Initial Inspection and Diagnostic Overview

1.Check for proper connections of Scan Tool to Data Link Connector (DLC).
2. Check for loose or missing terminals at DLC.
3. If all components are not accessible with a Scan Tool, then check for an open in TAN (800) wire between S227 and DLC terminal "M".
4. If a single component is not accessible with a Scan Tool, then check for an open in TAN (800) wire between S227 and affected component.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may he intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other system (Refer "Troubleshooting Procedures,"). Diagnostic Aids