Test Description

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

1. 4  - This step verifies EVAP canister purge solenoid electrical operation.
2. 5  - This step tests EVAP canister purge solenoid function.
3. 8  - 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.
4. 9  - This step tests EVAP canister vent valve and hoses for a blockage or restriction. If vacuum does not drop to less than -10.0 in. H2O after 30 seconds, there is a faulty condition in EVAP vent system. EVAP vent portion of EVAP control system is diagnosed in DTC P0446.
5. 21  - 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.