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3- 2 [M21B1]
AUTOMATIC TRANSMISSION AND DIFFERENTIAL
B: FUNCTION
1 . INPUT SIGNAL
Signal name
Major function
Throttle sensor
Detects throttle opening and determines shift point, line pressure and lock-up vehicle
speed according to engine load .
Vehicle speed sensor 1
Detects vehicle speed . This signal is used to control shifting, lock-up, line pressure, and
(mounted to transmission)
transfer clutch .
Vehicle speed sensor 2
Used to control transfer clutch and as backup in case of failure of vehicle speed sensor 1 .
(mounted to transmission)
Engine revolution
Detects engine speed . This signal is used for lock-up clutch smooth, control at lock-up and
" "
" " and
1 range .
to prevent engine overrunning at 2
Inhibitor switch
Used to determine shifting and line pressure for respective ranges "P", "R", "N", "D", "3",
"2' and "1".
Cruise switch (cruise control)
Detects operation of cruise control, and expands "4th" operating range .
ATF temperature sensor
Detects ATF temperature . This signal is used for inhibition of lock-up, release of OD and
detection of ATF temperature.
Manual switch
Used to maintain the transmission in select range 2nd, 3rd when going up or down steep
hills, running on sand, mud, or slippery surfaces .
Used to change the mode from AWD to FWD. Also used to adapt the vehicle to FWD
FWD switch
tester roller. Changeover from AWD to FWD can be accomplished by inserting a fuse into
the fuse holder .
When ABS is operating, to optimize ABS control, transfer clutch torque is controlled to
ABS signal
eliminate the influence of engine braking and reduce the degree of coupling between front
and rear wheels .
Atmospheric pressure sensor
Detects atmospheric pressure. This signal is used for decrease the shift shock at the high
ground .
2. OUTPUT SIGNAL
Signal name
Function
Controls shift stage by turning solenoid ON/OFF . Relationship between solenoid operation
Shift solenoids 1, 2
and shifting stage is shown in Table below . When shifting, timing is controlled for each
solenoid to reduce shock.
Shift solenoid 3
Controls 3-2 shift timing and overrunning clutch operation. Shift timing is controlled by
(Overrunning clutch)
controlling release speed of oil pressure to reduce shock while downshifting . The overrun-
ning clutch is controlled so that it will operate during coasting to apply engine brake .
Duty solenoid A
(line pressure)
Regulates the line pressure according to driving conditions .
Duty solenoid B
Regulates the hydraulic pressure of the lock-up clutch and operates in three modes (open,
(lock-up)
smooth and lock-up) .
Duty solenoid C
Regulates the hydraulic pressure of the transfer clutch and controls the driving force to the
(transfer pressure)
rear drive shaft .
"Power" indicator light
Indicates whether the shift pattern is "Normal" or "Power". The indicator lights in power
"
"
self-diagnosis
mode. This light is also used for
.
FWD pilot light
Lights when the "FWD switch" turned ON .
ATF temperature warning light
Lights when ATF becomes hot (exceeds a set temperature level) .
Engine torque control signal
Reduces engine torque at racing select and gear change .
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Troubleshooting
