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.