SD-13-4863 Bendix ABS / ATC Controllers …

1 1 Standard FramePremium FramePremium CabStandard Cab SD-13-4863 Bendix EC-60 ABS / ATC Controllers (Standard & premium Models)FIGURE 1 - EC-60 CONTROLLERSF rame and Cab MountINTRODUCTIONB endix EC-60 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.

2 By monitoring individual wheel turning motion during braking, and adjusting or pulsing the brake pressure at each wheel, the EC-60 controller is able to optimize slip between the tire and the road surface. When excessive wheel slip, or wheel lock-up, is detected, the EC-60 controller will activate the Pressure Modulator Valves to simulate a driver pumping the brakes. However, the EC-60 controller is able to pump the brakes on individual wheels (or pairs of wheels), independently, and with greater speed and accuracy than a addition to the ABS function, premium models of the EC-60 controller provide an Automatic Traction Control (ATC) feature.

3 Bendix ATC can improve vehicle traction during acceleration, and 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 EC-60 Controllers have a drag torque control feature which reduces driven-axle wheel slip (due to driveline inertia) by communicating with the engine s controller and increasing the engine OF CONTENTS PAGEG eneral System InformationIntroduction.

4 1 Components .. 2 ECU Mounting .. 2EC-60 controller Hardware Confi gurations .. 2EC-60 Controllers with PLC .. 3EC-60 controller Inputs .. 3 ABS Off-Road Switch and Indicator Lamp .. 4EC-60 controller Outputs .. 4 Power-Up Sequence .. 5 ABS Operation .. 6 ATC Operation .. 7 Dynamometer Test Mode .. 8 Automatic Tire Size Calibration .. 8 ABS Partial Shutdown .. 9 System Reconfi gurationEC-60 controller System Reconfi guration .. 10 TroubleshootingGeneral.. 11 Diagnostic Trouble Codes.

5 12 Using Hand-Held or PC-based Diagnostics .. 13 Diagnostic Trouble Codes: Troubleshooting Index .. 16 Trouble Code Tests .. 18 - 27 Connector and Harnesses .. 28 - 31 Wiring .. 32 - 34 Wiring Schematics .. 28 - 31 Glossary .. 412 Delivery (Port 2) Supply (Port 1) Exhaust (Port 3) Electrical ConnectorM-32QR ModulatorM-32 ModulatorCOMPONENTSThe EC-60 controller s ABS function utilizes the following components: Bendix WS-24 wheel speed sensors (4 or 6, depending on ECU model and confi guration).

6 Each sensor is installed with a Bendix Sensor Clamping Sleeve Bendix M-32 or M-32QR Pressure Modulator Valves (4, 5, or 6 depending on ECU model and confi guration) Dash-mounted tractor ABS Indicator Lamp Service brake relay valve Dash-mounted trailer ABS Indicator Lamp (used on all towing vehicles manufactured after March 1, 2001) Optional blink code activation switch Optional ABS off-road switch. (Off-road feature is not available on all models - See Chart 1.)The EC-60 controller ATC function utilizes the following additional components.

7 Traction control valve (may be integral to the service brake relay valve or a stand-alone device) Dash-mounted ATC status/indicator lamp J1939 serial communication to engine control module Stop lamp switch input (may be provided using the ECU hardware input or J1939) Optional ATC off-road switchFIGURE 4 - POWER LINE WITHOUT PLC SIGNALFIGURE 2 - Bendix WS-24 WHEEL SPEED SENSORSFIGURE 3 - M-32 AND M-32QR MODULATORSFIGURE 5 - POWER LINE WITH PLC SIGNALECU MOUNTINGCab ECUsCab-mounted EC-60 Controllers are not protected against moisture, and must be mounted in an environmentally protected wire harness connectors must be properly seated.

8 The use of secondary locks is strongly : All unused ECU connectors must be covered and receive any necessary protection from moisture, ECUs utilize connectors from the AMP MCP product ECUsFrame-mounted EC-60 Controllers may be mounted on the vehicle frame, but only in locations where they will not be subjected to direct tire spray. ECU mounting bolts must be torqued to to 9 : The frame wire harness connectors must be properly seated with the seals intact (undamaged). All unused connector terminals must be plugged with the appropriate sealing plugs.

9 Failure to properly seat or seal the connectors could result in moisture or corrosion damage to the connector terminals. ECUs damaged by moisture and/or corrosion are not covered under the Bendix ECUs utilize Deutsch Speed SensorsStraight Speed SensorsSensor ClampingSleeve3 Alternatively, the part number shown on the ECU label can be identifi ed as a PLC or non-PLC model by calling the Bendix TechTeam at 1-800-AIR-BRAKE (1-800-247-2725).EC-60 controller INPUTSB attery and Ignition Inputs The ECU operates at a nominal supply voltage of 12 or 24 volts, depending on the model of the ECU.

10 The battery input is connected through a 30 amp fuse directly to the ignition input is applied by the ignition switch through a 5 amp InputThe EC-60 controller supports one ground input. See pages 35 to 40 for system Indicator Lamp Ground Input (Cab ECUs Only)EC-60 cab ECUs require a second ground input (X1-12) for the ABS indicator lamp. The X1 wire harness connector contains an ABS indicator lamp interlock (X1-15), which shorts the ABS indicator lamp circuit (X1-18) to ground if the connector is removed from the ECU.