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Home >> Pontiac >> 2003 >> Vibe Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics >> Diagnostic Tests >> DTC P0446: EVAP Vent System Performance >> Test Description

Test Description

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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