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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0446: EVAP Vent System Performance >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. 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. 3  - This step verifies DTC P0446 is captured in freeze frame/failure record list. When multiple EVAP system DTCs are set, DTC stored in freeze frame/failure record is best diagnostic starting point.
  2. 28  - This step uses EVAP Purge/Seal function to test EVAP canister vent solenoid, pressure switching solenoid, and purge solenoid for correct operation. Using EVAP PURGE/SEAL function also tests for leaks by allowing the technician to seal the system and monitor FTP sensor.
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