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HOMESERVICE MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0446: EVAP VENT SYSTEM PERFORMANCEDIAGNOSTIC PROCEDURES
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4

Diagnostic Procedures

2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4SECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check for DTCs. If DTC P0452, P0453 or P0461 is also set, diagnose affected DTC first. If these DTCs are not set, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, command EVAP canister purge and vent valve solenoids on and off. If purge and vent solenoids click on and off when commanded, go to next step. If purge and/or vent solenoid does not click, perform PCM diagnosis. See appropriate SYSTEM & COMPONENT TESTING article.
  4. Turn ignition off. Disconnect vapor line from fuel tank at EVAP canister. Turn ignition on, with engine off. Using scan tool, check fuel tank pressure sensor value. If fuel tank pressure is zero mm Hg, go to step  6 . If fuel tank pressure is not zero mm Hg, go to next step.
  5. Turn ignition off. Check EVAP vapor line from fuel tank to EVAP canister for pinched, kinked or plugged line. Repair or replace as necessary. After repairs, go to step  12 . If line is okay, diagnose using DTC P0452 or P0453 diagnostic tests. See DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE  .
  6. Reconnect all disconnected EVAP hardware. Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port. Using scan tool, command EVAP vent valve on (closed). Pressurize EVAP system to 5 in. H2O using diagnostic station. Observe fuel tank pressure on scan tool. If fuel tank pressure is 12 mm Hg, go to next step. If fuel tank pressure is not 12 mm Hg, diagnose using DTC P0452 or P0453 tests. See DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE 
  7. Maintain EVAP pressure at 5 in. H2O. Command EVAP vent solenoid off (open) while observing EVAP pressure gauge. If EVAP pressure return line is zero in. H2O within 5 seconds, see DIAGNOSTIC AIDS  . If EVAP pressure return line is not zero in. H2O within 5 seconds, go to next step.
  8. Disconnect large vent hose from EVAP canister marked AIR. Switch rotary switch on diagnostic station to PURGE position. Start and warm engine to normal operating temperature. Observe vacuum gauge for 5 seconds while holding engine speed to 2500 RPM. If vacuum reading remains less than 10 in. H2O, go to next step. If vacuum reading does not remain less than 10 in. Hg, go to step  11 .
  9. Turn ignition off. Check for kinked, pinched or blocked EVAP vent hose between EVAP canister and EVAP vent solenoid. Repair as necessary. After repairs, go to step  12 . If hose is okay, go to next step.
  10. Replace EVAP vent solenoid. After replacing solenoid, go to step  12 .
  11. Replace EVAP canister. After replacing canister, go to next step.
  12. Reconnect all disconnected EVAP hardware. Turn ignition on, with engine off. Using scan tool, command EVAP vent solenoid on (closed). Using EVAP pressure/purge diagnostic station, pressurize EVAP system to 5 in. H2O. Set rotary switch on pressure/purge diagnostic station to HOLD position. Observe EVAP pressure gauge. If pressure decreases to zero in. H2O within 5 seconds, go to next step. If pressure does not decrease to zero in. H2O within 5 seconds, repeat step  3 .
  13. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  3 .
  14. Using scan tool, check for additional undiagnosed DTCs. If additional DTCs are set, diagnose applicable DTCs. If no additional DTCs are set, system is okay.
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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.