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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 P1441: EVAP System Flow During Non-Purge >> Test Description

Test Description

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.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2 -  This step inspects for a leaking EVAP purge solenoid.
  2. 4 -  Removing the fuel fill cap will equalize the pressure inside the tank with atmospheric pressure. At zero in. H2O, the FTP sensor should be about 1.5 volts. If sensor is not, there is a concern with the sensor or related wiring.

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