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Home >> Acura >> 1996 >> SLX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0441 - EVAP System Flow During Non-Purge
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DTC P0441 - EVAP System Flow During Non-Purge

  1. Perform On-Board Diagnostic (OBD) system check. See BASIC TESTING article. After performing OBD system check, go to next step.
  2. With the engine idling, observe "EVAP Vacuum Sw." while commanding the EVAP purge solenoid "ON" with the scan tool. If the "EVAP Vacuum Sw." displays "PURGE" with the EVAP purge solenoid commanded "ON", go to next step. If "PURGE" is not displayed, go to step  4 .
  3. With the ignition "ON" and the engine "OFF", review and record scan tool Failure Records data. Operate the vehicle within Failure Records conditions as noted. Using a scan tool, monitor "Specific DTC" info for DTC P0441 test runs. Note the test result. If the scan tool indicates DTC P0441 failed this ignition, go to next step. If the scan tool does not indicate failure, check for poor connection at PCM, or a damaged harness.
  4. Plug the vacuum line between the EVAP purge canister and EVAP vacuum switch. With the engine idling, observe "EVAP vacuum Sw." while commanding the EVAP purge solenoid "ON" with the scan tool. If the scan tool displays "Purge", go to next step. If "Purge" is not displayed, go to step  6 .
  5. Check the vacuum line to the canister for damage or improper connections. If a problem is found, verify repair. If no problem is found, go to step  14 .
  6. Turn ignition "OFF". Install a vacuum gauge between the EVAP purge solenoid and vacuum switch. With the engine idling, command the EVAP purge solenoid "ON" with scan tool. If the gauge indicates vacuum, go to next step. If vacuum is not indicated, go to step  8 .
  7. With ignition "OFF", disconnect the EVAP vacuum switch electrical connector. With ignition "ON", observe "EVAP Vacuum Sw." on the scan tool. If "Purge" is displayed on the scan tool, go to step  15 . If "Purge" is not displayed on the scan tool, go to step  9 .
  8. With ignition "OFF", disconnect the manifold vacuum source line from the purge solenoid and connect a vacuum gauge to it. Let the engine idle. If the gauge indicates vacuum greater than 5 in. of water, go to step  10 . If the vacuum gauge does not register greater than 5 in. of water, go to step 16 .
  9. With ignition "OFF" disconnect the PCM. With ignition "ON", check for a short to voltage in the EVAP vacuum switch input circuit. If a problem is found, verify repair and repair as necessary. If no problem is found, go to step  19 .
  10. With ignition "OFF", disconnect the EVAP purge solenoid electrical connector. Connect a test light between the EVAP purge solenoid connector terminals. With ignition "ON", using the scan tool, command the EVAP purge solenoid "ON". If test light comes on, go to step  17 . If test light does not come on, go to next step.
  11. With the ignition "OFF", disconnect the PCM. Connect a test light between the EVAP purge solenoid connector terminals. With the ignition "ON", jumper the EVAP purge solenoid driver circuit to ground at the PCM connector. If test light comes "ON", go to next step. If test light does not come on, go to step  13 .
  12. Check for a poor connection at the PCM. If a problem is found, verify the repair. If no problem is found, go to step  19 .
  13. Check if EVAP purge solenoid feed circuit is open or shorted to ground. Check EVAP purge solenoid driver circuit for open. If a problem is found, verify repair.
  14. Replace the EVAP canister. If the action is complete, verify repair.
  15. Replace the EVAP vacuum switch. If the action is complete, verify repair.
  16. Locate and repair the cause of no vacuum. If the action is complete, verify repair.
  17. Check for a poor connection at the EVAP purge solenoid. If a problem is found, verify the repair. If no problem is found, go to next step.
  18. Replace the EVAP purge solenoid. If the action is complete, verify the repair.
    19. NOTE: The replacement PCM must be programmed.
  19. Replace the PCM. If the action is complete, verify the repair.
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