Isuzu KB P190. Manual - part 1072

7A2-4   TRANSMISSION CONTROL SYSTEM (JR405E)

Clutch, Brake, Solenoid and Pressure Switch Logic

Clutch status

Brake status

Selector 

position

Selected gear 

position

High clutch

Low clutch

Reverse clutch

Low one-way 

clutch

Low & reverse 

brake

2-4 brake

P

-

R

Reverse

{

{

N

-

D

1st

{

{ *1

2nd

{

{

3rd

{

{

4th

{

{

3

1st

{

{ *1

2nd

{

{

3rd

{

{

2

1st

{

{ *1

2nd

{

{

L

1st

{

{ *1

{

{= Applied 
*1= Holding 

Solenoid command

Transmission fluid pressure (TFP) 

switch

Selector 

position

Selected gear 

position

Low & 

reverse 

brake

2-4 brake

High clutch

Low clutch

Low & 

reverse 

brake

2-4 brake

High clutch

P

-

{

{

{

R

Reverse

{

{

{

N

-

{

{

{

D

1st

{

{

{

2nd

{

{

{

3rd

{

{

{

4th

{

{

{

{

3

1st

{

{

{

2nd

{

{

{

3rd

{

{

{

2

1st

{

{

{

2nd

{

{

{

L

1st

{

{

{

{= Command On

{= On (closed)

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-5

Diagnostic Trouble Code (DTC) List

DTC

Flash Code

DTC Descriptor

P0560

16

System Voltage Malfunction

P0602

—

Control Module Programming Error

P0705

17

Inhibitor Switch Malfunction

P0710

15

Transmission Fluid Temperature Sensor Circuit Malfunction

P0717

14

Input/Turbine Speed Sensor “A” Circuit No Signal

P0722

11

Output Speed Sensor Circuit No Signal

P0727

13

Engine Speed Sensor Input Circuit No Signal

P0731

41

Gear 1 Incorrect Ratio

P0732

42

Gear 2 Incorrect Ratio

P0733

43

Gear 3 Incorrect Ratio

P0734

44

Gear 4 Incorrect Ratio

P0748

35

Line Pressure Solenoid Malfunction

P0753

31

Low & Reverse Brake Duty Solenoid Malfunction

P0758

32

2-4 Brake Duty Solenoid Malfunction

P0763

33

High Clutch Duty Solenoid Malfunction

P0768

34

Low Clutch Duty Solenoid Malfunction

P1120

22

Throttle Position Signal Malfunction

P1750

51

Low & Reverse Brake Fail Safe Valve Malfunction

P1755

52

2-4 Brake Fail Safe Valve Malfunction

P1853

26

Low & Reverse Brake Pressure Switch Malfunction

P1858

27

2-4 Brake Pressure Switch Malfunction

P1860

36

Lock Up Duty Solenoid Malfunction

P1863

28

High Clutch Pressure Switch Malfunction

P1875

25

Ground Return Malfunction

7A2-6   TRANSMISSION CONTROL SYSTEM (JR405E)

Schematic and Routing Diagrams

Transmission Controls Schematics

Power Distribution (1)

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-7

Power Distribution (2)