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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0442: EVAP System - Small Leak Detected >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If carbon release is detected, see EVAPORATIVE EMISSION SYSTEM CLEANING in REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT .

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

To aid in locating an intermittent leak, use the Pressure/Purge Diagnostic Station (J-41413 EVAP) to pressurize the EVAP system. Move all EVAP system components while testing with the Ultrasonic Leak Detector (J-41416).

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