Driveline Control System (Tod); General Description - Isuzu 2000 Trooper Workshop Manual

4B2–2 DRIVE LINE CONTROL SYSTEM (TOD)

General Description

TOD (Torque on Demand) system is traction state control
system to vehicle.
Transfer Position and Drive Mode
Three drive modes can be selected through operation of
4WD switch and transfer lever.
Transfer Position
HIGH
4L
The electronic control unit (ECU) judges the signals from
the transfer lever and controls the transfer drive mode
and shift-on-the-fly system status.
TOD Control
The TOD position usually drives the rear wheels, and
transmits the torque to the front wheels with the help of
electronically controlled
according to running conditions encountered. The driving
force is directly transmitted to the rear wheels. This force
is split by the transfer and delivered to the front wheels.
The magnitude of the torque transmitted to the front
wheels is controlled by changing the pressing force of the
electromagnetic multi plate disk clutch built in the transfer
4WD AUTO
SWITCH
ON
OFF
ON/OFF
torque split mechanism
Mode
2H Rear wheel drive
TOD Electronically controlled torque split
four wheel drive
4L Low-speed mechanical lock-up four
wheel drive
unit. The pressing force of the clutch is controlled by
changing the voltage to the electromagnetic coil mounted
to the rear of the clutch. When the clutch is completely
disengaged, the rear wheels are driven. When the clutch
is completely engaged, a rigid four wheel drive mode is
obtained. The torque
continuously between the rear wheel and four wheel drive
modes. This system includes front and rear speed
sensors, and receives throttle position sensor information
from the PCM.
The control unit receives signals sent from these sensors
and changes the pressing force of the electromagnetic
multi plate disk clutch to determine the torque distribution
on the front and rear wheels. Therefore, when the slip of
C07RY00003
Drive mode
split status is controlled