Introduction

The procedures include all the specifications, instructions, and graphics needed to diagnose Mark IVG Antilock Braking System (ABS) problems. The diagnostic procedures are based on the failure condition or symptom being present at time of diagnosis.

Please follow the recommendations below when choosing your diagnostic path.
1. First make sure the DRBIII is communicating with the CAB. If the DRBIII displays a "No Response" condition, you must diagnose that first.
2. Read DTCs (Diagnostic Trouble Codes) with the DRBIII.
3. If no DTC's are present, identify the customer complaint.
4. Once the DTC or customer complaint is identified, locate the matching test in the Table of Contents and begin to diagnose the symptom.

An * placed before the symptom description indicated a customer complaint.

When repairs are required, refer to the appropriate service procedures for the proper removal and repair procedure. Diagnostic procedures change every year. New diagnostic systems may be added; carryover systems may be enhanced. READ THIS INFORMATION BEFORE TRYING TO DIAGNOSE A VEHICLE DIAGNOSTIC TROUBLE CODE. It is recommended that you review the entire information to become familiar with all new and changed diagnostic procedures.