Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the ABS under different conditions.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If the concern remains after the inspection, connect New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the CJB and select the vehicle to be tested from the NGS menu. If NGS Tester does not communicate with the vehicle:
- Check that the program card is correctly installed.
- Check the connections to the vehicle.
- Check the ignition switch position.

4. If NGS Tester still does not communicate with the vehicle, refer to the New Generation STAR Tester Manual.
5. Retrieve the anti-lock brake control module Diagnostic Trouble Code (DTC).
6. If the DTCs retrieved are related to the concern, go to the Anti-Lock Brake Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Descriptions
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures