User manual BENDIX EC-60 ABS-ATC STD-PREM CONTROLLERS

[. . . ] Bendix® EC-60TM ABS / ATC Controllers (Standard & Premium Models) Frame and Cab Mount Standard Frame Standard Cab Premium Frame Premium Cab FIGURE 1 - EC-60TM CONTROLLERS TABLE OF CONTENTS PAGE General System Information Introduction . 41 1 INTRODUCTION Bendix® EC-60TM 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. 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 EC-60TM controller is able to optimize slip between the tire and the road surface. [. . . ] If the ECU is in the diagnostic blink code mode and then detects vehicle motion, it will exit the blink code mode. In addition, by operating the blink code switch as described below, one of several diagnostic modes can be entered. See Diagnostic Modes below. Active Diagnostic Trouble Codes When an erroneous system condition is detected, the EC-60TM controller: 1. Illuminates the appropriate indicator lamp(s) and disengages part or all of the ABS and ATC functions. Communicates the appropriate trouble code information over the serial communications diagnostic link as required. Hand-held or PC-based diagnostic tools attach to the vehicle diagnostic connector, typically located on or under the dash (see Figure 9). Blink Code Switch Activation When activating the blink code switch: 1. Wait at least two seconds after "ignition on. " (Except when entering Reconfiguration Mode - see Reconfiguration section on page 10) 2. For the ECU to recognize that the switch is activated "on, " the technician must press for at least 0. 1 seconds, but less than 5 seconds. (If the switch is held for more than 5 seconds, the ECU will register a malfunctioning switch. ) Located on Dash Panel Or Located Under Dash Panel FIGURE 9 - TYPICAL VEHICLE DIAGNOSTIC CONNECTOR LOCATIONS (J1708/J1587, J1939) 3. After a pause of 3. 5 seconds, the ECU will begin responding with output information blinks. See Figure 10 for an example. Blink Code Timing The ECU responds with a sequence of blink codes. The overall blink code response from the ECU is called a "message. " Each message includes, depending on the FIGURE 10 - EXAMPLE OF BLINK CODE MESSAGE 12 mode selected by the technician, a sequence of one or more groups of blinks. Simply record the number of blinks for each sequence and then use the troubleshooting index on page 17 for active or inactive trouble codes and you will be directed to the page that provides troubleshooting information. Sequences of blinks illuminate the ABS indicator lamp for half a second, with half-second pauses between them. Once the ABS indicator lamp begins displaying a sequence of codes, it continues until all blink code messages have been displayed and then returns to the normal operating mode. During this time, the ECU will ignore any additional blink code switch activation. All trouble codes, with the exception of voltage and J1939 trouble codes, will remain in an active state for the remainder of the power cycle. Voltage trouble codes will clear automatically when the voltage returns within the required limits. J1939 trouble codes will clear automatically when communications are re-established. DIAGNOSTIC MODES In order to communicate with the ECU, the controller has several modes that the technician can select, allowing information to be retrieved, or other ECU functions to be accessed. Diagnostic Modes To enter the various diagnostic modes: No. of Times to Press the Blink Code Switch 1 2 3 4 5 7* System Mode Entered Active diagnostic trouble code retrieval Inactive diagnostic trouble code retrieval Clear active diagnostic trouble codes System configuration check Dynamometer Test Mode Reconfigure ECU * To enter the Reconfiguration Mode, the switch must be held in before the application of ignition power. Once the power is supplied, the switch is released and then pressed seven times. CHART 2 - DIAGNOSTIC MODES Active Diagnostic Trouble Code Mode For troubleshooting, typically the Active and Inactive Diagnostic Trouble Retrieval Modes are used. The technician presses the blink code switch once and the ABS indicator lamp flashes a first group of two codes, and if there are more trouble codes recorded, this is followed by a second set of codes, etc. [. . . ] Diagnostic Trouble Code -- A condition that interferes with the generation or transmission of response or control signals in the vehicle's ABS system that could lead to the functionality of the ABS system becoming inoperable in whole or in part. FMVSS-121 -- Federal Motor Vehicle Safety Standard which regulates air brake systems. A control method in which a wheel is controlled at optimum slip, a point where retardation and stability are maximized. The brake pressure that is best for the wheel in question is directed individually into each brake chamber. [. . . ]