Isuzu Trooper (1998-2002 year). Service manual — part 126
4B1–29
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
3. Case that indicator’s blinking changes to 4Hz
after aforementioned Solution 4 is carried out.
Step
Action
Yes
No
1
Can the transfer lever be operated from High to 4L or vice versa?
Faults on the
harness wiring of
motor actuator.
Trace this chart
from the start
after repair or
replace.
Faults on the
motor actuator.
Trace this chart
from the start
after replace.
Internal faults on
transfer case.
Disassemble the
transfer case for
check. Trace this
chart from the
start after repair
or replace.
Faults on the
4WD control unit.
Trace this chart
from the start
after replace.
4B1–30DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Front Axle Diagnosis
D
When the 4WD switch is operated from 4H to 2H,
indicator light does not go out.
Step
Action
Yes
No
1
Drive slow 100 — 200m after a few minutes” idling.
Has indicator light gone out?
All right.
Go to Step 2
2
Jack up front tires.
Does the right side of front wheel rotate when the left side of front
wheel is rotated?
Go to Step 4
Go to Step 3
3
1. Check the actuator switch.
2. Check the circuit to indicator.
Was a problem found?
Trace this chart
from the start
after repair or
replace.
Disassemble axle
ASM for check.
Trace this chart
from the start
after repair or
replace.
4
1. Check the VSV valve.
2. Check the circuit to VSV valve.
Was a problem found?
Trace this chart
from the start
after repair or
replace.
Go to Step 5
5
Is vacuum piping all right? (tank, hose, & pipe damage or trouble)
Go to Step 6
Trace this chart
from the start
after repair or
replace.
6
Does actuator work all right?
Trace this chart
from the start.
Disassemble axle
ASM for check.
Trace this chart
from the start
after repair or
replace.
4B1–31
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
D
When the 4WD switch is operated from 2H to 4H,
indicator light is not actuated.
Step
Action
Yes
No
1
Drive slow 100 — 200m after a few minutes” idling.
Has indicator light actuated?
All right.
Go to Step 2
2
Jack up front tires.
Does not the right side of front wheel rotate when the left side of
front wheel is rotated?
Go to Step 4
Go to Step 3
3
1. Check the actuator switch.
2. Check the circuit to indicator.
Was a problem found?
Trace this chart
from the start
after repair or
replace.
Disassemble axle
ASM for check.
Trace this chart
from the start
after repair or
replace.
4
1. Check the VSV valve.
2. Check the circuit to VSV valve.
Was a problem found?
Trace this chart
from the start
after repair or
replace.
Go to Step 5
5
Is vacuum piping all right? (tank, hose, & pipe damage or trouble)
Go to Step 6
Trace this chart
from the start
after repair or
replace.
6
Does actuator work all right?
Trace this chart
from the start.
Disassemble axle
ASM for check.
Trace this chart
from the start
after repair or
replace.
4B1–32DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly Vacuum Piping and Electric Equipment
(For Push Button Type)
Vacuum Piping Diagram
C04RW013
VSV Assembly, Actuator Assembly
412RS032
Vacuum Tank
412RS033
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