Diagnostic Aids

Check EVAP canister for damage or blockage. Check vacuum hoses for damage or incorrect routing. Check for restrictions in fuel vapor line, purge hose, or EVAP canister vent. Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal connection. Inspect wiring harness for damage. If connections and harness appear okay, observe EVAP VACUUM SW display on scan tool while moving all related harnesses and connectors. A change in scan tool display indicates fault location. If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.