P0443

DTC P0443
Cannister purge valve fault (power stage) Drive cycle C:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ Cannister purge valve open circuit.
^ Cannister purge valve short circuit.
^ Cannister purge valve driver (in ECM) stuck on.
^ Cannister purge valve driver (in ECM) stuck off.
^ Fuse condition - F2 Engine Compartment Fusebox
^ Open circuit - C152/2 (NK) to C570/1 (NK).
^ Open circuit - C152/1 (NR) to C636/3 (NR).
^ Connector(s) C152,ECM C636 (B).

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

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

Cannister Purge Valve Driver (in ECM) Stuck ON.
CHECK THE FOLLOWING:
^ Cannister purge valve driver (in ECM) stuck ON.
POSSIBLE FAULTS
^ Faulty ECM - Valve always energized (open) when ignition ON.
^ Harness cable connected to C152/1 (NR) shorted to ground - Valve always energized (open).

Note: Use multimeter to manually check components.

Cannister Purge Valve Driver (in ECM) Stuck OFF.
CHECK THE FOLLOWING:
^ Cannister purge valve driver (in ECM) stuck OFF.
POSSIBLE FAULTS
^ Faulty ECM - Valve never energized (always closed).
^ Harness cable connected to C152/1 (NR) shorted to battery positive - Valve never energized (always closed).

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 - C152/2 (NK) to C570/1 (NK).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit - C152/1 (NR) to C636/3 (NR).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Connector(s) C152,ECM C636 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.