2004 ISUZU TF SERIES Trans axle

7D1-12 TRANSFER CONTROL SYSTEM
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
During
operation On Blinking
(2HZ) Off Off No
operation 1,1,0,1 Closed Open Closed 4L to 4H
while
driving
During
operation
(N) Off Blinking
(2HZ) Off Off No
operation 1,1,0,0 Closed Closed Closed 4L to 4H
through
neutral
During
operation Off Blinking
(2HZ) Off Off No
operation 0,1,0,1
0,0,0,1 Closed Closed Closed 4L to 4H
while
driving
4H
waiting Off Blinking
(2HZ) Off Off No
operation 0,0,1,1 Closed Closed Closed
4L to 4H
while
waiting
4H On Off Off Off No
operation 0,0,1,1 Closed Open Closed -----
2H start
of
operation On Off Off Off 2H position
for 0.1
second 0,0,1,1 Closed Open Closed Switch
operation
sensor
Start of
operation Blinking
(2HZ) Off Off Off No
operation 0,1,1,1
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
operation 0,1,1,1
0,1,1,0
0,0,1,0
1,1,1,0 Open Open Closed Axle drive
Axle
waiting
Blinking
(2HZ) Off Off Off No
operation 1,0,1,0 Open Open Closed Axle
waiting
2H Off Off Off Off No
operation 1,0,1,0 Open Open Open -----

TRANSFER CONTROL SYSTEM 7D1-13
2H to 4H retrial

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
2H Off Off Off Off No
operation1,0,1,0 Open Open Open -----
4H start
of
operation Off Off Off Off 4H
position
for 0.1
second 1,0,1,0 Open Open Open -----
Start of
operation Blinking
(2HZ) Off Off 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)
(Go to 4H
if synchro
complete) Blinking
(2HZ) Off Off 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
X 2
Abandon
ed
operation
(2H) Blinking
(4HZ) Off Off Off No
operation1,0,1,0 Open Open Open Return to
2H
2H
indication
after
10second
s
Off Off Off Off No
operation1,0,1,0 Open Open Open -----

 Completion of transfer case H-L area and axle shift timing may cause some variation in 2Hz blinking pattern.

7D1-14 TRANSFER CONTROL SYSTEM
Operational limits (4H




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
4H On Off Off Off Open 0,0,1,1 Closed Open Closed -----
4H start
of
operation On Off Off Off 4L
position
for 0.1
second 0,0,1,1 Closed Open Closed -----
10
second
display
during
limitation On Blinking
(4HZ) Off Off Open 0,0,1,1 Closed Open Closed No
operation
during
limitation
Go to 4H
after 10
seconds
On Off Off Off Open 0,0,1,1 Closed Open Closed -----

Operational limits (4L





4H) (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 On On Off Off No
operation1,1,0,1 Closed Open Closed -----
4L start of
operation On On Off Off 4H
position
for 0.1
second 1,1,0,1 Closed Open Closed -----
10
second
display
during
limitation On Blinking
(4HZ) Off Off Open 1,1,0,1 Closed Open Closed No
operation
during
limitation
Go to 4L
after 10
seconds
On On Off Off No
operation1,1,0,1 Closed Open Closed -----


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

TRANSFER CONTROL SYSTEM 7D1-15
Transfer-related indicator lamp and switch function
Skip operation
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 -----
4L start of
operation Off Off Off Off 4L
position
for 0.1
second 1,0,1,0 Open Open Open Switch
operation
sensor
Start of
operation Blinking
(2HZ) Blinking
(2HZ) Off 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) Blinking
(2HZ) Blinking
(2HZ) Off 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 Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Open Open -----
During
operation
(Passing
through
4H) Off Blinking
(2HZ) Off Off No
operation0,0,1,1
0,1,0,1 Closed Open Open -----
During
operation
(N)
On Blinking
(2HZ) Off Off No
operation
0,0,1,1
0,1,0,1 Closed Open Closed -----
During
operation
(N) On Blinking
(2HZ) Off Off No
operation0,1,0,0 Closed Open Closed Switch
operation
sensor
During
operation
(N) On Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Open Closed 4H to 4L
while
driving
During
operation
(Axle
drive) Blinking
(2HZ) Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Open Open -----
Axle
waiting Blinking
(2HZ) Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Open Open -----
4L waiting On Blinking
(2HZ) Off Off No
operation1,1,0,1 Closed Closed Closed 4H to 4L
while
waiting
4L On On Off Off No
operation1,1,0,1 Closed Open Closed -----

7D1-16 TRANSFER CONTROL SYSTEM
Item 4WD
lamp 4L lampNeutral
lamp Check
4WD
lamp 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 start of
operation On On Off Off 2H
position
for 0.1
second 1,1,0,1 Closed Open Closed Switch
operation
sensor
During
operation Blinking
(2HZ) Blinking
(2HZ) Off Off No
operation1,1,0,1 Closed Open Closed 4L to 4H
while
driving
During
operation
(Passing
through
N) On Blinking
(2HZ) Off Off No
operation1,1,0,0 Closed Closed Closed 4L to 4H
through
neutral
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
(4H
waiting) Off Blinking
(2HZ) Off Off No
operation0,0,1,1 Closed Closed Closed 4L to 4H
while
waiting
During
operation
(Axle) Off while
waiting for
start of H
shift Blinking
(2HZ)
while
waiting for
start of H
shift 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) at
end of H
shift Off at end
of H shiftOff Off No
operation0,1,1,1
0,1,1,0
0,0,1,0
1,1,1,0 Closed 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 -----


Completion of transfer case H-L area and axle shift timing may cause some variation in 2Hz blinking pattern.

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).