Iabs Trailer Abs Parts; What Is Wabco’s Iabs Trailer Abs?; System Confi Guration - WABCO iABS 2S/1M Standard Maintenance Manual

Introduction

3.2 iABS Trailer ABS Parts

Parts book PB-8857AS lists WABCO iABS replacement parts. To obtain a copy, go to wabco-auto.com.
For warranty information refer to SP-1375 which can be found at www.wabco-auto.com. For further
information, contact the WABCO Customer Care Center at 855-228-3203.
3.3 What Is WABCO's iABS Trailer ABS?
WABCO's iABS Trailer ABS is an electronic, self-monitoring system that works with standard air brakes. In
addition, iABS includes Power Line Carrier (PLC) capability and CAN capability. PLC information is included
in the ABS Q & A Section of this manual. The major components of the system are the Electronic Control
Unit (ECU)/Valve Assembly, External ABS Modulator Valve (for 3M systems), tooth wheel and wheel
speed sensor. Figure 3.2.
Fig. 3.2
MODULATOR VALVE
CONFIGURATIONS)
3.4 System Confi guration
The ABS confi guration defi nes the number of wheel speed sensors and ABS modulator valves used in a
system. For example, a 2S/1M confi guration includes two wheel sensors and one ABS modulator valve.
A 2S/2M confi guration includes two wheel sensors and two ABS modulator valves. A 4S/2M confi guration
includes four wheel sensors and two ABS modulator valves.
There is a specifi c ECU/valve assembly for each confi guration:
 For 2S/1M Standard, the assembly consists of an ECU and a single modulator valve assembly
 For 2S/2M Standard and 4S/2M, the assembly consists of an ECU and a dual modulator valve
assembly (one valve that combines the function of two modulator valves).
 A 4S/3M premium confi guration consists of an ECU/dual modulator valve assembly and one external
ABS modulator valve.
10
ECU/VALVE
EXTERNAL ABS
ASSEMBLY
(FOR 3M
TOOTH
WHEEL
WHEEL SPEED
SENSOR
4015787a