System Functions

Range Selection
The selector lever is connected to the transmission via a bowden cable, which operates the transmission selector shaft between all positions except Drive to 4.

The Transmission Control Module (TCM) detects the gear selected by means of a rotary position switch fitted to the transmission selector shaft. A separate Drive to 4 switch is located within the 'J gate' assembly.

Movement of the selector lever between Park, Reverse, Neutral and Drive manually directs the flow of transmission oil; the TCM having control of the forward gears selected while the lever is in the Drive position.

Shift Point Selection
The gearshift points are selected, by the TCM, as a function of the output speed, engine load, selector position and shift program selected. The operator has control over the shift points via the selector lever, throttle pedal movement, kickdown function and mode switch.




'J' Gate Layout

Mode Switch
This switch allows the driver to select one of two base shift maps; Normal and Sport modes, the switch being illuminated when Sport is selected.

Special Shift Programs
These specific condition shift maps are available to enhance the operation of the vehicle under specific driving conditions, and are listed below in order of priority/title and operating condition.
1. Traction: When traction intervention is active
2. Hot mode: Extreme engine/transmission temperatures
3. Gradient: Under specific speeds and loads
4. Cruise: During cruise control
5. Manual: Shift map when the LH side of the 'J gate' is used

Three specific condition shift maps have a higher priority than the two base shift maps and will intervene when appropriate conditions prevail for traction, gradient or cruise.

When traction control (engine or brake system derived) is operational the TCM will implement the traction map to maximize control of wheel slip.

The gradient maps are intended to enhance vehicle drivability when towing or climbing a gradient. The TCM will implement the maps when increased driving resistance is detected and enhanced drivability, cooling and increased performance is appropriate.

The cruise map is intended to minimize unwanted gearshifts and 'hunting' and is activated when cruising near to the set speed, or resuming.