2007 ISUZU KB P190 Workshop Repair Manual

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Page 4241 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 7A1-2 CONSTRUCTION AND FUNCTION
PAGE
Learning Function ......................................................................................................7A1- 33
Major Input/Output Component

Page 4242 of 6020

ISUZU KB P190 2007 Workshop Repair Manual CONSTRUCTION AND FUNCTION 7A1-3

DESCRIPTION
CONSTRUCTION

1 Converter Housing 6 Low Clutch 11 Oil

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ISUZU KB P190 2007 Workshop Repair Manual 7A1-4 CONSTRUCTION AND FUNCTION
MAIN DATA AND SPECIFICATION
Model JR405E
Torque Converter Type Three-Elements, One-Stage & Two-Phases
Type W ith Lock-up Function
Torque Converter Stall Torque R

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ISUZU KB P190 2007 Workshop Repair Manual CONSTRUCTION AND FUNCTION 7A1-5

NUMBER PLATE LOCATION

JATCO CORP

UK02
∗
∗∗
∗

1
No. 1X80652

23 4

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ISUZU KB P190 2007 Workshop Repair Manual 7A1-6 CONSTRUCTION AND FUNCTION
ELECTRONIC CONTROL COMPONENTS LOCATION
4WD Only 4W D Only
Instrument panel (Meter)

Speed meter (2WD Only)
Shift position indicator lamp
POWER

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ISUZU KB P190 2007 Workshop Repair Manual CONSTRUCTION AND FUNCTION 7A1-7

TRANSMISSION CONTROL MODULE (TCM) PERIPHERAL CIRCUIT

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ISUZU KB P190 2007 Workshop Repair Manual 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 transmis

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 pass age
(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.

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ISUZU KB P190 2007

Page 4248 of 6020

ISUZU KB P190 2007 Workshop Repair Manual CONSTRUCTION AND FUNCTION 7A1-9

Figure 7. Lock-up Control (Disengaged) Figure 8. Lock-up Control (Engaged)
OIL PUMP
• The oil pump generating oil pressure is a small-size trochoid gear

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