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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak/No Flow) >> Test Description

Test Description

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

  1. 3 -  Introducing smoke in 15 second intervals may allow smaller leak areas to be more noticeable. When the system is less pressurized, the smoke will sometimes escape in a more condensed manner.
  2. 5 -  This step verifies proper operation of the Fuel Tank Pressure (FTP) sensor.
  3. 6 -  A normal operating FTP sensor should increase to more than 5 in. H2O and stop between 6-7 in.H2O.
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