Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1726

CONSTRUCTION AND FUNCTION 7A1-1

SECTION 7A1

CONSTRUCTION AND FUNCTION

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 UNIT (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
THROTTLE POSITION SENSOR (TPS) . . . . . . . . . . . . . . . . . . . ..7A1- 23
ENGINE SPEED SENSOR (=TDC 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

7A1-2 CONSTRUCTION AND FUNCTION

PAGE

LOCK-UP CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7A1- 30
DIRECT ELECTRIC SHIFT CONTROL (DESC) . . . . . . . . . . . . . . . . .7A1- 31
LEARNING CONTROL . . . . . . . . . . . . . . . . . . . . . . . ... 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 a duty cycle type solenoid, which ensures high shift quality.
This transmission also controls learning and constantly checks the time of each clutch and brake required for
the speed change to match this time with the target value for the optimum speed change.

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

The JR405E automatic transmission consists of the torque converter, the oil pump, the input shaft, the out put
shaft, the planetary gears and the control valve.
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 Phase Type

With Lock-up Function

Torque Converter Stall Torque Ratio

1.8

Name

ATF DEXRON

Quantity

9.2L-9.6L

ATF

Cooling System

Water Cooled Type (Radiator)

1st 2.786

2nd 1.546

3rd 1.000

4th (Over Drive)

0.694

Gear Ratio

Reverse 2.273

Low Clutch

L/C

7

High Clutch

H/C

5

Reverse Clutch

R/C

2

Number of Disc

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 Disc

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