Theory Of Operation
| EVAP SYSTEM COMPONENTS | |
|---|---|
| CALLOUT | DESCRIPTION |
| 1 | Filter |
| 2 | ESIM Switch |
| 3 | Evaporative Canister |
| 4 | Fuel Tank Vent (Check Valve) |
| 5 | Control Valve |
| 6 | Inlet Check Valve |
| 7 | Fuel Tank Pressure Sensor |
| 8 | To Purge System |
| 9 | Fuel Fill Tube |
The Powertrain Control Module (PCM) detected that the Evap system was unable to achieve or maintain vacuum during the test period or the system was not able to close the ESIM switch when vacuum was present.