P0448

Diagnostic Chart:

Schematic:

The EVAP purge valve allows fresh outside air to enter the canister during purge modes. The vent solenoid is closed only while the EVAP diagnostic runs. The voltage on the solenoid control circuit is monitored continuously. If the voltage should remain above an upper threshold, this DTC will set.

DTC PARAMETERS
DTC P0445 will set when:
^ Battery Voltage is between 7.5 and 15 volts
^ Engine speed greater than 40 rpm
^ A low voltage condition exists on the control circuit

DTC P0448 is a (type B) DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use the Scan tool to monitor the actual EVAP purge solenoid with engine running.

Wiggling wires while monitoring the EVAP vent solenoid may locate the area where a short voltage exists.