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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0442: Evaporative Emission System Small Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

  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 CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Check for additional DTCs. If DTCs P0443, P0446, P0449, P0452, P0453, P0461, P0462, P0463, or P1441 are also set, diagnose those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If additional DTCs are not set, 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  5. If no problem is found, go to next step.
    NOTE: The following steps require EVAP Pressure/Purge Diagnostic Station (J 41413) and Fuel Fill Cap Adaptor (J 41415). Always zero EVAP pressure and vacuum in H2O gages on EVAP pressure diagnostic station before proceeding with diagnosis.
  4. Connect EVAP pressure/purge diagnostic station and fuel fill cap adapter. Turn ignition on. Using scan tool, seal EVAP system. Pressurize system to 15 in. H2O using EVAP pressure/purge diagnostic station. Using Ultrasonic Leak Detector (J 41416), inspect for leaks in EVAP system purge pipe, vapor pipe, canister, vent hose/pipe, fuel fill pipe/hose and fuel fill cap, canister vent valve, canister purge valve, fuel sender assembly and/or seal, Fuel Tank Pressure (FTP) sensor seal, fill limiter vent valve, pressure relief valve, rollover valve, or fuel tank. See Figure. Repair or replace as necessary. After repairs, go to next step. If components are okay and no leak is found, go to DIAGNOSTIC AIDS .
  5. Remove and then reinstall fuel filler cap to relieve fuel tank pressure. Turn ignition on. Using scan tool, command the EVAP vent solenoid on. Pressurize the EVAP system to 5 in. H2O using EVAP pressure/purge diagnostic station. Place control knob to OFF/HOLD position. Monitor EVAP system pressure for 5 minutes. If EVAP system pressure holds, go to next step. If EVAP system pressure does not hold, go to step  4.
  6. 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.
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