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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0442: EVAP System - Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. If DTC P0443 or DTC P0449 is also set, see DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT  or DTC P0449: EVAP CANISTER VENT SOLENOID CONTROL CIRCUIT  . If DTC P0443 or DTC P0449 is not set, go to next step.
  3. Inspect EVAP system for the following conditions. Check for loose, missing or damaged service port Schrader valve. Check for loose, incorrect, missing or damaged fuel filler cap. Check for damaged EVAP canister purge valve. Raise and support vehicle. Check for disconnected, improperly routed, kinked or damaged EVAP pipes and hoses. Check for damaged EVAP canister vent valve. EVAP canister vent valve is located near fuel tank. Check for damaged EVAP canister. EVAP canister is located near fuel tank. If any problems are found, repair as necessary. After repairs, go to  7. If no problems are found, go to next step.
  4. Using scan tool, capture and record the Fail Record data and clear DTCs. Perform the Service Bay Test using scan tool. Does scan tool indicate that the Service Bay Test passed? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
  5. Remove fuel filler cap. Install Fuel Tank Cap Adapter (J-41415). Connect EVAP Pressure/Purge Station (J-41413). Install vehicle fuel filler cap to fuel fill cap adapter. Zero pressure and vacuum gauges on EVAP pressure/purge station. Turn ignition on. Using scan tool, seal EVAP system. Using EVAP pressure/purge diagnostic station, pressurize system to 5 in. H2O. Rotate EVAP pressure/purge diagnostic station rotary switch to OFF/HOLD position. Monitor pressure gauge for one minute. If pressure stays at 5 in. H2O, go to DIAGNOSTIC AIDS . If pressure does not stay at 5 in. H2O, go to next step.
  6. Remove fuel filler cap. Install Fuel Tank Cap Adapter (J-41415). Connect EVAP Pressure/Purge Station (J-41413). Install vehicle fuel filler cap to fuel fill cap adapter. Zero pressure and vacuum gauges on EVAP pressure/purge station. Turn ignition on. Using scan tool, seal EVAP system. Using EVAP pressure/purge diagnostic station, continuously pressurize system to 15 in. H2O. Using Ultrasonic Leak Detector (J-41416) check EVAP system for leaks. Carefully leak test all EVAP system hoses, tubes and connections. It may be necessary to partially lower fuel tank to inspect components located in upper portion of fuel tank. If any leaks are found, repair as necessary. After repairs, go to next step. If no problems are found, see DIAGNOSTIC AIDS .
  7. With a scan tool, capture and record the Fail Record data and clear the DTCs. Perform Service Bay Test using scan tool. Does scan tool indicate that the Service Bay Test passed? If yes, go to next step. If no, go to step  5.
  8. Using scan tool, check for any other DTCs that are set. If no other DTCs are set, system is okay. If any other DTCs are set, repair DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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