4WD ISUZU TF SERIES 2004 Manual Online

TRANSFER CONTROL SYSTEM 7D1-17
Skip operation limitations (4L




2H) (Vehicle speed, engine speed, and transmission position not
specified)

Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detection
(limit)
switches
LS1, LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummyRemarks
4L Off On Off Off Open 1,1,0,1 Closed Open Closed -----
4L start of
operation Off On Off Off 2H
position
for 0.1
second 1,1,0,1 Closed Open Closed -----
10
second
display
during
limitation Blinking
(4HZ) Off Off Off Open 1,1,0,1 Closed Open Closed No
operation
during
limitation
Go to 4L
after 10
seconds
Off ON Off Off Open 1,1,0,1 Closed Open Closed -----

Skip operation limitations (2H




4L) (Vehicle speed, engine speed, and transmission position not
specified)

Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detection
(limit)
switches
LS1, LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummyRemarks
2HL Off Off Off Off Open 1,0,1,0 Open Open Open -----
4L start of
operation Off Off Off Off 2H
position
for 0.1
second 1,0,1,0 Open Open Open -----
10
second
display
during
limitation Blinking
(4HZ) Blinking
(4HZ) Off Off Open 1,0,1,0 Open Open Open No
operation
during
limitation
Go to 2H
after 10
seconds
Off Off Off Off Open 1,0,1,0 Open Open Open -----


Under some conditions, a secondary operational indication may be received when the 4Hz operational
indication is present.

7D1-18 TRANSFER CONTROL SYSTEM
Transfer-related indicator lamp and switch function
2H
Neutral
2H
Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detectio
n (limit)
switches
LS1,
LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummy Remarks
2H Off Off Off Off No
operation1,0,1,0 Open Open Open -----
Neutral
start of
operation Off Off Off Off Neutral
position
for 10
seconds1,0,1,0 Open Open Open Switch
operation
sensor
Start of
operation Off Off Blinking
(2HZ) Off No
operation1,1,1,0
0,0,1,0
0,1,1,0
0,1,1,1 Open Open Open 2H to 4H
while
driving
During
operation
(Synchro) Off Off Blinking
(2HZ) Off No
operation1,1,1,0
0,0,1,0
0,1,1,0
0,1,1,1 Open Open Open 2H to 4H
using
synchro
and retrial
During
operation
(Passing
through
4H) Off Off Blinking
(2HZ) Off No
operation0,0,1,1 Closed Open Closed -----
During
operation
(Passing
through
4H) Off Off Blinking
(2HZ) Off No
operation0,0,0,1
0,1,0,1 Closed Open Closed 4H to 4L
while
driving
During
operation
(N)
Off Off Blinking
(2HZ) Off No
operation
0,0,0,1
0,1,0,1 Closed Closed Closed
4H to 4L
through
neutral
During
operation
(N) Off Off Blinking
(2HZ) Off No
operation0,1,0,0 Closed Closed Closed Switch
operation
sensor
Neutral Off Off On Off No
operation0,1,0,0 Closed Closed Open -----
2H start of
operation Off Off On Off 2H
position
for 10
seconds0,1,0,0 Closed Open Closed Switch
operation
sensor
During
operation
(Passing
through
N) Off Blinking
(2HZ) Off Off No
operation0,1,0,0 Closed Closed Closed 4L to 4H
through
neutral
During
operation Off Blinking
(2HZ) Off Off No
operation0,1,0,1
0,0,0,1 Closed Closed Closed 4L to 4H
while
driving

TRANSFER CONTROL SYSTEM 7D1-19
Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detectio
n (limit)
switches
LS1,
LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummy Remarks
During
operation
(4H
waiting) Off Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Closed Closed 4L to 4H
while
waiting
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation0,1,1,1
0,1,1,0
0,0,1,0
1,1,1,0 Closed Open Closed 2H to 4H
while
driving
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation0,1,1,1
0,1,1,0
0,0,1,0
1,1,1,0 Open Open Closed Axle
driving
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation1,0,1,0 Open Open Closed -----
2H Off Off Off Off No
operation1,0,1,0 Open Open Open -----


Operational restrictions (vehicle speed, engine speed, and transmission position) are applicable to transfer
shifts in both directions (H
Neutral
L).

