADDITIONAL SYSTEM FUNCTIONS.
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