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HOMESERVICE MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P1441: EVAP SYSTEM FLOW DURING NON-PURGEDIAGNOSTIC 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  . After performing OBD system check, go to next step.
  2. Turn ignition on, engine off. Using scan tool, check if DTC P0452, P0453 or P0460 is also set. If DTCs are set, diagnose affected DTC(s) first. If these DTCs are not set, go to next step.
  3. Turn ignition on, engine off. Using scan tool, command EVAP canister purge valve and vent solenoid on and off. If purge valve and vent solenoid click, go to next step. If purge valve and vent solenoid do not click, perform PCM diagnosis. See appropriate SYSTEM & COMPONENT TESTING article.
  4. Turn ignition off. Disconnect purge line from fuel tank at EVAP canister. Turn ignition on. Using scan tool, check fuel tank pressure sensor value. If fuel tank pressure sensor value is zero mm Hg, go to step  6 . If fuel tank pressure sensor value is not zero mm Hg, go to next step.
  5. Check for pinched, kinked or plugged purge line from fuel tank to EVAP canister. Repair as necessary. After repairs, go to step  12 . If purge line is okay, go to DTC P0452 or P0453 diagnosis.
  6. Zero pressure and vacuum gauges on EVAP Pressure/Purge Diagnostic Station (J-41413). Reconnect all EVAP hardware previously disconnected. Connect EVAP pressure/purge diagnostic station to EVAP service port. Using scan tool, command EVAP vent solenoid ON (closed). Using EVAP pressure/purge diagnostic station, attempt to pressurize EVAP system to 5 in. H2O. If specified pressure is achieved, go to next step. If specified pressure is not achieved, to step  8 .
  7. Maintain EVAP system pressure at 5 in. H2O. Using scan tool, observe FUEL TANK PRESSURE. If scan tool displays 5 in. H2O, go to next step. If scan tool does not display 12 mm Hg, go to DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT-LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT-HIGH VOLTAGE  diagnosis.
  8. Disconnect vacuum hose at EVAP canister purge valve (from throttle body). Connect a hand-held vacuum pump to EVAP canister purge valve vacuum source fitting. Apply 15 in. Hg vacuum. Using scan tool, command EVAP canister purge valve on. If vacuum is maintained, go to next step. If vacuum cannot be maintained, go to step  10 .
  9. Check EVAP canister purge valve vacuum hoses for correct routing. If vacuum hoses are routed incorrectly, go to step  11 . If vacuum hoses are routed correctly, see DIAGNOSTIC AIDS  .
  10. Replace EVAP canister purge valve. After replacing canister valve, go to step  12 .
  11. Correct EVAP vacuum hose routing. After repairs, go to next step.
  12. Disconnect purge line from fuel tank at EVAP canister. Start engine. Using scan tool, activate EVAP SEAL SYSTEM function to seal EVAP system. Connect purge line from fuel tank to EVAP canister. Operate engine at 2500 RPM while monitoring fuel tank pressure value on scan tool. If fuel tank pressure value is zero in. H2O or greater, go to next step. If fuel tank pressure value is not zero in. H2O or greater, repeat step  2 .
  13. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this diagnostic ran and passed, go to next step. If scan tool does not indicate that this diagnostic ran and passed, repeat step  2 .
  14. Check if additional DTCs are set. Diagnose affected DTC(s). 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.