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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> Diagnostic Tests >> DTC P0442: EVAP System - Small Leak >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. If scan tool indicates DTC P0443, P0449, P0452, or P0453 are also set, see DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT , DTC P0449: EVAP VENT SOLENOID CONTROL CIRCUIT , DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE  . If scan tool does not indicate DTCs P0443, P0449, P0452, or P0453 are also set, go to next step.
  3. See COMPONENT LOCATIONS . Inspect EVAP system for the following conditions:
    • Loose, missing or damaged service port Schrader valve.
    • Loose, incorrect, missing or damaged fuel fill cap.
    • A damaged EVAP canister purge valve.
    • Disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses.
    • Damaged EVAP canister vent valve or EVAP canister.

    If problem was found, repair as necessary. After repairs, go to step  6. If problem was not found, go to next step.

    4. NOTE: SERVICE BAY TESTS are available with Tech 2 scan tool and may not be available with after market scan tools.
  4. Using scan tool, capture and record FREEZE FRAME/FAILURE RECORDS data and clear DTCs. Using scan tool, perform SERVICE BAY TEST in SPECIAL FUNCTIONS menu. If scan tool indicates service bay test passed, see DIAGNOSTIC AIDS . If scan tool did not indicate service bay test passed, go to next step.
    5. NOTE: Always zero EVAP pressure and vacuum (in. H2O) gauges on EVAP pressure diagnostic station before proceeding with diagnosis.
  5. Install Fuel Fill Cap Adaptor (J 41415-40). Connect Pressure/Purge Diagnostic Station (J 41413) to fuel fill cap adaptor. Turn ignition on, engine off. Using scan tool, seal EVAP system. Using pressure/purge diagnostic station, continuously pressurize EVAP system to 15 in. H2O. Using Ultrasonic Leak Detector (J 41416), inspect for leaks in the following locations:
    • EVAP system purge pipe.
    • EVAP vapor pipe.
    • EVAP vent hose.
    • Fuel fill pipe/hose and fuel fill cap.
    • EVAP canister.
    • EVAP canister vent valve.
    • EVAP canister purge valve.
    • Fuel sender assembly and/or seal.
    • Fuel Tank Pressure (FTP) sensor seal.
    • Fill limiter vent valve, pressure relief valve, rollover valves, permanent EVAP pipes and/or fuel tank.

    If problem was found, repair as necessary. After repairs, go to next step. If problem was not found, see DIAGNOSTIC AIDS .

  6. Using scan tool, perform SERVICE BAY TEST in SPECIAL FUNCTIONS menu. If scan tool indicates service bay test passed, go to next step. If scan tool did not indicate service bay test passed, go to step  2.
  7. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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