Automatic Transmission
ELECTROHYDRAULIC CONTROL SYSTEM
AT-11
D: CONTROL ITEMS
1. MPT MODELS
Control item Description of control
Transmission
control
Gear shift control Base shift control
! Base pattern
! Power pattern
Upshifting and downshifting are set for each range, gear and
pattern according to throttle position and vehicle speed.
ABS-in-operation control Gear is locked in 3rd when ABS signal enters.
ATF-low-temperature con-
trol
Shifting into 4th gear is prevented when ATF temperature is
below the preset value.
Hold control With HOLD switch ON, vehicle starts in 2nd gear (if the D, 3
or 2 range is selected).
Power pattern control
(POWER light ON)
Power pattern is selected when POWER switch is ON.
Base pattern control
(POWER light OFF)
Base pattern is selected when POWER switch is OFF.
Lock-up control Base lock-up control Lock-up ON is set for D-range 4th gear; ON/OFF is set for all
gears (except D-range 4th) and patterns. Lock-up control is
performed according to throttle position and vehicle speed.
(Basically lock-up is OFF during gear shifting.)
Smooth control Smooth lock-up is performed when lock-up is switched on.
Line pressure con-
trol
Ordinary control Line pressure is regulated according to throttle position, vehi-
cle speed and range signals.
Shifting control Line pressure is regulated when shifting to lessen shifting
shock.
Starting control Line pressure is lowered to a minimum so as to reduce en-
gine cranking load.
Shift timing control Shift step control ON/OFF timing for shift solenoid is controlled.
Lock-up control When shifting, the lock-up clutch is temporarily released.
Line pressure control When shifting, line pressure is controlled to the optimum level
so as to reduce shifting shock.
AWD transfer
clutch control
Ordinary transfer control Transfer clutch pressure is regulated according to the throttle
valve angle and vehicle speed.
1 range control Transfer clutch pressure is increased.
Slip control Immediately after detecting a slip, transfer clutch pressure is
controlled to the same pressure as 1 range. (This control is
canceled if V
≥ 60 km/h (37 MPH), or when throttle valve is
closed fully.)
Control in turns Transfer clutch pressure is reduced after detecting a turn.
ABS-in-operation control Transfer clutch pressure is adjusted to a set level immediately
after reception of ABS signal.
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