7D1-20 TRANSFER CONTROL SYSTEM
4H




Neutral




4H
Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detection
(limit)
switches
LS1, LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummyRemarks
4H On Off Off Off No
operation0,0,1,1 Closed Open Closed -----
Neutral
start of
operation On On Off Off Neutral
position
for 10
seconds 1,1,0,1 Closed Open Closed -----
Start of
operation Off Off Blinking
(2HZ) Off No
operation1,1,0,0 Closed Open Closed 4L to N
while
driving
During
operation
(N) Off Off Blinking
(2HZ) Off No
operation1,1,0,0 Closed Closed Closed 4L to N
with axle
driving
During
operation
(N) Off Off Blinking
(2HZ) Off No
operation0,1,0,0 Closed Closed Closed 4L to 4N
with axle
removed
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation0,1,1,1
0,1,1,0
0,0,1,0
1,1,1,0 Open Open Closed Axle
driving
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation1,0,1,0 Open Open Closed -----
Neutral Off Off On Off No
operation0,1,0,0 Closed Closed Open -----
4H start
of
operation Off Off Off Off 2H
position
for 10
seconds 0,1,0,0 Open Open Open Switch
operation
sensor
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation1,1,0,0 Closed Closed Open 4L to 4H
through
neutral
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation0,1,0,0 Closed Closed Open 4L to 4H
through
neutral
During
operation Off Blinking
(2HZ) Off Off No
operation0,1,0,1
0,0,0,1 Closed Closed Open 4L to 4H
while
driving
4H
waiting Blinking
(2HZ) Off) Off Off No
operation0,0,1,1 Closed Closed Open 4L to 4H
while
waiting
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation0,0,1,1 Closed Open Open Axle
driving
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation0,0,1,1 Closed Open Open -----
4H On Off Off Off No
operation0,0,1,1 Closed Open Closed -----

7D1-22 TRANSFER CONTROL SYSTEM
4L




Neutral




4L

Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
warning
light 4WD
switch Actuator
detection
(limit)
switches
LS1, LS2,
LS3. and
LS4
1 = on
2 = off Transfer
4WD
switch Transfer
neutral
switch SOF
actuator
switch
Or
Axle
dummyRemarks
4L On On Off Off No
operation1,1,0,1 Closed Open Closed -----
Neutral
start of
operation On On Off Off Neutral
position
for 10
seconds 1,1,0,1 Closed Open Closed -----
Start of
operation Off Off Blinking
(2HZ) Off No
operation1,1,0,0 Closed Open Closed 4L to N
while
driving
During
operation
(N) Off Off Blinking
(2HZ) Off No
operation1,1,0,0 Closed Closed Closed 4L to N
with axle
driving
During
operation
(N) Off Off Blinking
(2HZ) Off No
operation0,1,0,0 Closed Closed Closed 4L to 4N
with axle
removed
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation0,1,0,0 Closed Closed Closed Axle
driving
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation0,1,0,0 Closed Closed Closed -----
Neutral Off Off On Off No
operation0,1,0,0 Closed Closed Open -----
4L start of
operation Off Off On Off 4L
position
for 10
seconds 0,1,0,0 Open Open Open Switch
operation
sensor
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation1,1,0,0 Closed Closed Open 4H to 4L
through
neutral
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation1,1,0,0 Closed Closed Open 4H to 4L
through
neutral
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation1,1,0,0 Closed Closed Open 4H to 4L
through
neutral
4H
waiting On Blinking
(2HZ) Off Off No
operation1,1,0,1 Closed Closed Open 4L while
waiting
During
operation
(Axle) Blinking
(2HZ) Off Off Off No
operation1,1,0,1 Closed Open Open Axle
driving
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation1,1,0,1 Closed Open Open -----
4H On On Off Off No
operation1,1,0,1 Closed Open Closed -----

Operational restrictions (vehicle speed, engine speed, and transmission position) are applicable to transfer
shifts in both directions (H
Neutral
L).

TRANSFER CONTROL SYSTEM 7D1-31
CONNECTOR LIST
No. Connector face No. Connector face
B-24
Green
Meter-B C-57
(4JH1-
TC)
ECM
B-54
White
J/B I2 C-67
BlackEHCU
B-62
White
Ignition switch (IGSUB : G1) C-94
(4JH1-
TC)
Gray TCM
B-63
White
Ignition switch (IGSUB : G2) C-95
(6VE1)
WhiteTCM
B-64
Silver
Weld splice 1(Illumination) C-107
WhiteJ/B E2
B-65
Silver
Weld splice 2 (Ground) C-108
WhiteJ/B E1
B-66
White
4WD switch C-109
SilverBody-LH ; ground
C-2
Silver
Engine room-RH ; Ground C-118
(4JH1-
TC)
WhiteA/C Resister & Neutral switch
C-36
Silver
Engine room-LH ; Ground C-119
(6VE1)
BlackAuto cruise actuator
C-56
(4JH1-
TC)
Gray
ECM R-15
BlackTransfer controller

7D1-32 TRANSFER CONTROL SYSTEM

No. Connector face No. Connector face
R-14
Black
Transfer controller H-3
(4JH1-
A/T)
WhiteBattery (+)  Engine room
E-10
Silver
Engine ground H-4
(4JH1)
WhiteEngine  Engine room
E-11
(4JH1)
(C24SE)
Natural
Green

