MCi Reliability Driven Series Operator's Manual page 32

TAG AXLE UNLOAD, ELECTRICAL
(OPTIONAL)
The electrical tag axle unloading feature allows the
operator to partially unload the tag axle using a dash-
mounted switch. When the coach cannot get traction,
this transfers weight to the drive axle. The operator
should refill the tag as soon as the coach has regained
traction. It is unsafe to drive the coach with the tag axle
air springs unloaded.
Only the tag axle unloading feature in low
traction situations.
Do not use it for normal driving. Reduce
coach speed when the tag axle air springs are
unloaded.
To unload, press the TAG AXLE switch located on
the LH switch panel. The TAG UNLOAD telltale will
light and a buzzer will sound.
To re-load, press the TAG AXLE switch again or
drive above 17 mph.
Applying the service brake prevents MDSS from
self-leveling the coach when the tag axle is
unloaded.
IN-STATION LIGHTING/BATTERY CHARGER
(J4500) (OPTIONAL)
An optional 110V AC receptacle in the battery
compartment provides for in-station lighting and
battery charging.
AUTOMATIC TRACTION CONTROL (ATC)
This system improves traction when the coach is
on slippery surfaces by reducing drive wheel spin. If
one drive wheel starts to spin, ATC applies the brake to
transfer engine torque to the wheel with better traction.
If all drive wheels spin, ATC reduces engine torque to
improve traction.
The telltale comes on when the drive wheels spin
during acceleration. It goes out when the drive wheels
stop spinning. ATC is always active; the operator does
not have to select it.
The MUD/SNOW switch is included with ATC. On
extra soft surfaces, such as mud, deep snow or gravel,
this feature increases traction by slightly increasing
wheel spin. When MUD/SNOW is active, the LOW
TRACTION telltale blinks continuously.
30
ELECTRONIC STABILITY CONTROL
Coaches are equipped with a stability control
system that features Electronic Stability Control (ESC)
combined with Roll Stability Control (RSC). ESC is a
computerized technology that improves the safety of a
vehicle's handling by detecting and potentially
preventing skids by automatically applying brakes to
help steer the vehicle where the driver wants to go.
ESC is automatic in that these systems become
active when the system Electronic Control Unit (ECU)
senses conditions that could produce imminent roll or
directional instabilities. Rapid lane changes or
cornering at excessive speed on dry or slippery
surfaces can create the potential for spin-out or drift
out, often before the operator is aware. The ESC
system uses a lateral accelerometer, a steer angle
sensor in the steering column and a yaw rate sensor to
enhance the operator's control in these conditions.
The stability control system is designed to
assist the operator, not to replace the
operator.
The operator will notice a difference in the
coach when the ESC system becomes active,
but should continue to drive as normal and
provide any additional needed corrections. In
an ESC event, the operator may first sense a
decrease in engine power as the system ECU
overrides the accelerator pedal, and may then
sense additional deceleration from an engine
brake application and service brake
applications on the steer axle brakes or all
axle brakes, depending on whether the
conditions suggest the possibility of a
directional control or a rollover event.
July 2015