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1.0 INTRODUCTION The procedures contained in this manual include all the specifications, manuals, and graphics Please follow the recommendations below when choosing your diagnostic path. 1. First make sure the DRBIII t is communicating with the CAB. If the DRBIII t displays a “No Response” condition, you must diagnose that 2. Read DTC’s (diagnostic trouble codes) with the DRBIII t. 3. If no DTC’s are present, identify the customer complaint. 4. Once the DTC or customer complaint is identi- fied, locate the matching test in the Table of All component location views are in Section 8.0. All connector pinouts are in Section 9.0. All sche- An asterisk (*) placed before the symptom de- scription indicates a concern with no associated When repairs are required, refer to the appropri- ate service manual for the proper removal and Diagnostic procedures change every year. New diagnostic systems may be added; carry over sys- After using this book, if you have any comments or recommendations, please fill out the form at the 1.1 SYSTEM COVERAGE This diagnostic procedure manual covers the an- tilock braking system (ABS), and the traction con- 1.2 SIX-STEP TROUBLESHOOTING Diagnosis of the controller antilock brake module is done in six basic steps: • verification of complaint • verification of any related symptoms • symptom analysis • problem isolation • repair of isolated problem • verification of proper operation 2.0 IDENTIFICATION OF Vehicles equipped with the Teves Mark 20e an- tilock brake system can be identified by the pres- The presence of the Traction Control system is indicated by the TRAC OFF switch on top of the 3.0 SYSTEM DESCRIPTION AND 3.1 TEVES MARK 20e SYSTEM The controller antilock brake module is used to monitor wheel speeds and to modulate (control) The Teves Mark 20e system uses a diagonal split hydraulic brake system. In the standard brake All vehicles equipped with ABS use Electronic Variable Brake Proportioning (EVPB) to balance 3.2 TRACTION CONTROL SYSTEM (TCS) The main purpose of traction control is to reduce wheel slip and maintain traction at the driven 1 GENERAL INFORMATION |