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