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DTC P1441 - 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. Turn ignition on, with engine off. Using scan tool, command EVAP canister purge valve and EVAP vent solenoids on and off. If purge valve and vent solenoids click, go to next step. If purge valve and/or vent solenoid does not click, repair wiring or replace purge valve and/or vent solenoid as necessary.
  3. Remove fuel cap. Using scan tool, observe FUEL TANK VACUUM PRESSURE. If pressure is zero in. H2O, go to step 6). If pressure is more than zero in. H2O, go to next step.
  4. If battery has been disconnected, inspect and repair fuel tank pressure sensor. Replace fuel tank pressure sensor or repair related wiring as necessary. If battery has not been disconnected, go to next step.
  5. Reinstall fuel cap. Using scan tool, command EVAP vent solenoid on (closed). Zero EVAP pressure and vacuum gauges on EVAP Pressure/Purge Cart (J-41413 ). Connect EVAP pressure/purge cart to EVAP service port. Attempt to pressurize EVAP system to 5 in. H2O. Monitor pressure using gauge on EVAP pressure/purge cart. If pressure can be achieved, go to next step. If pressure cannot be achieved, go to step 8).
  6. Maintain EVAP system pressure at 5 in. H2O. Using scan tool, observe FUEL TANK VACUUM PRESSURE. If pressure reading is 4-6 in. H2O, go to next step. If pressure reading is not 4-6 in. H2O, inspect and repair fuel tank pressure sensor. Replace fuel tank pressure sensor or repair related wiring as necessary.
  7. Disconnect vacuum hose at EVAP canister purge valve (from throttle body). Connect a 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 released, go to step 9). If vacuum holds, go to next step.
  8. Check EVAP canister purge valve vacuum hoses for correct routing. If vacuum hoses are routed incorrectly, repair as necessary. Retest system. If vacuum hoses are routed correctly, check for an intermittent problem. See TESTS W/O CODES article.
  9. Replace EVAP canister purge valve. Retest system.
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