1998 OPEL FRONTERA Workshop Manual

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Page 569 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B1–36
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
4WD Control Unit (For Push Button Type)
4WD Control Unit Associated Parts
412RW044
Legend
(1) Lower Cluster Assembly
(2) Front Console Assembly(3)

Page 570 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B1–37 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Removal
1. Remove lower cluster assembly and front console
assembly.
Refer to Interior Trim in Body and Accessories
section.
2. Remov

Page 571 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B1–38
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
MEMO

Page 572 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B2–1 DRIVE LINE CONTROL SYSTEM (TOD)
DRIVELINE/AXLE
DRIVELINE CONTROL SYSTEM (TOD)
CONTENTS
Service Precaution 4B2–1. . . . . . . . . . . . . . . . . . . . . .
General Description 4B2–2. . . .

4B2–1 DRIVE LINE CONTROL SYSTEM (TOD)
DRIVELINE/AXLE
DRIVELINE CONTROL SYSTEM (TOD)
CONTENTS
Service Precaution 4B2–1. . . . . . . . . . . . . . . . . . . . . .
General Description 4B2–2. . . . . . . . . . . . . . . . . . . . .
System Components 4B2–4. . . . . . . . . . . . . . . . . . . .
Parts Location 4B2–4. . . . . . . . . . . . . . . . . . . . . . . .
Functions of Indicator Lamp 4B2–8. . . . . . . . . . . . . .
Diagnosis 4B2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Diagnostic Flow Chart 4B2–16. . . . . . . . . . . . . .
Parts Location 4B2–17. . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Diagram 4B2–18. . . . . . . . . . . . . . . . . . . . . . . . . Connector List 4B2–21. . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Failed Pin 4B2–23. . . . . . . . . . . . . . . . . . . . .
Checking Failed TOD Control Unit Pin 4B2–26. . . . .
Diagnostic Trouble Codes 4B2–30. . . . . . . . . . . . . . . .
Diagnosis from Trouble Codes 4B2–31. . . . . . . . . . . .
Trouble Diagnosis Depending on The Status
of TOD Indicator 4B2–58. . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis from Symptom 4B2–86. . . . . . . . . . . . . . . . .
Service Precaution
WARNING: IF SO EQUIPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

Page 573 of 6000

OPEL FRONTERA 1998 Workshop Manual DRIVE LINE CONTROL SYSTEM (TOD) 4B2–2
General Description
C07RW014–1
TOD (Torque on Demand) system is traction state control
system to vehicle.
Transfer Position and Drive Mode
Three drive modes c

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–2
General Description
C07RW014–1
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
TOD SWModeDrive mode
HIGHON (NORMAL)2HRear wheel drive
OFF (PUSHED)TODElectronically controlled torque split
four wheel drive
4LON/OFF4LLow-speed mechanical lock-up four
wheel drive
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 torque split mechanism
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
unit. The pressing force of the clutch is controlled bychanging 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 split status is controlled
continuously between the rear wheel and four wheel drive
modes. This system includes front and rear speed
sensors, and throttle position sensor that monitors the
engine output.
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
the rear wheels is increased against the current torque
level in the normal rear wheel drive mode, the control unit

Page 574 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B2–3 DRIVE LINE CONTROL SYSTEM (TOD)
detects the slip condition, determines the optimum torque
based on the feedback control logic, and increases the
torque to the front wheels.
The control

Page 575 of 6000

OPEL FRONTERA 1998 Workshop Manual DRIVE LINE CONTROL SYSTEM (TOD) 4B2–4
System Components
Parts Location
A07RW020
Legend
(1) T/F Connector
(2) 4H Switch and 4L Switch
(3) High-Low Planetary Gear Set
(4) Mechanical Lock(5) Multi Plat

Page 576 of 6000

OPEL FRONTERA 1998 Workshop Manual 4B2–5 DRIVE LINE CONTROL SYSTEM (TOD)
Front and Rear Speed Sensors
The sensors are built in the transfer case, detect the
rotation of rotors directly coupled to the propeller shafts.
Thirty

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