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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 P0442: Evaporative Emission (EVAP) System Small Leak Detected ("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. If any other EVAP system DTCs are stored as history DTC, diagnose applicable DTC. If other EVAP system related DTCs are not present, go to next step.
  3. Check EVAP system for loose, incorrect, defective or missing fuel tank filler cap. Check for improperly routed, kinked or damaged EVAP system purge lines or damaged EVAP system component. Repair or replace as necessary. After repairs, go to step  21. If no problem is found, go to next step.
  4. Using scan tool, perform EVAP system SERVICE BAY TEST. If vehicle passes test, see DIAGNOSTIC AIDS . If vehicle fails test, go to next step.
  5. Using scan tool, clear DTCs. Turn ignition off. Remove EVAP purge line from EVAP solenoid valve. Connect a hand-held vacuum pump to vacuum port to EVAP purge solenoid valve. Attempt to apply 10 in. Hg of vacuum. If specified vacuum can be obtained, go to next step. If specified vacuum cannot be obtained or held, go to step  15.
  6. Connect vacuum gauge to EVAP purge solenoid valve. Start and operate engine at idle. Using scan tool, command EVAP purge solenoid valve to 50 percent. sing vacuum pump, apply 5 in. Hg. If vacuum gauge reads 12 in. Hg or greater, go to step  8. If vacuum gauge does not read 12 in. Hg or greater, go to next step.
  7. Turn ignition off. Disconnect vacuum source from EVAP purge solenoid. Connect vacuum gauge to vacuum source. Start and operate engine at idle. If vacuum gauge reads 12 in. Hg or greater, go to step  15. If vacuum gauge does not read 12 in. Hg or greater, go to step  14.
  8. Turn ignition off. Reconnect EVAP purge line to EVAP purge solenoid. Lower fuel tank to gain access EVAP canister. Disconnect EVAP purge line from EVAP canister (line from EVAP purge solenoid valve). Connect vacuum pump to EVAP purge line from EVAP purge solenoid valve. Using vacuum pump, attempt to apply 5 in. Hg. If specified vacuum can be obtained, go to next step. If specified vacuum cannot be obtained, go to step  18.
  9. Turn ignition off. Disconnect fuel tank vapor line from EVAP canister. Plug EVAP canister port for fuel tank vapor line. Connect vacuum pump to EVAP purge port on EVAP canister. Turn ignition on. Using scan tool, EVAP vent valve on (closed). Using vacuum pump, attempt to apply 5 in. Hg. If specified, vacuum can be obtained, go to step  12. If specified vacuum cannot be obtained, go to next step.
  10. Leave system connected as in previous step. Disconnect vent line from EVAP vent valve. Plug vent line. Attempt to apply 5 in. Hg. If specified vacuum can be obtained, go to step  16. If specified vacuum cannot be obtained, go to next step.
  11. Check EVAP vent line from canister to EVAP vent valve for leaks. Repair as necessary. After repairs, go to step  21. If leak is not present, go to step  17.
  12. Turn ignition off. Remove hand-held vacuum pump. Reconnect EVAP canister purge and vent valve lines. Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP system service port. Ensure gauges are zeroed on diagnostic station. Using scan tool, command EVAP vent solenoid ON (closed). Continuously attempt to pressurize EVAP system by leaving EVAP pressure/purge diagnostic station control knob in PRESSURIZE position. Using Ultrasonic Leak Detector (J-41416), locate and repair EVAP system leak. It may be necessary to lower fuel tank to check connections at top of tank. After repairs, go to step  21. If leak is not present, go to next step.
  13. Check EVAP system for restrictions. Repair as necessary. After repairs, go to step  18. If no restrictions are found, go to step  16.
  14. Check EVAP system for restrictions. Repair as necessary. After repairs, go to step  21.
  15. Replace EVAP purge solenoid valve. After replacing solenoid valve, go to step  21.
  16. Replace EVAP vent valve. After replacing vent valve, go to step  21.
  17. Replace EVAP vapor canister. After replacing vapor canister, go to step  21.
  18. Replace EVAP line from EVAP purge solenoid valve to EVAP canister. After repairs, go to step  21.
  19. With EVAP system pressurized, compare EVAP pressure/purge diagnostic station pressure gauge reading to fuel tank pressure sensor reading on scan tool. Also, compare reading with system depressurized. If fuel tank pressure sensor indicate the actual amount of pressure in EVAP system, repeat step  3. If fuel tank pressure sensor pressure does not indicate the actual amount of pressure in EVAP system, go to next step.
  20. Replace fuel tank pressure sensor. After replacing sensor, go to next step.
  21. 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.
  22. 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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