Self-Diagnostic System
WARNING: This page is about a different car, the 2003 Mercury Sable, 2003 Ford Taurus, 2002 Mercury Sable, and 2002 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Using NGS tester, perform Powertrain Control Module (PCM) self-test. If any DTCs exist, perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs are present, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.