Isuzu KB P190. Manual - part 1061

CONSTRUCTION AND FUNCTION  7A1-5 

 

NUMBER PLATE LOCATION 

 

 

       

           

JATCO  CORP 

                     

     

     

        UK02

∗∗∗∗    

     

     

     

     

1

 

No.  1X80652       

       

       

         

 

2 3

 

4

 

 

1

→UK000 

UK020 = 2WD 

 

 

UK021 = 4WD 

 

2

→1  

Production Year   

  

1=2001 

  

2=2002 

  

3=2003 

  

4=2004 

  

5=2005 

  

6=2006 

  

7=2007 

 

3

→X  

Product  Month 

 

 

1～9=January～September 

  

X=October 

  

Y=November 

  

Z=December 

 

4

→80652 

Production Sequence Number 

 

Serial Number Location 
2WD:Back of the transmission rear mounting 
4WD:Left side of the transmission rear mounting 

Figure 2. Number Plate Location 

4WD 

2WD 

7A1-6  CONSTRUCTION AND FUNCTION 

ELECTRONIC CONTROL COMPONENTS LOCATION 

4WD Only 

4WD Only

 Instrument panel (Meter)  

 

 

 

 

 
 
 
Speed meter (2WD Only) 
Shift position indicator lamp 
POWER DRIVE, 3rd START 
indicator lamp 
A/T OIL TEMP indicator lamp 
CHECK TRANS indicator lamp 

 Brake pedal 

 
 
 
 
 
Brake Switch 

 Transmission Control Module (TCM)

 

 Electrical source 

 
 
 
 
 
 
Ignition 
Battery voltage 

Speed sensor 
Turbine sensor 
Inhibitor switch 
ATF thermo sensor 
High clutch oil pressure switch 
2-4 brake oil pressure switch 
Low & Reverse brake oil pressure 
switch 

Line pressure solenoid 
Low clutch solenoid 
High clutch solenoid 
2-4 brake solenoid 
Low & Reverse brake solenoid 
Lock-up solenoid 

 Transmission 

 Transfer Control Module 

 Transfer 

 
 
 

 
4L mode switch 

 Engine 

 
 
 
 
Engine speed sensor 
Accelerator pedal Position Sensor
 
 

 Engine Control Module (ECM)

 Data link connector 

 Select lever 

 
 

 
 
 
 
 
 

Power Drive, 3rd Start select switch 

 

Figure 3. Electronic Control Components Location 

CONSTRUCTION AND FUNCTION  7A1-7 

 

TRANSMISSION CONTROL MODULE (TCM) PERIPHERAL CIRCUIT 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 4. TCM Peripheral Circuit 

 

 

7A1-8  CONSTRUCTION AND FUNCTION 

STRUCTURE AND FUNCTION OF COMPONENT 

TORQUE CONVERTER (WITH LOCK-UP FUNCTION) 

• The torque converter is a device for transmitting the engine torque to the transmission. It transmits power 

by means of oil when the lock-up clutch is disengaged, and by means of a lock-up clutch when it is 
engaged. 

• The torque converter is of the symmetrical, three-element, single-stage, two-phase type. 
• As shown in the drawing, the symmetrical three-elements refer to three elements (components) consisting 

of impeller (1), turbine (2) and stator (3) that are arranged symmetrically (figure 5). 

• "Single-stage" means that there is only one turbine as an output element; "two-phase" means that the 

pump impeller acts as a torque converter when the turbine speed is comparatively low, and as a fluid 
coupling when the speed is high. 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

1. Pump Impeller 
2. Turbine Runner 
3. Stator 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

1. Pump Impeller 
2. Turbine Runner 
3. Stator 
4. Converter Cover 
5. One-way Clutch 
6. Lock-up Piston 
7. Torsion Damper

 

Figure 5. Torque Converter 

 

Figure 6. Construction of Torque Converter 

 

Lock-up mechanism 

• "Lock-up" refers to a fixed state of the lock-up clutch inside the torque converter and thus connects the 

engine directly to the transmission. 

• The hydraulic pressure for the lock-up control is supplied from two circuits. 

 

When the lock-up clutch is disengaged (Figure 7) 

• When the lock-up is disengaged, the torque converter operating pressure is supplied from the oil passage 

(A) to between the cover and the lock-up piston, and separates the lock-up piston clutch facing and 
converter cover. 

• As a result, the engine drive power is transmitted from the converter cover to the pump impeller, to the 

ATF and to the turbine. The torque converter functions as a fluid connector in this condition. 

• The torque converter operating pressure is supplied from oil passage (A), and passes through oil passage 

(B). 

 

When the lock-up clutch is engaged (Figure 8) 

• When the lock-up is engaged, the torque converter operating pressure is supplied from oil passage (B) to 

the oil pump impeller, the turbine, and then to the stator side. The oil between the lock-up piston and 
converter cover is drained. 

• Since the force acting on the right side of the lock-up piston is greater than the force on the left side, it 

connects the lock-up piston clutch facing with the converter cover, thereby increasing the transmission 
efficiency.