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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTING & ENGINE COMPONENT TESTINGEMISSION SYSTEMS & SUBSYSTEMSFUEL EVAPORATIONEVAP CONTROL SYSTEM DIAGNOSIS (2.2L & 2.4L)
2000 Buick Century Custom

EVAP Control System Diagnosis (2.2L & 2.4L)

2000 Buick Century CustomSECTION EVAP Control System Diagnosis (2.2L & 2.4L)
NOTE: The following procedure does not apply to 2.2L Saturn.
  1. Install scan tool. Turn ignition on, with engine off. Retrieve DTCs. If no DTCs are set, go to next step. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  2. Using scan tool, command EVAP canister purge valve and EVAP canister vent solenoid on and off. If both purge valve and vent solenoid click when toggled on and off, go to next step. If either purge valve or vent solenoid do not click when toggled on and off, perform PCM output diagnosis. See PCM OUTPUT DIAGNOSIS (2.2L & 2.4L)  under COMPUTERIZED ENGINE CONTROLS.
  3. Turn ignition off. Disconnect vapor line from fuel tank at EVAP canister. Turn ignition on, with engine off. Using scan tool, observe fuel tank pressure. If scan tool displays -1.28-1.28 in. H2 O, go to next step. If scan tool does not display -1.28-1.28 in. H2 O, perform DTC P0452 or DTC P0453 test. See appropriate SELF-DIAGNOSTICS article.
  4. Reconnect vapor line from fuel tank to EVAP canister. Install EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port and zero gauges. Using scan tool, command EVAP vent solenoid on. Using diagnostic station, pressurize EVAP system to 5 in. H2 O. Using scan tool, observe fuel tank pressure. If scan tool displays 3.85-8.99 in. H2 O, go to next step. If scan tool does not display 3.85-8.99 in. H2 O, perform DTC P0452 or DTC P0453 test. See appropriate SELF-DIAGNOSTICS article.
  5. Observe EVAP system pressure on diagnostic station. Using scan tool, command EVAP canister vent solenoid off. If EVAP system pressure decreases to zero in. H2 O within 5 seconds, go to next step. If EVAP system pressure does not decrease to zero in. H2 O within 5 seconds, perform DTC P0446 test. See appropriate SELF-DIAGNOSTICS article.
  6. Disconnect vapor line from fuel tank at EVAP canister. Start engine. Using scan tool output test function, select SEAL SYSTEM and seal EVAP system. Reconnect vapor line from fuel tank to EVAP canister. Increase engine speed to 1500 RPM. Using scan tool, observe fuel tank pressure. If fuel tank pressure does not decrease, go to next step. If fuel tank pressure is decreasing, perform DTC P1441 test. See appropriate SELF-DIAGNOSTICS article.
  7. Using scan tool, command EVAP canister vent solenoid and EVAP canister purge valve on. Increase engine speed to 1500 RPM. Using scan tool, observe fuel tank pressure. If fuel tank pressure is decreasing, system is okay. If fuel tank pressure does not decrease, perform DTC P0440 test. See appropriate SELF-DIAGNOSTICS article.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.