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

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.