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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 86 (ENGINE CONTROLS SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0443: EVAP PURGE VALVE CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition ON, with engine OFF. With a scan took, command the EVAP purge valve to 50 percent, and then to 0 percent. Do you hear or feel a clicking from the EVAP purge valve when it is commanded to 50 percent? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Turn ignition ON, with engine OFF. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition OFF. Disconnect the EVAP purge valve harness connector. Turn ignition ON, with engine OFF. Probe the ignition voltage circuit at the EVAP purge valve harness connector with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  11.
  5. Connect a test light between the control circuit and the ignition voltage circuit of the EVAP purge valve harness connector. Command the EVAP purge valve to 0 percent with a scan tool. Is the test light illuminated? If yes, go to step  8. If no, go to next step.
  6. Command the EVAP purge valve to 50 percent with a scan tool. Does the test light illuminate or pulse when the EVAP purge valve is commanded to 50 percent? If yes, go to step  9. If no, go to next step.
  7. Test the control circuit of the EVAP purge valve for an open or short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the control circuit of the EVAP purge valve for a short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  9. Test for an intermittent and/or poor connections at the EVAP purge valve. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Test for an intermittent and/or poor connections at the control module. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the open or short to ground in the ignition 1 voltage circuit. Replace the fuse if necessary. Did you complete the repair? If yes, go to step  14.
  12. Replace EVAP purge valve. See EVAP CANISTER PURGE VALVE under SOLENOIDS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to step  14.
  13. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  14. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle ? If yes, go to step  2. If no, go to next step.
  15. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, 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.