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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0446: Evaporative Emission Vent System Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Check for additional DTCs. If DTC P0443, P0449, P0452, or P0453 are also set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If additional DTCs are not set, go to next step.
  3. Check for loose, kinked or damaged EVAP purge and tank vent lines. Check for damaged EVAP system components. Repair as necessary. After repairs, go to step  13. If no problems were found, go to next step.
  4. Disconnect purge line from EVAP purge solenoid. EVAP purge solenoid is located on left side of engine next to cylinder No. 3 fuel injector. Turn ignition on and monitor FTP sensor parameter. If FTP sensor is approximately zero in. H2O, go to next step. If FTP sensor is not approximately zero in. H2O, go to step  8.
    NOTE: The following steps require EVAP Pressure/Purge Diagnostic Station (J 41413) and Fuel Fill Cap Adaptor (J 41415). Always zero EVAP pressure and vacuum in H2O gages on EVAP pressure diagnostic station before proceeding with diagnosis.
  5. Turn ignition off. Reconnect all previously disconnected components. Connect EVAP pressure/purge diagnostic station and fuel fill cap adapter. Turn ignition on. Using scan tool, command EVAP vent solenoid on. Pressurize system to 5 in. H2O using EVAP pressure/purge diagnostic station. Rotate rotary switch to OFF/HOLD position. Using scan tool, command EVAP vent solenoid off. If EVAP pressure drops to approximately zero in. H2O, go to DIAGNOSTIC AIDS . If EVAP pressure does not drop to approximately zero in. H2O, go to next step.
  6. Monitor FTP sensor pressure on scan tool. Disconnect EVAP vent hose from EVAP vent solenoid. See Figure. If FTP sensor pressure is -0.5 to +0.5 in. H2O, go to step  10. If FTP sensor pressure is not -0.5 to +0.5 in. H2O, go to next step.
  7. Monitor FTP sensor pressure on scan tool. Disconnect EVAP vent hose from EVAP canister. If FTP sensor pressure is approximately zero in. H2O, go to step  13. If FTP sensor pressure is not approximately zero in. H2O, go to step  11.
  8. Monitor FTP sensor voltage on scan tool. If voltage is more than 4.3 volts, go to DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT HIGH VOLTAGE . If voltage is less than 4.3 volts, go to next step.
  9. Check for poor connections at FTP sensor. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  12.
  10. Replace EVAP vent solenoid. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to step  14.
  11. Replace EVAP canister. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to step  14.
  12. Replace FTP sensor. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacing sensor, go to step  14.
  13. Repair blocked EVAP vent hose. After repairs, go to next step.
  14. Turn ignition on. Using scan tool, command EVAP vent solenoid on. Pressurize system to 5 in. H2O using EVAP pressure/purge diagnostic station. Rotate rotary switch to OFF/HOLD position. Using scan tool, command EVAP vent solenoid off. If EVAP pressure decreases, go to next step. If EVAP pressure does not decrease, go to step  3.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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