Isuzu Rodeo UE. Manual — part 70
4B–11
DRIVELINE CONTROL SYSTEM
Connector List
No.
Connector face
No.
Connector face
B-8
H-11
B-19
H-15
C-4
H-18
C-15
H-32
C-16
I-1
C-31
I-2
C-32
I-19
H-9
M-11
M-10
M-12
4B–12 DRIVELINE CONTROL SYSTEM
Diagnosis of The Faults Based on the
Status of 4WD Indicator Lamp, 4WD
Switch and T/F Change Lever
Diagnosis charts are shown on below. If troubles can not
be solved after every chart was traced, troubles may
occur in the ECU. In this case, replace the ECU and trace
every chart again.
Fault on Switching from 2WD to 4WD
1. In case that 4WD indicator’s blinking changes
from 2Hz to 4Hz after Solution 1 is carried out.
Faults occur in the motor actuator or the transfer case
assembly. Remove the motor actuator and check
function. If problem was found and it was repaired, try
Solution 1 again. After that, disassemble the
transfer case assembly for check and repair or
replace. If incident is not improved after above
mentioned actions were taken, replace the ECU.
2. In case that 4WD indicator dose not blink nor
light, when switching from 2WD to 4WD.
Step
Action
Yes
No
1
Is ignition turned on?
Go to Step 2
Turn on the
ignition and trace
this chart from
start.
2
Dose the indicator light during two seconds initialization after
ignition is turned on?
Go to Step 3
Burning out of
indicator lamp or
disconnection of
harness wire.
Trace this chart
from the start
after repair or
replace.
3
Is the 4WD switch turned from 2WD to 4WD?
Short-circuit
(body short) on
harness of the
4WD switch.
Fault of the 4WD
switch (holding
the closed
condition).
Trace this chart
from the start
after repair or
replace.
Push the 4WD
switch to 4WD.
4B–13
DRIVELINE CONTROL SYSTEM
3. Case that the indicator keeps blinking by 2Hz after aforementioned Solution 2 is carried out.
Step
Action
Yes
No
1
Check the air pressure and wear of all tires.
Were problems found?
Try Solution 2
after adjust the
air pressure and
replace worn
tires.
Go to Step 2
2
Can the transfer lever be operated from High to 4L or vice versa?
Go to Step 3
Disconnection of
the motor
actuator harness
wiring. 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 of
transfer case.
Disassemble the
transfer case for
check. Trace this
chart from the
start after repair
or replace.
3
Pull out the hoses from vacuum actuator and operate 4WD
switch.
Is there negative pressure on either of hoses?
Go to Step 4
Faults on the
transfer position
switch or its
harness. Trace
this chart from
the start after
repair or replace.
Faults on the
VSV main body,
its harness or
vacuuming
system. Trace
the diagnosis
chart in Front
Axle ASM
section. After
that, trace this
chart from the
start.
4
Check the axle switch.
Were problems found?
Internal faults on
axle switch.
Trace this chart
from the start
after replace.
Disconnection on
the axle harness.
Trace this chart
from the start
after repair or
replace.
Faults on Front
Axle ASM. Trace
the diagnosis
chart in Front
Axle ASM
section. After
that, trace this
chart from the
start.
4B–14 DRIVELINE CONTROL SYSTEM
Fault on Switching from 4WD to 2WD
1. Case that indicator dose not blink nor turn out.
Step
Action
Yes
No
1
Dose the indicator turn out by ignition off?
Go to Step 2
Short circuit of
the indicator
harness.
2
Is the 4WD switch on 2WD position?
Disconnection on
the 4WD switch
harness or
breakdown of the
4WD switch in
open state.
Trace this chart
from the start
after repair or
replace.
Turn the 4WD
switch to 2WD
position. Trace
this chart from
the start.
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