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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 P1441 - EVAP System Flow During Non-Purge >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Turn ignition on, engine off. Using scan tool, read EVAP VACUUM SE. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to step 12).
  3. Start and warm engine to normal operating temperature. Using scan tool, read EVAP VACUUM SW display while commanding. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to step 5).
  4. Turn ignition on, engine off. Using scan tool, read and record FAIL RECORD data. Operate vehicle within conditions noted in FAIL RECORDS conditions as noted. Monitor STATUS THIS IGN for DTC P1441. If scan tool displays DTC P1441 FAILED THIS IGN, go to next step. If scan tool does not display DTC P1441 FAILED THIS IGN, see DIAGNOSTIC AIDS.
  5. Disconnect EVAP purge solenoid harness connector. Allow engine to idle. Read EVAP VACUUM SW. on scan tool. If scan tool displays NO PURGE, go to next step. If scan tool does not display NO PURGE, go to step 7).
  6. Turn ignition off. Disconnect PCM harness connector. Check EVAP purge solenoid driver circuit for short to ground. If short to ground is found, repair as necessary. After repairs, go to step 17). If circuit is okay, go to step 16).
  7. Leave EVAP purge solenoid harness connector disconnected. Disconnect vacuum signal hose from EVAP purge vacuum switch. Connect a vacuum gauge (H2O type) to signal hose. Allow engine to idle. If vacuum gauge reads 5 in. H2O or greater, go to next step. If vacuum gauge reads less than 5 in. H20, go to step 10).
  8. Check for incorrect vacuum hose routing or switched vacuum lines at EVAP purge solenoid. If a problem is found, go to step 17). If no problem is found, go to next step.
  9. Replace EVAP purge solenoid. After replacing EVAP solenoid, go to step 17).
  10. Check EVAP purge hose for restriction between EVAP canister and vacuum switch. If restrictions is found, repair as necessary. After repairs, go to step 17). If no restriction is found, go to next step.
  11. Check fuel tank vapor line for restriction between EVAP canister and fuel tank. If restriction is found, repair as necessary. After repairs, go to step 17). If no restriction is found, go to step 15).
  12. Disconnect EVAP vacuum switch harness connector. Connect a jumper wire across vacuum switch harness connector terminals. If scan tool displays NO PURGE, go to step 14). If scan tool does not display NO PURGE, go to next step.
  13. Check EVAP vacuum switch signal circuit for open or short to ground between EVAP vacuum switch and PCM. Check for open EVAP vacuum switch ignition feed circuit. Check for faulty signal circuit connection at EVAP vacuum switch. If problem is found, go to step 17). If no problem is found, go to step 16).
  14. Check for faulty connection at EVAP vacuum switch. If faulty connection is found, repair as necessary. After repairs, go to step 17). If connection is okay, go to next step.
  15. Replace EVAP vacuum switch. After replacing switch, go to step 17).
  16. Replace PCM. Replacement PCM requires special equipment for programming procedures. After replacing PCM, go to next step.
  17. Read and record FAIL RECORDS data for DTC P1441. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tools displays DTC P1441 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1441 FAILED THIS IGN, repair is complete.
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