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Home >> Chevrolet >> 1997 >> Venture LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0441 - EVAP System Incorrect Purge Flow >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, select ENG 1 data list. Observe EVAP VACUUM SW while commanding EVAP purge solenoid on. If scan tool displays PURGE, go to next step. If scan tool does not display PURGE, go to step 4).
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within the conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0441 until DTC P0441 test runs. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Plug vacuum line between EVAP purge canister and EVAP vacuum switch. Start engine and allow it to idle. Using scan tool, observe EVAP VACUUM SW while commanding EVAP purge solenoid on. If PURGE is indicated, go to next step. If PURGE is not indicated, go to step 6).
  5. Check vacuum line to EVAP canister for damage or improper connections. Repair as necessary. After repair is completed, go to step 20) If vacuum line is okay, go to step 14).
  6. Turn ignition off. Install a vacuum gauge between EVAP purge solenoid and vacuum switch. Start engine and allow it to idle. Using scan tool, command EVAP purge solenoid on. If vacuum is indicated, go to next step. If vacuum is not indicated, go to step 8).
  7. Turn ignition off. Disconnect EVAP vacuum switch connector. Turn ignition on. Observe EVAP VACUUM SW on scan tool. If PURGE is indicated, go to step 15). If PURGE is not indicated, go to step 9).
  8. Turn ignition off. Install vacuum gauge in vacuum source line to EVAP purge solenoid. Start engine and allow it to idle. If vacuum is greater than 12 in. Hg, go to step 10). If vacuum is 12 in. Hg or less, go to step 16).
  9. Turn ignition off. Disconnect PCM. Turn ignition on. Check for a short to voltage in EVAP vacuum switch input circuit. Repair as necessary. After repair is completed, go to step 20) If circuit is okay, go to next step.
  10. Turn ignition off. Disconnect EVAP purge solenoid connector. Connect a test light between EVAP purge solenoid harness connector terminals. Turn ignition on. Command EVAP purge solenoid on. If test light is on, go to step 17). If test light is off, go to next step.
  11. Turn ignition off. Disconnect PCM connector. Connect a test light between EVAP purge solenoid harness connector terminals. Turn ignition on. Connect a jumper wire between ground and EVAP canister purge driver circuit terminal at PCM connector. If test light is on, go to next step. If test light is off, go to step 13).
  12. Disconnect and inspect PCM connector for damaged pins, corrosion and loose wires. Repair as necessary. After repair is completed, go to step 20). If connector is okay, go to step 19).
  13. Check for an open in purge solenoid driver circuit. Also, check for an open or short to ground in EVAP purge solenoid ignition feed circuit. Repair as necessary. After repair is completed, go to step 20).
  14. Replace EVAP canister. After repair is completed, go to step 20).
  15. Replace defective EVAP vacuum switch. After repair is completed, go to step 20).
  16. Locate and repair cause of low on no vacuum. After repair is completed, go to step 20).
  17. Check for poor connection at EVAP purge solenoid. After repair is completed, go to step 20). If connector is okay, go to next step.
  18. Replace defective EVAP purge solenoid. After repair is completed, go to step 20).
  19. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  20. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0441. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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