P0449

DTC P0449
Purge cannister vent valve/DMTL power stage fault Drive cycle C:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ Purge vent seal valve open circuit.
^ Purge vent seal valve short circuit.
^ Purge vent seal valve driver (in ECM) stuck on.
^ Purge vent seal valve driver (in ECM) stuck off.
^ Fuse condition - F2 Engine Compartment Fusebox
^ Open circuit - C133/1 (NK) to C573/2 (NK).
^ Open circuit - C133/2 (SY) to C636/52 (SY).
^ Connector(s) C133,ECM C636 (B).

Purge Vent Seal Valve Open Circuit.
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Purge Vent Seal Valve Short Circuit.
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Purge Vent Seal Valve Driver (in ECM) Stuck ON.
CHECK THE FOLLOWING:
^ Purge vent seal valve driver (in ECM) stuck ON.
POSSIBLE FAULTS
^ Faulty ECM - Valve always energized (closed) when ignition ON.
^ Harness cable connected to C133/2 (SY) shorted to ground - Valve always energized (closed).

Note: Use multimeter to manually check components.

Purge Vent Seal Valve Driver (in ECM) Stuck OFF.
CHECK THE FOLLOWING:
^ Purge vent seal valve driver (in ECM) stuck OFF.
POSSIBLE FAULTS
^ Faulty ECM - Valve never energized (always open).
^ Harness cable connected to C133/2 (SY) shorted to battery positive - Valve never energized (always open).

Note: Use multimeter to manually check components.

Fuse Condition - F2 Engine Compartment Fusebox
POWER_DISTRIBUTION
^ Check for fuse not correctly inserted, fuse blown, fuse connections loose, damaged or corroded.
Certain diagnostics may also perform further checks to try and narrow down the fault, e.g. check if other circuits fed by the same fuse are also experiencing problems.

Open Circuit - C133/1 (NK) to C573/2 (NK).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit - C133/2 (SY) to C636/52 (SY).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Connector(s) C133,ECM C636 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.