P0448

DTC P0448
Purge cannister vent valve/DMTL power stage fault Drive cycle C:Signal out of range - below minimum.

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.
- Check resistance > 1M Ohm

Purge vent seal valve short circuit.
- Check resistance < 5.0 Ohm

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).
- 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).
- Use multimeter to manually check components.

Fuse condition - F2 Engine Compartment Fusebox
- 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. Eg Check if other circuits fed by the same fuse are also experiencing problems

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

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

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