traction control Ram 1500 2009 User Guide

Traction Control System (TCS)
The TCS 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 functions similarly 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 ESP are in the
“Partial Off” mode. Refer to “Electronic Stability Pro-
gram (ESP)” in this section of this manual. This brake
pressure modulation transfers drive torque from slipping
to non-slipping wheels to provide optimal forward
traction.
Brake Assist System (BAS)
The BAS is designed to optimize the vehicle’s braking
capability during emergency braking maneuvers. The
BAS detects an emergency braking situation by sensing
the rate and amount of brake application and then
applies optimum pressure to the brakes. The system
applies optimum pressure to the brakes in emergency
braking conditions. This can help reduce braking dis-
tances. The BAS complements the ABS. Applying the
brakes very quickly results in the best BAS assistance. To
receive the benefit of BAS, you must apply continuous
braking pressure during the stopping sequence. Do not
reduce brake pedal pressure unless braking is no longer
desired.
Once the brake pedal is released, the BAS is deactivated.
5
STARTING AND OPERATING 351

WARNING!
•The BAS cannot prevent the natural laws of phys-
ics from acting on the vehicle, nor can it increase
braking efficiency beyond that afforded by the
condition of the vehicle brakes and tires or the
traction afforded.
•The BAS cannot prevent accidents, including
those resulting from excessive speed in turns,
following another vehicle too closely, or hydro-
planing. Only a safe, attentive, and skillful driver
can prevent accidents.
•The capabilities of a BAS-equipped vehicle must
never be exploited in a reckless or dangerous
manner which could jeopardize the user ’s safety
or the safety of others.
Hill Start Assist (HSA)
The HSA system is designed to assist the driver in
launching a vehicle on an incline. HSA will maintain the
level of brake pressure the driver inputs for a short
duration once the driver takes his foot off of the brake
pedal. If the driver does not apply the throttle during this
short duration, the system will release brake pressure
and the vehicle will roll down the incline. The system will
release brake pressure in proportion to the amount of
throttle applied.
During operation, HSA will activate the brake control
system and a clicking noise may occur. If your foot is on
the brake pedal during operation you may feel a slight
pedal movement. The clicking and pedal movement is
normal and both will stop when HSA becomes inactive.
352 STARTING AND OPERATING

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DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES
The following tire grading categories were established by
the National Highway Traffic Safety Administration. The
specific grade rating assigned by the tire’s manufacturer
in each category is shown on the sidewall of the tires on
your vehicle.
All passenger car tires must conform to Federal safety
requirements in addition to these grades.
Treadwear
The Treadwear grade is a comparative rating, based on
the wear rate of the tire when tested under controlled
conditions on a specified government test course. For
example, a tire graded 150 would wear one and one-half
times as well on the government course as a tire graded
100. The relative performance of tires depends upon the
actual conditions of their use, however, and may depart
significantly from the norm due to variations in driving
habits, service practices, and differences in road charac-
teristics and climate.
Traction Grades
The Traction grades, from highest to lowest, are AA, A, B,
and C. These grades represent the tire’s ability to stop on
wet pavement, as measured under controlled conditions
on specified government test surfaces of asphalt and
concrete. A tire marked C may have poor traction perfor-
mance.
9
IF YOU NEED CONSUMER ASSISTANCE 519

WARNING!
The traction grade assigned to this tire is based on
straight-ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or
peak traction characteristics.
Temperature Grades
The temperature grades are A (the highest), B, and C,
representing the tire’s resistance to the generation of heat
and its ability to dissipate heat, when tested under
controlled conditions on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire failure. The
grade C corresponds to a level of performance, which all
passenger car tires must meet under the Federal MotorVehicle Safety Standard No. 109. Grades B and A repre-
sent higher levels of performance on the laboratory test
wheel, than the minimum required by law.
WARNING!
The temperature grade for this tire is established for
a tire that is properly inflated and not overloaded.
Excessive speed, under-inflation, or excessive load-
ing, either separately or in combination, can cause
heat buildup and possible tire failure.
520 IF YOU NEED CONSUMER ASSISTANCE