Neutral switch H-6
White
Engine room 
INST
E-12
(4JH1)
(C24SE)
Natural
Green
Neutral switch H-7
WhiteEngine room 
INST
E-35
(4JH1-
TC
C24SE)
Black
Motor actuator H-22
(4JA1/H
1-M/T)
Gray Engine 
Engine room C
E44
Gray
Vehicle speed sensor H-23
(4JA1-L)
Engine room B 
T/mission
E-45
White
4WD switch H-29
(4JH1-
M/T)
WhiteBattery (+)  Engine room C
E-46
Brown
H-L neutral switch H-31
(6VE1)
WhiteEngine room 
T/mission
E-51
Black
Inhibiter switch H-32

WitheEngine room  Rear body
E-61
(6VE1)
Black
ECM P-1
SilverBattery (+)

TRANSFER CONTROL SYSTEM 7D1-33

No. Connector face No. Connector face
P-2
Silver
Relay & Fuse box


P-5
Silver
Battery (-)


P-6
Silver
Body earth (Ground)


P-10
Silver
Engine ground


P-13
(4JH1)
Gray
Shift on the fly actuator


R-14

Black 2-4WD Control unit


R-15

Black 2-4WD Control unit

7D1-34 TRANSFER CONTROL SYSTEM

Diagnosis
Before determining a trouble (Non-trouble mode)
1. When shifting from 2H to 4H:
1-1-1 When the flashing frequency of the 4WD indicator is changed from 2Hz to 4Hz (Shft on the fly)
If the load is too large to shift the gears synchronously, the operation is repeated up to 3 times. If the shifting
is not effected after being repeated 3 times, the indicator frequency is changed from 2Hz to 4Hz and, at the
same time, the actuator condition is changed to 2H, indicator flashes at 4Hz for 10 seconds, and then goes
out.
Cause of excessive synchronous shifting load

Extremely low temperature (the oil viscosity of the front differential increases requiring a large load for
synchronization)
 High speed (since the difference of relative revolutions of gears to be shifted synchronously is too large,
required work load per unit time becomes larger).
Step 1-1-1:
Stop the vehicle or decrease the speed and operate as required again.

1-1-2 When the flashing frequency of the 4WD indicator is changed from 2Hz to 4Hz (Rigid and free wheel
Hub) / Block out of meshing spline.
Step 1-1-2:
Run the vehicle forward and backward several meters and operate as required again.

1-2 When the flashing of 4WD indicator at 2Hz continues more than 11.5 seconds (repetition of 3 times of
above No.1 is counted) (Shift on the fly)
If there is difference of revolutions and phases between the front wheel and axle, connecting the front wheel
and axle is difficult.
Until shifting in the transfer and connection of the front wheel and axle are completed

, the indicator flashes
at a frequency of 2Hz. In the above case, the indicator continues flashing at a frequency of 2Hz until the
connection of the front axle is completed. (If the shifting in the transfer is not completed, the flashing
frequency is changed to 4Hz (above No.1).)
By correcting the difference of relative revolutions and deviation of phases, the shifting can be completed.
Step 1-2:
While the vehicle is running, make sure of safety around the vehicle and accelerate or decelerate the
vehicle while going straight.
When the vehicle is at a stop, run the vehicle forward and backward several meters.

2.
When shifting from 4H to 2H
2-1 When 4WD indicator continues flashing at 2Hz
When shifting from 4H to 2H, the 4WD indicator continues flashing at 2Hz until separation in the transfer and
the separation of the front wheel axle are completed
. When torsional torque is accumulated in the drive
system, separation in the transfer and separation of the front axle
is difficult. In such a case, they can be
separated by removing the torsional torque of the drive system.
Step 2-1:
While the vehicle is running, make sure of safety around the vehicle and accelerate or decelerate the
vehicle while going straight.
When the vehicle is in stop, run the vehicle several meters forward and backward.


: Shift on the fly only.

7D1-38 TRANSFER CONTROL SYSTEM
6. When shifting from neutral to 2H, 4H or 4L
6-1 When the 4L indicator or 4WD indicator flashes at 2Hz
Indicator flashing at 2Hz indicates that the engagement of the splines has not completed because of
deviation of the spline phases. By eliminating such a deviation, shifting is completed (same as in the step 3-1
and 4-1).
6-2 When the 4L indicator or 4WD indicator flashes at 4Hz
As in the case of shifting from 4L to 4H, restriction is imposed to the operation to 4L or 4H (including 2H). If
the transmission lever is at a running range and engine speed is high (3000rpm or more) while the vehicle is
running, operation from neutral of the transfer to the 4L or 4H (including 2H) is impossible (restriction on
operation).

Step 6-2:
Stop the vehicle.
(In case of AT): Set the transmission select lever to the N (or P) position.
(In case of MT): Set the transmission lever to the neutral position (at this time, stepping on the clutch
is recommended).
Keep pushing the4H or 4L or 2H button for 10 second.