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MERITOR WABCO

Section 2 System Components

ECU/VaIve Assembly

· 12 volt

· Integrated ECU and ABS relay valve

· The 2S/1M Basic ECU/VaIve Assembly does not have an external diagnostics connector.

Figure 2.1

ABS External Valve

· Controls air pressure to the brake chambers where it is plumbed.

· During ABS operation, the valve adjusts air pressure to the brake chambers to control braking and prevent wheel lock.

· Used in conjunction with ECU/VaIve Assembly for 2M or 3M systems.

Figure 2.2

Sensor with Molded Socket

· Measures the speed of a tooth wheel rotating with the vehicle wheel.

· Produces an output voltage proportional to wheel speed.

Figure 2.3

Sensor Spring Clip

· Holds the wheel speed sensor in close proximity to the tooth wheel.

Figure 2.4

Sensor Extension Cable

· Two-wire cable with molded-on connector.

· Connects the wheel speed sensor to the ECU.

Figure 2.5

Connection Cable for ABS External Valves

· Three-wire cable with connector.

· Connects the ABS external valve to the ECU.

? "Y" cable for use with 4S/3M configurations also available.

Figure 2.6

Power Cables

· Connects power to the ECU and provides a connection for the warning lamp.

· Available with blunt-end four- or five-wire cable or four- or five-wire industry standard harness connector at one end.

? Molded connector on opposite end used to attach cable to ECU.

Figure 2.7

Diagnostic Cable

? Provides for blink code diagnostics and diagnostics using the MPSI Pro-Link® 9000 diagnostic tool.

? Five-wire cable with over-molded connector to ECU on one end and SAE J1587 diagnostic connector over-molded on the other end.

Figure 2.8

Diagnostic Tool

· Sealed switch and lamp that connects to the SAE J1587 diagnostic connector.

· Used to activate blink code diagnostics, reconfigure the ECU and test the ECU installation.

· Protective dust cap included.

· Designed to remain on the trailer at all times.

Figure 2.9

TABLE OF CONTENTS

Diagnostic Cable Mounting Bracket

· Bracket used to mount the diagnostic cable assembly to the trailer.

Figure 2.10

ECU/Valve Assembly Mounting Bracket

Bracket used to remote mount the ECU/Valve Assembly to the trailer frame.

Figure 2.11

Diagnostic Cable Assembly with Protective Cap

· Diagnostic cable mounted to the bracket with a protective cap on the SAE J1587 diagnostic connector.

Figure 2.12

Diagnostic Cable Assembly with Diagnostic Tool

	Diagnostic cable mounted to the bracket with a diagnostic tool connected to the SAE J1587 diagnostic connector.
	Protective dust cap included.

Figure 2.13

Tooth Wheel

A machined ring mounted to the machined surface on the hub of each ABS-monitored wheel.

Figure 2.14

TABLE OF CONTENTS

Installation Hardware Kit

Contains Schedule 80 NPT pipe nipple fittings and Grade 8, 3/8-inch SAE bolts for proper mounting of ABS components to the trailer frame or reinforced air tanks.

Figure 2.15

Easy-Stop™ Trailer ABS Warning Label

Provides information about the operation of the ABS warning lamp and illustrates blink code fault locations.

Label is self-adhesive and is mounted on the trailer near the ABS warning lamp.

If there is no warning label on your trailer, let your supervisor know. Labels are available from Meritor WABCO. Ask for Part Number TP-95172.

MPSI Pro-Link® 9000 Diagnostic Tool

· Provides diagnostic and testing capability for ABS components.

Requires a cartridge (version 4.0 or higher) designed for use with Meritor WABCO ABS.

NOTE

The Pro-Link® 9000 diagnostic tool is not available from Meritor WABCO. Contact Kent-Moore at 800-328-6657 to order.

Figure 2.16

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