Opel Frontera UE. Manual - part 1317

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–8

TOD ECU

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

826R100027

Legend

(1) Brake Pedal Bracket

SECTION

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.

SECTION

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–10

Motor Position and Encoder Position Code

High-Low Shift Motor Position

High-Low shift Motor Encoder Signal

State of

Motor

Position a

Position b

Position c

Position d

Motor

High End

A

OFF

OFF

OFF

ON

High Position

Near High End

B

OFF

ON

OFF

ON

High Position

C

ON

ON

OFF

ON

Middle Zone (1)

D

ON

ON

ON

ON

Middle Zone (2)

E

OFF

ON

ON

ON

Neutral Position

F

OFF

ON

ON

OFF

Middle Zone (3)

G

ON

ON

ON

OFF

Low Position

H

ON

OFF

ON

OFF

Low Position

Low End

I

ON

OFF

ON

ON

Encode Position Plate

F04R100005

Legend
(1)

OFF Aria

(2)

ON Aria

(3)

Low

(4)

High

(5)

Earth

Shift High Range and Low Range

When the car is stops (less than 2km/h or 1.2 mph and
less than 1500 rpm), the AT selector position is neutral,
the brake is applied, and the TOD switch is changed to 4L
from TOD (or to TOD from 4L), the high-low shift motor
starts by power applied from the TOD control unit and
turns the shift shaft through the worm gear.
The shift shaft turns the shift cam through the torsional
spring.
The end of the shift cam moves the lockup shift fork and
the spiral groove on the outside of the shift cam slides the
high–low shift fork.

SECTION

4B2–11

DRIVE LINE CONTROL SYSTEM (TOD)

Functions of TOD Switch and
Indicator Lamp

TOD Switch and Indication of Drive Mode

The TOD switch sends signals to the TOD control unit
which selects drive modes and controls the shift on the fly
system (axle disconnect : ADC).

TOD

switch

state

Drive mode

Transfer shift condition

Transfer

position

detection

Shift on the fly

TOD indicator

state

4HSW

4LSW

Axle

SW

ADC circuit

2H

Rear-wheel
drive (RWD)

Permissible during
driving (less than
100 km/h or 62 mph)

OFF

OFF

OFF

Turning on

electricity

TOD

Electronic
torque split
4WD (TOD)

OFF

OFF

ON

Turning off

electricity

( O )

AT: Neutral
Brake: Applied
The car stops (less

4L

Low range
mechanical
direct 4WD
(4L)

The car stops (less
than 2 km/h or
1.2 mph and less than
1500 rpm)

OFF

ON

ON

Turning off

electricity

ADC: Shift on the fly

SW: Switch

TOD

Switch

TOD control unit terminal No.

TOD indicator

state

Switch

state

TOD indicator

TOD switch

state

state

7(Front)

8(Rear)

19(Auto)

30(2H)

43(4L)

2H

OFF

ON

OFF

ON

OFF

TOD

ON

ON

ON

OFF

OFF

4L

ON

ON

OFF

OFF

ON

SECTION