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7A-8 AUTOMATIC TRANSMISSION (AW30-40LE) CONTROL AND FUNCTIONS Item Description Pattern selection control ・ In D range, speed change point and Lock-up point can be changed by setting pattern selection switch to “POWER” or Gear shift control ・ Gear shift position in the conditions made up of transmission shift positions (D.2.L) combined with pattern selection switch Lock-up control ・ In D range, 2nd, 3rd, or O/D lock-up is conducted in “POWER” or “NORMAL” mode. ・ In 2, L range, lock-up is off in the whole area. ・ Lock-up timing is controlled to reduce gear shift shock using kind of gear shift (shift up, etc.) lock-up status at the time of gear shift ・ When the brake is switched on, lock-up is discontinued. ・ Lock-up is prohibited when idling is defected by throttle position sensor. Overdrive gear shift control ・ If O/D switch is set on in D range (O/D OFF lamp ON), gear shift to O/D is not effected. However, to prevent engine over revolution. ・ 4→3 shifting at vehicle speed is less than 126 km/h (TF), 124 km/h (UBS). ・ 3→4 shifting at vehicle speed is more than 128 km/h (TF), 126 km/h (UBS). Throttle leaning control ・ Variation in throttle position sensor voltage is corrected in TCM thereby to ensure a constant gear shift control. Fail-safe function ・ When trouble occurs to vehicle sensor and each solenoid, TCM automatically exerts fail-safe control not to spoil driveability. ・ This control is exerted when sensor or actuator is in trouble, while TCM works normally. Self-diagnosis function ・ If there is an abnormality in vehicle sensors, each solenoid (S1- S3), or throttle position sensor, “CHECK TRANS” lamp is ・ Faulty parts are memorized in TCM. If self-diagnosis start signal is inputted, “CHECK TRANS” lamp is blinked and results of Tech 2 ・ Output of control data in the TCM ・ Actuator (Solenoid) operation check ・ Erasure of trouble code |