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Traction Control System (TCS)
This system monitors the amount of wheel spin of each of
the driven wheels. If wheel spin is detected, brake pressure
is applied to the slipping wheel(s) and engine power is
reduced to provide enhanced acceleration and stability. A
feature of the TCS system, Brake Limited Differential (BLD),
functions similar to a limited slip differential and controls
the wheel spin across a driven axle. If one wheel on a driven
axle is spinning faster than the other, the system will apply
the brake of the spinning wheel. This will allow more
engine torque to be applied to the wheel that is not
spinning. This feature remains active even if TCS and ESC
are in the Partial Off mode. Refer to “Electronic Stability
Control (ESC)” in this section for further information.
Hill Start Assist (HSA)
The HSA system is designed to assist the driver when
starting a vehicle from a stop on a hill. HSA will maintain
the level of brake pressure the driver applied for a short
period of time after the driver takes his foot off the brake
pedal. If the driver does not apply the throttle during this
short period of time, the system will release brake
pressure and the vehicle will roll down the hill. The
system will release brake pressure in proportion to the
amount of throttle applied as the vehicle starts to move in
the intended direction of travel.
HSA Activation Criteria
The following criteria must be met in order for HSA to
activate:
• Vehicle must be stopped.
• Vehicle must be on a 2.5% (manual transmission) or 7%
grade or greater (automatic transmission) hill.
• Gear selection matches vehicle uphill direction (i.e.,
vehicle in NEUTRAL (manual transmission), vehicle
facing uphill is in forward gear; vehicle backing uphill
is in REVERSE gear).
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STARTING AND OPERATING 251
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