2 Automatic Traction Control (ATC), Deep Snow and Mud Switch and Roll Stability Control (RSC)
10
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
2 Automatic Traction Contro l (ATC), Deep Snow and Mud Switc h and Roll Stability Con trol (RS C)
ATC
Automatic traction control is available as an option on all E version
ABS ECUs and is standard on most. ATC can be used with individual
valves, or with an integrated ABS/ATC valve package. ATC helps
improve traction when vehicles are on slippery surfaces by reducing
drive wheel overspin. ATC works automatically in two different ways.
A. If a drive wheel starts to spin, ATC applies air pressure to brake
the wheel. This transfers engine torque to the wheels with
better traction.
B. If all drive wheels spin, ATC reduces engine torque to provide
improved traction.
If ATC turns itself on and off, drivers do not have to select this
feature. If drive wheels spin during acceleration, the ATC indicator
lamp comes on, indicating ATC is active. It goes out when the drive
wheels stop spinning. Figure 2.1.
NOTE: Some vehicle manufacturers may refer to ATC as Anti-Spin
Regulation (ASR).
Figure 2.1
If ATC is installed, there will be an indicator lamp on the vehicle dash
or instrument panel marked ATC or ASR.
If the ATC lamp goes out before the ABS lamp, there is no ATC.
An ATC installation may use an individually mounted valve, or the
valve may be part of the ABS valve package. Figure 2.2.
Figure 2.2
Figure 2.1
NORMAL
VEHICLE
OPERATION
EXCESSIVE WHEEL
SPIN ATC
OPERATIONAL
(ATC LAMP COMES ON)
1002015a
(ATC LAMP IS OFF)
WHEELS
STOP
SPINNING
(ATC LAMP GOES OUT)
Figure 2.2
VALVE PACKAGE
INSTALLATION (REAR)
AIR LINES
ELECTRICAL LINES
LAMPS (UP TO
THREE: ABS,
TRAILER ABS, ATC)
LAMPS
4S/4M ABS/ATC
ATC VALVE
1002004g
VALVE PACKAGE
INSTALLATION (FRONT)
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