SOME 2016-2017 FOCUS VEHICLES EQUIPPED WITH A 1.0L GASOLINE TURBO DIRECT INJECTION (GTDI) ENGINE AND BUILT ON OR BEFORE 18-JAN-2017 MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P04DB (CRANKCASE VENTILATION SYSTEM DISCONNECTED) STORED IN POWERTRAIN CONTROL MODULE (PCM) MEMORY. FOLLOW THE SERVICE PROCEDURE STEPS TO CORRECT THE CONDITION.