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AUTOMATIC TRANSMISSION (AW30-40LE) 7A–7 CONTROL AND FUNCTIONS Item Description Shift and lock-up control • In D range, speed change point and Lock-up point can be changed by setting pattern selection switch to "POWER", "NORMAL" or "WINTER" • Gear shift position in the conditions made up of transmission shift positions (D.2.L) combined with pattern selection switch (POWER, NORMAL, and Overdrive cut control • If O/D OFF switch is set on in D range (O/D OFF lamp ON), gear shift to O/ D is not effected. • Overdrive is released at O/D OFF switch on and high transmission oil temperature (More than 130 ° C). However, to prevent engine over revolution • 4 → 3 shifting at vehicle speed is less than 118 km/h. • 3 → 4 shifting at vehicle speed is more than 131 km/h. Lock-up cut control • In D range, 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 judgement, gear • Lock-up is released at brake on or high transmission oil temperature (More than 130 ° C). • Lock-up is prohibited when idling is defected by throttle position sensor. Driving mode select control • The TCM selects a suitable driving mode from the nine kinds for the variety driving condition. i)Economy mode ii)Power mode iii)Winter mode iv)HOT1 mode v)HOT2 • The priority of driving mode: Economy < Power < Slope < L4 < Winter < HOT1 < HOT2 Squat control • When the TCM detects D signal on, the TCM controls 1–3–1 shift by setting a timer, in order to improve the shift feel at N → D. Line pressure control • The TCM output current which corresponds to throttle oil pressure to pressure control solenoid based on throttle opening. Indicate oil temperature warning • If the transmission oil temperature sensor senses that transmission oil temperature is greater than 146 ° C, the TCM turn on A/T OIL TEMP warning lamp. (The warning lamp is turned off, if oil temperature is less ° C.) L4 mode control • The TCM judges whether the transfer is engaged in high or low based on the ratio rpm data from output speed sensor in the transmission and the Up and down hill control • The TCM judges up and down hill, and change shift pattern based on throttle opening and acceleration. Correct oil temperature control • If the temperature exceeds a predetermined value, the TCM selects the high oil temperature shift point for downshifting, thus preventing the oil ° C, D range) |