Isuzu KB P190. Manual — part 1060

CONSTRUCTION AND FUNCTION 7A1-1

SECTION 7A1

CONSTRUCTION AND FUNCTION (JR405E)

TABLE OF CONTENTS

PAGE

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 3

Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . ...7A1- 3

Main Data and Specification . . . . . . . . . . . . . . . . . . . . . .7A1- 4

Number Plate Location . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 5

Electronic Control Components Location . . . . . . . . . . . . . . . ...7A1- 6

Transmission Control Module (TCM) Peripheral Circuit . . . . . . . . . . .7A1- 7

Structure and Function of Component . . . . . . . . . . . . . . . . . . .7A1- 8

Torque Converter (with Lock-up Function) . . . . . . . . . . . . . . . .7A1- 8

Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7A1- 9

Input Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 10

Output Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . ...7A1- 10

Gear Shifting Mechanism . . . . . . . . . . . . . . . . . . . . . . ..7A1- 10

Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 14

Oil Passage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7A1- 19

Parking Function . . . . . . . . . . . . . . . . . . . . . . . . . . 7A1- 20

Inhibitor Switch . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 21

Turbine Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . ...7A1- 22

Speed Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . .7A1- 22

Accelerator Pedal Position Sensor . . . . . . . . . . . . . . . . . . ..7A1- 23

Engine Speed Sensor (=CKP Sensor) . . . . . . . . . . . . . . . . . ..7A1- 23

Brake Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 24

Mode Select Switch . . . . . . . . . . . . . . . . . . . . . . . . ...7A1- 24

Transmission Control Module (TCM) . . . . . . . . . . . . . . . . . ...7A1- 25

Control Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 7A1- 26

Content of Function and Control . . . . . . . . . . . . . . . . . . . ..7A1- 26

Control Item, Input and Output . . . . . . . . . . . . . . . . . . . . .7A1- 29

Line Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . 7A1- 30

Lock-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . .7A1- 30

Direct Electric Shift Control (DESC) . . . . . . . . . . . . . . . . . . .7A1- 31

7A1-2 CONSTRUCTION AND FUNCTION

PAGE

Learning Function . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 33

Major Input/Output Component and Their Functions . . . . . . . . . . . .7A1- 34

Control Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . ..7A1- 35

Gear Train (Transmission Mechanism) Operation and Hydraulic Circuit . . . . ..7A1- 36

Construction and Operation . . . . . . . . . . . . . . . . . . . . . .7A1- 36

Component Name and Function . . . . . . . . . . . . . . . . . . . ...7A1- 36

Component and Their Operating Condition . . . . . . . . . . . . . . . 7A1- 37

CONSTRUCTION AND FUNCTION 7A1-3

DESCRIPTION

CONSTRUCTION

1

Converter Housing

6 Low Clutch

11 Oil Pump

2

Torque Converter

7 Low & Reverse Brake

12 Control Valve

3

High Clutch

8 Output Shaft

13 Low One-way Clutch

4

Reverse Clutch

9 Extension Housing

14 Parking Gear

5

2-4 Brake

10 Input Shaft

Figure 1. Construction of Automatic Transmission

The JR405E automatic transmission is electrically controlled by a microcomputer transmission control module
(TCM). There are four forward speeds and one reverse speed.
This JR405E automatic transmission employs a clutch pressure direct control system (Direct Electronic Shift
Control: DESC) using duty cycle type solenoids, which ensure high shift quality.
This transmission also has a learning function and constantly checks the time of each clutch and brake
required for the shift in order to match this time with the target value for the optimum shift.

The TCM will automatically select the most appropriate shift points and lock-up points depending on the
Accelerator pedal opening, the vehicle speed and the vehicle load.
If any trouble arises in the speed sensor, APP sensor, solenoid, etc., the fail-safe control function is activated
to keep the running performance.
Problems with the sensors or the solenoids can quickly be detected with the self diagnosis procedure
described in this manual.

The JR405E automatic transmission consists of the torque converter, oil pump, input shaft, out put shaft,
planetary gears and control valves.
The gear train consists of two planetary gear sets and three multiple plate clutches in combination with two
multiple plate brakes and a one-way clutch.

2WD

4WD

7A1-4 CONSTRUCTION AND FUNCTION

MAIN DATA AND SPECIFICATION

Model

JR405E

Torque Converter Type

Three-Elements, One-Stage & Two-Phases

Type With Lock-up Function

Torque Converter Stall Torque Ratio

1.8

Name

ATF DEXRON III

Quantity

L (US gal/Imp gal)

9.2-9.6 (2.43-2.54/2.02-2.11)

ATF

Cooling System

Water Cooled Type (Radiator)

1st 2.785

2nd 1.545

3rd 1.000

4th (Over Drive)

0.694

Gear Ratio

Reverse 2.272

Low Clutch

L/C

7

High Clutch

H/C

5

Reverse Clutch

R/C

2

Number of Discs

Clutch

Low One-way Clutch

L/O.C

1

Set

Low & Reverse
Brake

L&R/B 6

Brake

2-4 Brake

2-4/B

5

Number of Discs

Sun Gear

33

Pinion
Gear

21

Front Planetary

Ring Gear

75

Sun Gear

42

Pinion
Gear

17

Planetary Gear Unit

Rear Planetary

Ring Gear

75

Number of Teeth