Bendix Commercial Vehicle Systems EC-80 ABS ATC SD User Manual

Ec-80, Abs / atc controllers, Introduction

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1

®

SD-13-4983

Bendix

®

EC-80

ABS / ATC Controllers

FIGURE 1 - BENDIX

®

EC‑80

ABS AND ATC CONTROLLERS

INTRODUCTION

Bendix

®

EC‑80

ABS and ATC controllers are members

of a family of electronic

Antilock Braking System

(ABS) devices designed to help improve the braking

characteristics of air braked vehicles ‑ including heavy‑ and

medium‑duty buses, trucks, and tractors. ABS controllers

are also known as

Electronic Control Units (ECUs).

Bendix

®

ABS uses wheel speed sensors, ABS modulator

valves, and an ECU to control either four or six wheels of

a vehicle. By monitoring individual wheel turning motion

during braking, and adjusting or pulsing the brake pressure

at each wheel, the Bendix

EC‑80 controller is able to

optimize slip between the tire and the road surface. When

excessive wheel slip, or wheel lock‑up is detected, the

Bendix

EC‑80 controller will activate the Pressure Modulator

Valves to simulate a driver pumping the brakes. However,

the Bendix

EC‑80 controller is able to pump the brakes on

individual wheels (or pairs of wheels) independently, and

with greater speed and accuracy than a driver.
In addition to the ABS function, the ATC version of the

Bendix

EC‑80 controller provides an

Automatic Traction

Control (ATC) feature. Bendix

®

ATC can improve vehicle

traction during acceleration, plus lateral stability while

driving through curves. ATC utilizes

Engine Torque

Limiting (ETL) where the ECU communicates with the

engine’s controller and/or

Differential Braking (DB) where

individual wheel brake applications are used to improve

vehicle traction.
Bendix

EC‑80 ATC controllers also have the capability to

provide a

Hill Start Assist (HSA) feature. HSA interfaces

Two Connectors

Are Used

Bendix

®

EC‑80

ATC Controller

Bendix

®

EC‑80

ABS Controller

Three Connectors

Are Used

TABLE OF CONTENTS

PAGE

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1‑2
Component/ECU Mounting. . . . . . . . . . . . . . . . . . . . . . . 2‑3
ABS Off‑Road Switch and Indicator Lamp Operation. . . . .4
Bendix EC‑80 Controller Outputs . . . . . . . . . . . . . . . . . . . .4
Indicator Lamp Behavior. . . . . . . . . . . . . . . . . . . . . . . . . 5‑6
Power‑Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 6‑7
ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
ATC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8‑9
Dynamometer Test Mode . . . . . . . . . . . . . . . . . . . . . . . 9‑10
Automatic Tire Size Calibration . . . . . . . . . . . . . . . . . . . .10
ABS Partial Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . .10
System Reconfiguration . . . . . . . . . . . . . . . . . . . . . . . . .11
Blink Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Diagnostic Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Using hand‑held or PC‑based diagnostics . . . . . . . . . . . .16
Diagnostic Trouble Code Index . . . . . . . . . . . . . . . . . . . .18
Troubleshooting: Wiring . . . . . . . . . . . . . . . . . . . . . . . 32‑37
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Appendix: J1939 SPN and FMI Codes. . . . . . . . . . . . 40‑43

The driver is always responsible for the control

and safe operation of the vehicle at all times. The

Bendix

®

ABS system does not replace the need

for a skilled, alert professional driver, reacting

appropriately and in a timely manner, and using

safe driving practices.

See SD‑13‑21021 for the Bendix

®

eTrac

Automated Air

Suspension Transfer System
Bendix

®

EC‑80

ESP(+) Controllers will be featured in

SD‑13‑4986.

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