Isuzu Trooper (1998-2002 year). Service manual — part 119
4B1–1
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
DRIVELINE/AXLE
DRIVELINE CONTROL SYSTEM (SHIFT ON THE FLY)
CONTENTS
Service Precaution
4B1–1
. . . . . . . . . . . . . . . . . . . . . .
Shift on the Fly System (Lever Type)
4B1–2
. . . . . . .
Outline of Shift on the Fly System
(Lever Type)
4B1–2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift on the Fly Vacuum Piping and Electric
Equipment (For Lever Control Type)
4B1–3
. . . . . .
Vacuum Piping Diagram
4B1–3
. . . . . . . . . . . . . . . .
Inspection and Repair
4B1–4
. . . . . . . . . . . . . . . . . .
Shift on the Fly System (Push Button Type)
4B1–7
.
Outline of Shift on the Fly System
(Push Button Type)
4B1–7
. . . . . . . . . . . . . . . . . . . .
Functions of Indicator Lamp
4B1–11
. . . . . . . . . . . . . . .
Diagnosis
4B1–11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle Diagnosis
4B1–30
. . . . . . . . . . . . . . . . . . .
Shift on the Fly Vacuum Piping and Electric
Equipment (For Push Button Type)
4B1–32
. . . . . . . .
Vacuum Piping Diagram
4B1–32
. . . . . . . . . . . . . . . .
Inspection and Repair
4B1–33
. . . . . . . . . . . . . . . . . .
4WD Control Unit (For Push Button Type)
4B1–36
. .
4WD Control Unit Associated Parts
4B1–36
. . . . . .
Removal
4B1–37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
4B1–37
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
4B1–2 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly System (Lever Type)
Outline of Shift on the Fly System
(Lever Type)
The shift on the fly system (Lever type) switches between
2 wheel drive (2WD) and 4 wheel drive (4WD) by driver’s
shifting the transfer control lever on the floor.
This system controls below operations.
1. Connecting front wheels to, and disconnecting them
from, the front axles by vacuum actuator.
2. Indicator on instrument panel.
3. 4WD signal to Electronic Hydraulic Control Unit for
brake system (If anti–lock brake system is equipped).
4B1–3
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly Vacuum Piping and Electric Equipment
(For Lever Control Type)
Vacuum Piping Diagram
C04RW015
VSV Assembly, Actuator Assembly
412RS032
Vacuum Tank
412RS033
4B1–4 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Inspection and Repair
Vacuum Piping
C04RW016
1. Pull out the Hose A in figure and install a vacuum
gauge.
2. Plug up Hose B in figure to prevent the leak of
vacuum.
3. Start the engine and measure vacuum 2 or 3 minutes
afterward.
4. Repeat 1) and 2) but with Hose A plugged and Hose B
pulled out.
5. If vacuum measures –400mmHg, or if it shows a
sudden drop immediately after engine stop, inspect
the hose, tank, and pipe for damage.
NOTE: Be careful not to permit the entry of dust and
water during inspection.
6. Pull out Hose D in above illustration.
7. Plug Hose E in above illustration.
8. Make sure that Hose D in above illustration is under
atmospheric pressure.
9. Pull out Hose E and plug Hose D, and make sure that
Hose E is under atmospheric pressure.
10. If Check 8) or 9) has revealed stoppage, check and
see that there is no bend, foreign matter in the hose or
in the filter. If there is trouble, repair or replace.
Check Valve
C04RS004
1. Apply vacuum from the orange colored side(1).
Vacuum:–400mmHg
2. Check leakage of vacuum.
3. Make sure that vacuum cannot be applied from the
black colored side(2).
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