Inspection........................... 462
Points to Remember .................... 462
Pressure Cap ......................... 461
Radiator Cap ......................... 461
Selection of Coolant (Antifreeze) ......459,488,489
Cruise Control (Speed Control) .............. 160
Cupholders ............................ 189
Customer Assistance ..................... 513
Data Recorder, Event ...................... 67
Daytime Running Lights ................... 151
Dealer Service .......................... 447
Defroster, Rear Window ................... 199
Defroster, Windshield ................84,295,301
Delay (Intermittent) Wipers ................. 154
Differential, Limited-Slip .................. 339
Dipsticks Automatic Transmission ................. 467
Power Steering ........................ 345 Disposal
Antifreeze (Engine Coolant) ............... 462
Door Locks ............................. 29
Door Opener, Garage ..................... 174
Driving Through Flowing, Rising, or Shallow
Standing Water ........................ 341
Driving to Achieve Maximum Fuel Economy .... 251
DVD Player (Video Entertainment System™) .... 290
E-85 Fuel ............................. 390
Electric Rear Window Defrost ............... 199
Electrical Power Outlets ................... 183
Electronic Brake Control System ............. 350
Anti-Lock Brake System ................. 350
Brake Assist System .................... 351
Electronic Stability Program ............... 356
Traction Control System ................. 351
Electronic Range Select (ERS) ............... 320
10
INDEX 525

Oil Pressure.......................... 237
Passing ............................. 153
Seat Belt Reminder ..................... 242
Security Alarm (Theft Alarm) .............. 230
Service ............................. 481
Theft Alarm (Security Alarm) .............. 230
Tire Pressure Monitoring (TPMS) ........... 237
Traction Control ....................... 357
Turn Signal ................... 85,152,481,484
Warning (Instrument Cluster Description) . . 223,227
Limited-Slip Differential ................339,465
Loading Vehicle ......................... 396
Tires ............................... 367
Locks ................................. 29
Child Protection ........................ 33
Door ................................ 29
Power Door ........................... 30
Lower Anchors and Tether for CHildren
(LATCH) .............................. 72 Lubrication, Body
....................... 453
Lug Nuts ............................. 431
Maintenance ........................... 447
Maintenance Free Battery .................. 451
Maintenance Procedures ................... 447
Maintenance Schedule .................... 492
Malfunction Indicator Light (Check Engine) ..... 445
Manual, Service ......................... 517
Manual Transmission Fluid Level Check ..................... 466
Lubricant Selection ..................... 490
Memory Seat ........................... 141
Mini-Trip Computer ...................... 252
Mirrors ................................ 93
Automatic Dimming ..................... 94
Electric Powered ....................... 96
Heated .............................. 97
Memory ............................ 141
10
INDEX 531

Tires ............................84,371,519
Aging (Life of Tires) .................... 376
Air Pressure .......................... 371
Chains .............................. 378
General Information .................... 371
High Speed .......................... 374
Inflation Pressures ..................... 372
Life of Tires .......................... 376
Load Capacity ........................ 367
Pressure Monitor System (TPMS) ........... 381
Pressure Warning Light .................. 237
Quality Grading ....................... 519
Radial .............................. 374
Replacement ......................... 376
Rotation ............................ 379
Safety ........................... 362,371
Sizes ............................... 364
Snow Tires ........................... 379
Spinning ............................ 374 Tread Wear Indicators
................... 375
Wheel Nut Torque ..................... 431
Tongue Weight/Trailer Weight .............. 404
Torque Converter Clutch ................319,325
Tow Hooks, Emergency ................... 437
Towing ............................... 399
24-Hour Towing Assistance ............... 114
Disabled Vehicle ....................... 437
Guide .............................. 404
Recreational .......................... 412
Weight .............................. 404
Towing Assistance ....................... 114
Traction .............................. 340
Traction Control ...................... 230,351
Trailer Sway Control (TSC) ................. 361
Trailer Towing .......................... 399
Cooling System Tips .................... 411
Hitches ............................. 403
Minimum Requirements ................. 405
10
INDEX 537