For 1990-2009 cars

Important: Review the Scan Tool operation in order to familiarize yourself with the system functions. Refer to the scan tool user manual.

### Visual/Physical Inspection

Inspect the DLC connector for obvious damage or conditions which could cause the symptom.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Scan Tool Does Not Power Up

• | Scan Tool Does Not Communicate with Components

• | Scan Tool Does Not Communicate with Electronic Brake Control Module

• | Scan Tool Does Not Communicate with Vehicle Control Module/Powertrain Control Module

• | Scan Tool Does Not Communicate with Sensing and Diagnostic Module