Section 68 (Engine Controls - Self-Diagnostics): Introduction
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) when a malfunction occurs, check for Powertrain Control Module (PCM) DTCs prior to testing an individual system or component. Perform QUICK TEST procedures. The self-diagnostic system can be accessed using an OBD-II compliant scan tool. If no DTCs are present, perform SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - VILLAGER article to diagnose driveability problems existing when a hard fault code is not present.