Diagnostic Aids

DTC is most likely caused by a faulty EVAP canister purge solenoid valve. An intermittent DTC may be caused by a faulty EVAP canister that has released carbon particles and resulted in EVAP canister purge solenoid valve leakage. DTC is most likely caused by a faulty EVAP pressure switching solenoid. Check EVAP pressure switching solenoid for faulty connections and erratic operation. Check for problems in any of the following components or for any of the following conditions:

• Missing or leaking "O" rings at fuel vapor lines.
• Cranked or damaged EVAP canister.
• Damaged source vacuum line, EVAP purge line, EVAP vent hose or fuel tank vapor line.
• EVAP vent solenoid stuck open.
• EVAP service port valve leak.

Perform an inspection of all EVAP system components and vacuum hoses. See underhood vehicle emission control information label for component identification and vacuum hose routing.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.