| Detection Criteria | Threshold |
|---|---|
| Case 1: CCV stuck closed | |
| Fuel tank pressure when the CCV is opened after an EVAP leak check | Not changing |
| Case 2: EVAP VSV stuck closed | |
| Fuel tank pressure after the EVAP VSV is opened and manifold vacuum is introduced to the fuel tank | Not changing |
TYPICAL MALFUNCTION THRESHOLDS - P0446