Isuzu KB P190. Manual - part 1221

7D1-10 TRANSFER CONTROL SYSTEM

Transfer Actuator

Method of confirming the actuator position detection
(limit) switch
The actuator indicates the continuity condition of combinations,
as shown in the list below between the 4 detection (limit) switch
pins and the GND pin along the direction of the notch of the
output shaft spline. Check that these combinations are as
specified.
The middle condition between these positions (4 patterns in
the case of 2H-4H) is either of the combinations shown below,
depending upon manufacturing variations of the switch plate.

2H-4H

4H-N

N-L

Direction of output

shaft notch (outline)

-54

° to

-29

° to 74°

° to

110

° to 179°

179

° to

215

° to

285

° to

300

LS1

Open

LS2 Open

Open

LS3

Open

Open Open Open

LS4 Open

Open

Open Open Close

Continuity between each pin and GND pin. (Continuity also exists between CLOSE pins.)

Transfer Actuator Connector

7B4-PDF6

TRANSFER CONTROL SYSTEM 7D1-11

Method of checking the position detection switch harness
Disconnect the vehicle harness connector on the transfer
controller side, and the vehicle harness connector on the
transfer actuator side as shown in the wiring diagram. Check
the continuity between the following connector pins, ensure
there is no continuity between those pins and GND or power
source.
Check that there is continuity between the GND pin and the
vehicle GND on the transfer actuator, and there is no continuity
between the GND pin and another power source.

C-112 C-111

Vehicle harness connector pin No. (connector of mating parts of the harness is shown in this figure)

Name of pin

T/F controller side

T/F actuator side

Remarks

LS1 C-112,

LS2 C-112,

LS3 C-112,

LS4 C-112,

GND

C-111, 1, 9

7D1-12 TRANSFER CONTROL SYSTEM

Functions of Switch and indicator Lamp

Transfer-related indicator lamp and switch function

Item

4WD

lamp

4L lamp

Neutral

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

Axle

dummy

Remarks

Off

operation

1,0,1,0

Open

-----

4H start

operation

Off Off Off Off

4H position

for 0.1

second

1,0,1,0 Open Open Open

Switch

operation

sensor

Start of

operation

Blinking

(2HZ)

Off Off Off

operation

1,1,1,0

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)

Off Off Off

operation

1,1,1,0

0,0,1,0

0,1,1,0

0,1,1,1

Open Open Open

2H to 4H

using

synchro

and

retrial

During

operation

(Axle

drive)

Blinking

(2HZ)

Off Off Off

operation

0,0,1,1 Closed Open Open

Axle

drive

Axle

waiting

Blinking

(2HZ)

Off Off Off

operation

0,0,1,1 Closed Open Open

Axle

drive

Off

operation

0,0,1,1

Closed

Open

Closed

-----

4L start

operation

On Off Off Off

4L position

for 0.1

second

0,0,1,1 Closed Open Closed

Switch

operation

sensor

Start of

operation

Blinking

(2HZ)

Off Off

operation

0,0,0,1

0,1,0,1

Closed Open Closed

4H to 4L

while

driving

During

operation

(N)

Off

Blinking

(2HZ)

Off Off

operation

0,0,0,1

0,1,0,1

Closed Closed Closed

4H to 4L

through

neutral

During

operation

(N)

Off

Blinking

(2HZ)

Off Off

operation

0,1,0,0 Closed Closed Closed

4H to 4L

through

neutral

During

operation

(N)

Off

Blinking

(2HZ)

Off Off

operation

1,1,0,0 Closed Closed Closed

4H to 4L

through

neutral

waiting

Blinking

(2HZ)

Off Off

operation

1,1,0,1 Closed Closed Closed

4H to 4L

while

waiting

Off

operation

1,1,0,1

Closed

Open

Closed

-----

4H start

operation

On Off Off Off

4H position

for 0.1

second

1,1,0,1 Closed Open Closed

Switch

operation

sensor

TRANSFER CONTROL SYSTEM 7D1-13

Item

4WD

lamp

4L lamp

Neutral

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

Axle

dummy

Remarks

During

operation

Blinking

(2HZ)

Off Off

operation

1,1,0,1 Closed Open Closed

4L to 4H

while

driving

During

operation

(N)

Off

Blinking

(2HZ)

Off Off

operation

1,1,0,0 Closed Closed Closed

4L to 4H

through

neutral

During

operation

Off

Blinking

(2HZ)

Off Off

operation

0,1,0,1

0,0,0,1

Closed Closed Closed

4L to 4H

while

driving

waiting

Off

Blinking

(2HZ)

Off

operation

0,0,1,1

Closed

4L to 4H

while

waiting

Off

operation

0,0,1,1

Closed

Open

Closed

-----

2H start

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

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

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

operation

1,0,1,0

Open

Closed

Axle

waiting

Off

operation

1,0,1,0

Open

-----

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