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