LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  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 TESTS. After performing powertrain diagnostic system check, go to next step.
  2. If DTCs P0443, P0449, P0452 or P0453 are also set, diagnose those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTCs P0443, P0449, P0452 or P0453 are not set, go to next step.
  3. Check for loose, pinched or damaged EVAP purge and tank vent lines. Repair as necessary. After repairs, go to step  14. If no problems were found, go to next step.
  4. Using scan tool, perform EVAP system SERVICE BAY TEST. See SERVICE BAY TEST  under INSPECTION/MAINTENANCE PROCEDURES. If vehicle passes test, DIAGNOSTIC AIDS . If vehicle does not pass test, go to next step.
  5. Turn ignition off. Locate and disconnect vacuum line from EVAP purge valve. See Figure. Turn ignition on. Using scan tool, monitor FTP sensor reading. If FTP sensor pressure is zero in. H2O, go to next step. If FTP sensor pressure is not zero in.H2O, go to step  8.
  6. Turn ignition off. Reconnect any disconnected components. Remove fuel tank cap. Install Fuel Fill Cap Adapter (J 41415-40) to fuel filler neck. Connect EVAP Pressure/Purge Diagnostic Station (J 41413) to fuel fill cap adapter. Turn ignition on. Using scan tool, seal the EVAP system. Pressurize system to 5 in. H2O using EVAP pressure/purge diagnostic station. Disconnect EVAP vent hose from EVAP vent valve. See Figure. If pressure drops to zero in.H2O, go to step  9. If pressure does not drop to zero in. H2O, go to next step.
  7. Disconnect EVAP vent hose from EVAP canister. Using scan tool, monitor FTP sensor reading. If FTP sensor pressure is zero in. H2O, go to step  13. If FTP sensor pressure is not zero in. H2O, go to step  11.
  8. Using scan tool, monitor FTP sensor voltage. If FTP sensor voltage is more than 4.3 volts, go to DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT HIGH VOLTAGE . If FTP sensor voltage is less than 4.3 volts, go to next step.
  9. Check for poor connections at FTP sensor connector. See Figure. Repair as necessary. After repairs, go to step  14. If vapor line is okay, go to next step.
  10. Replace EVAP canister vent valve. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacement, go to step  14.
  11. Replace EVAP canister. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacement, go to step  14.
  12. Replace FTP sensor. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacement, go to step  14.
  13. Repair blockage in EVAP vent hose. After repairs, go to next step.
  14. Using scan tool, perform EVAP system SERVICE BAY TEST. See SERVICE BAY TEST  under INSPECTION/MAINTENANCE PROCEDURES. If vehicle passes test, go to next step. If vehicle fails test, 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.
scientia non olet · About LEMON Manuals