1
Introduction
4
WABCO
Maintenance Manual MM-0112 (Revised 07-18)
Figure 1.10
Electronic Stability Control (ESC) Module
The ESC module is part of the ESC system. It measures the vehicle
yaw rate as well as vehicle lateral acceleration. The ESC module
includes part of the ESC control algorithm. It exchanges data with
the ECU via the ESC system internal data link. The ECU supplies the
module with voltage and ground. The ESC module must be
initialized by diagnostic tools whenever the ECU or the ESC module
is replaced. Refer to Section 8. Figure 1.11.
Figure 1.11
Trailer Modulator Valve
In some stability control applications, an additional modulator valve
(the same as what is used for ABS modulation) will be located in the
trailer control line downstream of the 3/2 solenoid valve used to
control the trailer.
Off-Road ABS Switch
On some vehicles, an off-road ABS switch can be included. The
off-road ABS function improves vehicle control and helps reduce
stopping distances in off-road conditions or on poor traction
surfaces such as loose gravel, sand and dirt.
ATC Switch
A vehicle manufacturer might offer an ATC switch to control the ATC
function. Depending on the vehicle ECU configuration for the switch,
there are two function options.
앫
Deep snow and mud option
앫
ATC momentary override option
Refer to Section 2 for more information regarding these features.
Blink Code Switch
A vehicle manufacturer might offer a Blink Code switch to obtain
simple troubleshooting information. Refer to Section 3 for more
information about Blink Codes.
System Configuration
The system configuration is defined by the number of wheel end
sensors and modulator valves. There are three common system
configurations used with E version ECUs. Refer to Section 5 for more
system configurations.
앫
4S/4M (4 wheel speed sensors, 4 modulator valves)
앫
6
S/4M (
6
wheel speed sensors, 4 modulator valves)
앫
6
S/
6
M (
6
wheel speed sensors,
6
modulator valves)
Each system configuration can have features such as ATC, HSA,
RSC or ESC. See Figure 1.12 and Figure 1.13 for an example.
Figure 1.10
Figure 1.11
4006873
a
4010604
a
WARNING
DO NOT MO
VE OR RELOCA
TE
