Selectable Drive Modes

The selectable drive mode system optimizes drivability and comfort as well as maximizing traction while operating on different types of terrain. On all 4x2 vehicles and on 4x4 vehicles with a low-level instrument cluster, the overdrive cancel switch controls the drive mode selection. When the switch is pressed, the TCM receives a signal and then transmits the drive mode message to the ABS module over the HS-CAN2. On 4x4 vehicles with a mid to high-level instrument cluster, the ATCM controls the drive mode selection. When a drive mode is selected, the ATCM sends the drive mode message to the ABS module over the HS-CAN2. When the ABS module receives the message, it alters the intervention thresholds for ESC, RSC and traction control based on the selected mode. The ABS module also sends the drive mode message out to several other modules. The following modules receive the message and respond by altering their operation as follows:

• PSCM: adjusts steering effort and feel based on the selected mode.
• PCM: adjusts throttle response to enhance powertrain response based on the selected mode.
• TCM: adjusts gear changes to enhance powertrain response based on the selected mode.
• TCCM: automatically engages and disengages specific 4WD modes and raises or lowers torque output based on the selected mode.
• DCMR: engages and disengages automatically based on the selected mode.

The following drive modes are available:

• Normal 

  : Used for normal, everyday on-road driving and towing. The Tow-Haul function can only be used in Normal mode.

• Sport 

  : Used for more spirited on-road driving; increases throttle response, provides a sportier steering feel, along with quicker shifting. The transmission also holds gears longer, helping the vehicle accelerate faster when shifting gears.

• Tow-Haul 

  : For improved transmission operation when towing a trailer or a heavy load. Tow Haul moves upshifts to higher engine speeds to reduce the frequency of transmission shifting.

• Eco 

  : For efficient and responsible driving. Eco helps deliver maximum fuel efficiency and increases driving range.

• Snow/Wet (4x2) or Grass/Gravel/Snow (4x4) 

  : For firm surfaces covered with loose or slippery material such as packed snow, ice, water, grass or a thin layer of gravel or sand.

• Sand (4x4) 

  : For soft dry sand or deep gravel.

• Mud/Rut (4x4) 

  : For muddy, rutted, soft or uneven terrain.

Drive mode changes are not available when the ignition is OFF. If a mode is unavailable, the system defaults to Normal mode.