ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING

TM 9-2320-303-24-1

ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING

THIS WORK PACKAGE COVERS

Introduction, Pretest Inspection, General Information, System Components, Diagnostics, Diagnostic and Testing Proce-

dure, Pro-link Screens, Wiring Diagrams

INITIAL SETUP

Tools and Special Tools - Continued

Maintenance Level

PC Card, ABS (Item 64, WP 0313 00)

Unit

SPORT/ICE (Item 92, WP 0313 00)

Tools and Special Tools

Tester, Pro-link, diagnostic reader (Item 99, WP

Adapter, test, ABS (item 1 WP 0313 00)

MSD/ICE (Item 58, WP 0313 00)

Multimeter, digital (Item 60, WP 0313 00)

INTRODUCTION

This section contains information on troubleshooting and testing the Anti-lock Brake System (ABS) using blink code

diagnostics and Pro-Link. The ABS is an electronic system that monitors and controls braking only during only during emer-

gency situations. The ABS controls the braking of each wheel separately, which prevents wheel locking, maintains steer abil-

ity, and reduces stopping distance. The ABS has two diagonal circuits. Each circuit connects the front wheel of one side of the

tractor to the rear wheels of the opposite side. In case of a system fault, only half of the ABS stops working. Control of that

half is returned to the standard braking system. The ABS uses a tone ring and sensor on the hub of each monitored wheel. The

sensor sends wheel speed information to the Electronic Control Unit (ECU). The ECU signals the modulator valve for that

wheel to increase, reduce, or maintain pressure in the brake chamber. See Fig 1.