Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Instruction - page 97

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–6

High-Low Planetary Gear Set

Establishes an auxiliary transmission mechanism. When
the TOD switch is set to the 2H or TOD position, the
reduction gear ratio is 1.000 and the corresponding
driving force is generated. When the TOD switch is set to
the 4L position, the reduction gear ratio is 2.480 and the
corresponding driving force is generated.

262RW030

4H and 4L Switch

Detects the shift position of the transfer from the
movement of the shift rod and outputs signals to the TOD
control unit.

261RW002

Transfer Connector (12-pin type)

Transmits the input and output signals of the speed
sensors, electromagnetic coil, and 4H and 4L switche to
the vehicle harness. A waterproof 12-pin type is used.

261RW046

Transfer Connector (8-pin type)

Transmits the output signals of the shift motor position to
the vehicle harness and power for the shift motor to the
transfer. A waterproof 8-pin type is used.

261RY00039

4B2–7

DRIVE LINE CONTROL SYSTEM (TOD)

TOD Indicator Lamps (on the instrument
panel)

Inform the following items.

D

Bulb check

D

Drive mode

D

ABS IN status

D

BRAKE ON status

821R200016

Check Lamp

Inform the following items.

D

Bulb check

D

Fail (fail alarm)

D

Trouble code

821R200016

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–8

TOD ECU

This control unit is mounted to the clutch pedal position
via a special bracket.

826R200019

Legend

(1) Brake Pedal Bracket

4B2–9

DRIVE LINE CONTROL SYSTEM (TOD)

High-Low Shift Motor

F07R200002

Legend

(1) Reduction Hub
(2) Mechanical Lock Sleeve (Including the built-in

Spring)

(3) Lockup Shift Fork
(4) Return Spring
(5) To TOD Control Unit
(6) Fixed Contact Point
(7) Encoder
(8) Worm gear
(9) Rotate

(10) Shift Motor

(11) The shift cam (12) can be turned freely around

the shift shaft (14).

(12) Shift Cam
(13) Torsional Spring
(14) Shift Shaft
(15) Shift Rod
(16) High-Low Shift Fork
(17) High
(18) Low
(19) 2H and TOD Position
(20) Direct Four Wheel Drive (4L Position)
(21) Earth
(22) High
(23) Low
(24) High
(25) Low

When the TOD switch is changed to the 4L (or TOD)
position from the TOD (or 4L) position, the TOD control
unit drives the high–low shift motor according to the
signal. The transfer is shifted to low range from high range
(or to high range from low range) by the shift motor.
The high-low shift motor can run, only when the operation
meets the following conditions to prevent an unexpected
shift between high and low range by a operation error.

1. The car stops. (less than 2 km/h or 1.2 mph and less

than 1500 rpm.)

2. The AT selector position is neutral.
3. The brake is applied. (brake switch is on.)

The shift motor has a built-in encoder which watches
motor rotation position. The control unit controls the
rotation of the shift motor based on the position code
detected by the encoder.
The encoder position plate turns together with the shift
shaft and switches on or off the current from the 4 (four)
fixed contact points on the case, then the control unit
recognizes the rotation position of the shift motor.

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