Evaporative Emissions System: Testing and Inspection

(_P0441_)
- The scan tool indicates Diagnostic Trouble Code (DTC) PO441: Evaporative Emission (EVAP) control system insufficient purge flow.

Description
By monitoring the vacuum of purge line with the EVAP purge flow switch, ECM (Engine Control Module) detects the EVAP control system insufficient purge flow.

Possible Cause
- EVAP Purge Control Solenoid Valve
- EVAP Purge Control Solenoid Valve Circuit
- EVAP Purge Flow Switch
- EVAP Purge Flow Switch Circuit
- EVAP control canister
- Throttle Body (purge port)
- Vacuum lines
- ECM













(_P1459_)
- The scan tool indicates Diagnostic Trouble Code (DTC) P1459: Evaporative emission (EVAP) purge flow switch P1459 malfunction.

Possible Causes
- EVAP purge flow switch
- EVAP purge flow switch Circuit
- EVAP purge control solenoid valve
- EVAP purge control solenoid valve circuit
- EVAP control canister
- Vacuum lines
- ECM