P0455

DTC P0455
Evaporative control system - large leak detected Drive cycle C:Signal out of range - below minimum.

Possible causes by suggested order of priority:
^ Fuel filler cap missing.
^ Disconnected hose.
^ Disconnected fuel tank pressure sensor.
^ Clogged hose.
^ Clogged fuel tank pressure sensor line.
^ Faulty Purge valve - does not open.
^ Fuel tank pressure sensor fault.

Fuel Filler Cap Missing.
CHECK THE FOLLOWING:
^ Check fuel filler cap is fitted correctly and not leaking.
POSSIBLE FAULTS
^ Faulty or missing fuel filler cap.

Disconnected Hose.
CHECK THE FOLLOWING:
^ Check all hose connections in evaporative loss system:
Hoses in fuel tank filler assembly.
Hoses connecting fuel tank filler assembly to purge cannister.
POSSIBLE FAULTS
^ Faulty hose or hose connection.

Disconnected fuel tank pressure sensor.
CHECK THE FOLLOWING:
^ Visual check of the pipe connecting fuel tank pressure sensor to fuel tank.
^ Monitor fuel tank pressure reading on real time data and rock vehicle to cause fuel slosh. Pressure reading should vary (Fuel tank must be nearly full).
POSSIBLE FAULTS
^ Fuel tank pressure sensor pipe disconnected.

Clogged Hose.
CHECK THE FOLLOWING:
^ Hose connecting fuel tank filler assembly to purge cannister not blocked.
POSSIBLE FAULTS
^ Clogged hose between Fuel tank and purge cannister.

Clogged Fuel Tank Pressure Sensor Line.
CHECK THE FOLLOWING:
^ Disconnect pipe connecting fuel tank pressure sensor to fuel tank, attempt to blow through pipe.
^ Monitor fuel tank pressure reading on real time data and rock vehicle to cause fuel slosh. Pressure reading should vary (Fuel tank must be nearly full).
POSSIBLE FAULTS
^ Fuel tank pressure sensor pipe blocked.

Faulty Purge Valve - Does Not Open.
CHECK THE FOLLOWING:
^ Visual check of purge valve for blockage or damage.
^ Check purge valve by substituting a known good unit.
POSSIBLE FAULTS
^ Purge valve blocked or jammed.

Fuel Tank Pressure Sensor Fault.
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.