Isuzu KB P190. Manual — part 1219

7D1-2 TRANSFER CONTROL SYSTEM

Service Precaution

WARNING:
THIS VEHICLE HAS A SUPPLEMENTAL RESTRAINT
SYSTEM (SRS). REFER TO THE SRS COMPONENT AND
WIRING LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS WIRING.
WHEN YOU ARE PERFORMING SERVICE ON OR NEAR
THE SRS COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO FOLLOW
WARNINGS COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR OTHERWISE
UNNECESSARY SRS SYSTEM REPAIRS.

CAUTION:
Always use the correct fastener in the proper location.
When you replace a fastener, use ONLY the exact part
number for that application. ISUZU/GM will call out those
fasteners that require a replacement after removal.
ISUZU/GM will also call out the fasteners that require
thread lockers or thread sealant. UNLESS OTHERWISE
SPECIFIED, do not use supplemental coatings (Paints,
greases, or other corrosion inhibitors) on threaded
fasteners or fastener joint interfaces. Generally, such
coatings adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When you
install fasteners, use the correct tightening sequence and
specifications. Following these instructions can help you
avoid damage to parts and systems.

TRANSFER CONTROL SYSTEM 7D1-3

General Description

RTW77DLF000501

Transfer Position and Drive Mode

Three drive modes can be selected through operation of 4WD switch.

Transfer Position

4WD SWITCH

Mode

Drive mode

2H

RWD

Rear wheel drive

HIGH

4H 4WD

(HIGH)

High-speed mechanical
lock-up four wheel drive

LOW 4L

4WD

(LOW)

Low-speed mechanical
lock-up four wheel drive

NEUTRAL

2H & 4L (10 Sec)

NEUTRAL

Towed by other vehicle

7D1-4 TRANSFER CONTROL SYSTEM

Summary of transfer control system
The transfer control system switches between the 2-wheel
drive (2H), 4-wheel drive high-speed (4H), 4-wheel drive low-
speed (4L), and neutral positions electrically when the driver
operates the switches.
This system has following functions.
1. Connection or disconnection of drive force distribution to the

front wheel front shaft (axle shaft). (The drive force

distribution to the front propeller is connected or

disconnected with the motor actuator.)

2. Try to repeat the connection or disconnection of the front

wheel drive function as described above.

3. Option: Shift on the fly type only.

Instruction of connection or disconnection of the drive force

transmission between the front wheel axle (axle shaft) and

front wheel. (The motor actuator connects or disconnects

the left front wheel and front wheel axle (axle shaft).)

4. Shifting of auxiliary transmission gears, connection or

disconnection of wheel and engine drive force (4H, 4L,

neutral).

5. Operation of the indicator on the instrument panel.

6. Transmission of the position signal to other controllers.

TRANSFER CONTROL SYSTEM 7D1-5

System Components

Parts Location

RTW57DLF000401

Speed sensor
Revolutions of the rear output shaft are decreased and taken
out by the speed/drive/driven gears installed in the transfer
case. The number of revolutions is detected with a speed
sensor.
About 4/3 pulses per revolution of the shaft are output.

4WD switch
The 4WD switch detects the movement of the shift rod driving
the 4

×2 - 4×4 sleeve.

PUSH open is achieved with the PUSH open switch when the
shift rod is at the 4

×2 position.

4

××××2 - 4××××4 sleeve & Arm

The 4

×2 - 4×4 sleeve moves directly in the 4×4 direction with