Selectable Drive Modes

The selectable drive mode system optimizes driveability and comfort as well as maximizing traction while operating on different types of terrain. 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 and gear changes to enhance powertrain response based on the selected mode.
• AWD module: automatically engages and disengages specific 4WD modes and raises or lowers torque output based on the selected mode.

The following drive modes are available:

• Deep Snow/Sand: 

  For soft dry sand or deep snow.

• Eco: 

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

• Normal: 

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

• Slippery: 

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

• 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. This mode also provides engine braking in all forward gears.

• Trail: 

  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.