Bendix Commercial Vehicle Systems GEN 5 ABS - Manual (Page 5)

5
Component Overview
Bendix ABS components include:
• Electronic Control Unit (ECU): The ECU monitors
and controls the ABS. It also diagnoses ABS
malfunctions and stores specific diagnostic trouble
codes.
• Pressure Modulator Valve (PMV): This
component regulates brake chamber air pressure. It
houses the hold and release solenoids. A modulator
valve is located near each brake chamber or pair of
brake chambers that make up an ABS controlled wheel
site.
• Rear Axle Valve Assembly: An assembly made up of
two pressure modulator valves and a relay valve.
• Wheel End Speed Sensor: Single point variable
reluctance (magnetic) sensor that generates an
alternating voltage signal in response to the movement
of teeth on a tone wheel.
• ABS Lamp (Yellow): This indicator lamp, located on
the driver instrument panel, warns the driver of ABS
malfunctions. It is also capable of blinking diagnostic
fault codes when the ECU is in the self-diagnostic mode.
• In-Cab ABS Trailer Lamp: This indicator lamp, located
on the driver instrument panel, warns the driver of trailer
ABS malfunctions. It is not capable of blinking
diagnostic trouble codes.
• ATC Valve: The traction control valve applies full system
pressure to the relay valve during traction control
operation to provide differential (side to side) braking
at controlled drive axles.
• ATC Lamp: This indicator lamp, located on the driver
instrument panel, lights to indicate loss of traction which
is being managed by the Automatic Traction Control
System.
• Relay/Breaker Panel: The OEM provides two circuit
breakers and either one or two relays as part of the
ABS. One relay is used for indicator lamp control. A
second (optional) relay may be used to control a retarder
and/or lockup torque converter.
• Diagnostic Port Connector: The diagnostic port
connector is an industry standard connector that is used
to connect to the J1587 diagnostic link. This connector
also provides power and ground for diagnostic test
equipment.