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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance ("F" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. 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  12. If no problems were found, go to next step.
  3. Using scan tool, perform SERVICE BAY TEST for EVAP system. If vehicle passes service bay test, fault is intermittent. See DIAGNOSTIC AIDS . If vehicle does not pass the service bay test, go to next step.
  4. Turn ignition off. Lower fuel tank. Disconnect fuel tank vapor and EVAP purge line from EVAP vapor canister. Plug canister fitting for fuel tank vapor line. Connect a hand-held vacuum pump to EVAP purge line canister fitting. Turn ignition on. Using scan tool, command EVAP vent valve closed. Using vacuum pump, apply vacuum. If 5 in. Hg of vacuum can be obtained and held, go to step  7. If vacuum cannot be obtained and held, go to next step.
  5. Leave system connected. Disconnect vent line at EVAP vent valve. Plug vent line. Using vacuum pump, apply vacuum. If 5 in. Hg of vacuum can be obtained and held, go to step  9. If vacuum cannot be obtained and held, go to next step.
  6. Check EVAP vent line from canister to EVAP vent valve for restrictions. Repair as necessary. After repairs, go to step  13. If vent line is okay, go to step  10.
  7. Check fuel tank vapor line for restriction. Repair as necessary. After repairs, go to step  13. If vapor line is okay, go to next step.
  8. Install EVAP Pressure/Purge Diagnostic Station (J-41413) and Ultrasonic Leak Detector (J-41416). Ensure gauges on test equipment is zeroed before starting test. Turn ignition off. Remove hand-held vacuum pump. Reconnect EVAP vapor canister purge and tank vent lines. Connect diagnostic station to EVAP system service port. Using scan tool, command EVAP vent valve closed. Continuously attempt to pressurize EVAP system by leaving EVAP Pressure/Purge Diagnostic Station control knob to PRESSURIZE position. If fuel tank pressure sensor indicates the actual amount of vacuum in EVAP system, go to step  3. If fuel tank pressure sensor does not indicate actual amount of vacuum in EVAP system, go to step  11.
  9. Replace EVAP vent valve. After replacing valve, go to step  13.
  10. Replace EVAP vapor canister. After replacing canister, go to step  13.
  11. Replace fuel tank pressure sensor. After replacing sensor, go to step  13.
  12. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter this DTC. Operate vehicle within conditions required to set DTC. If scan tool indicates RAN AND PASSED, go to next step. If scan tool does not indicate RAN AND PASSED, return to step  2.
  13. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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