P0446

DTC P0446
Purge cannister vent valve functionality fault Drive cycle C:Signal out of range - below minimum.

Possible causes by suggested order of priority:
^ Cannister vent seal valve fault - stuck closed or blocked.
^ Purge cannister blocked.
^ Cannister purge valve fault - sticking open.
^ Fuel tank pressure sensor fault - inaccurate.

Cannister Vent Seal Valve Fault - Stuck Closed Or Blocked.
CHECK THE FOLLOWING:
^ Disconnect vent seal valve from purge can, Attempt to blow through vent seal valve.
^ Visual check of vent seal valve, check for blockage and charcoal contamination.
POSSIBLE FAULTS
^ Faulty vent seal valve.
^ Vent seal valve blocked with charcoal from cannister.

Purge Cannister Blocked.
CHECK THE FOLLOWING:
^ Purge can not blocked.
^ Visual check of purge can - charcoal not broken up (contamination in purge or vent valve).
POSSIBLE FAULTS
^ Faulty purge can.

Cannister Purge Valve Fault - Sticking Open.
CHECK THE FOLLOWING:
^ Disconnect purge valve. Attempt to suck air through closed valve using suitable tool.
^ Visual check of purge valve - check for charcoal contamination.
POSSIBLE FAULTS
^ Faulty purge valve.
^ Purge valve jammed open with charcoal from purge can.

Fuel Tank Pressure Sensor Fault - Inaccurate.
CHECK THE FOLLOWING:
^ Pressure sensor reads close to zero with filler cap removed.
^ If equipment available pressurize the tank and check that the reading on the sensor is accurate.
POSSIBLE FAULTS
^ Faulty fuel tank pressure sensor.