Permanent Program Functions

Permanent program functions




In addition to the manually-selectable gear-change programs (ECON, SPORT, WINTER), the control module incorporates a number of pre-programmed functions which ensure that the correct gear is selected at all times based on the prevailing driving conditions. These functions vary by market and engine variant.
- A When driving at high altitude, engine power is reduced because there is less oxygen in the air. The control module provides High Altitude Compensation by adjusting gear engagement times to suit the prevailing conditions, thereby maintaining high shifting quality.
- B When the gear shift selector is in position D and the mode selector is set to ECON/SPORT, and the control module simultaneously senses the throttle position and any increase or decrease in the road speed. The relationship between the throttle opening and speed change is a measure of road gradient. The control module uses this information to select a gear. This function is known as "Up Slope Mode".
- C If the transmission temperature increases abnormally as a result of heavy load under high ambient temperature conditions, the torque converter lock- up function is activated as often as possible (temperature controlled lock-up). This reduces slippage and the generation of heat in the transmission. If the temperature drops below +20°C the lock-up function will not be engaged. (This temperature can vary slightly depending on transmission type.) At low temperatures the transmission control module (TCM) increases the transmission line pressure, shortening gear engagement times.
- D/E The transmission control module (TCM) is also programmed with safety functions preventing the manual engagement of low gears if the speed is too high. Nor can reverse gear be engaged if the speed exceeds approximately 5 km/h, even if the gear selector is moved to position R.
- F In the event of a malfunction in the electronic system the warning light in the combined instrument flashes (does not apply to all faults), and the control module switches to a special emergency program. The control system implements corrective action to protect the transmission, while leaving the car in a drivable condition. This makes it possible to drive the car to a workshop for repairs.