Isuzu KB P190. Manual - part 1064

CONSTRUCTION AND FUNCTION  7A1-17 

 

ATF Thermo Sensor 

• The ATF thermo sensor detects the ATF temperature in the oil pan and sends a signal to the TCM. 
• The ATF thermo sensor is of the thermister type and the resistance value changes according to the ATF 

oil temperature. 

• When the ATF temperature is cold, the sensor resistance is high.    When the ATF temperature increases, 

the sensor resistance decreases. 

• When the ATF temperature increases to 135°C (275°F), the TCM lights up the ATF temperature warning 

lamp in the meter.  When the ATF temperature decreases below 125

°C (257°F), the ATF temperature 

warning lamp switches off. 

• The ATF thermo sensor is installed to the lower control valve body and integrated with the harness 

assembly. 

 

 
 
 
 
 
 
 
 
 
 
 
 

10.0

100.0

1,000.0

10,000.0

100,000.0

-30

-20

-10

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

ATF Temperature (°C)

R

esistance (

Ω

)

Figure 29. Characteristic of Thermo Sensor 

 

 

Figure 30. Location of Thermo Sensor 

ATF Temperature 

 (deg. C) 

Resistance (Ohm) 

(Approximately) 

ATF Temperature 

 (deg. C) 

Resistance (Ohm) 

(Approximately) 

-30              29,614

100

190 

-20  

16,705

110

149 

-10 9,842

120

118 

0  

6,028

128

98 

20  

2,500

130

94 

40  

1,160

135

84 

50  

819

140

76 

60 591

145

68 

80 324

150

62 

7A1-18  CONSTRUCTION AND FUNCTION 

Terminal Assembly 

Pin No. 

Connected to 

Connected TCMPin No. 

6 

Line Pressure Solenoid 

B23 

12 

Low & Reverse Brake Oil Pressure Switch 

B12 

5 

Low & Reverse Brake Duty Solenoid 

B6 

11 Ground 

Return 

B22 

4 

Lock-up Duty Solenoid 

B17 

10 

High Clutch Duty Solenoid 

B8 

3 

Low Clutch Duty Solenoid 

B9 

9 

2-4 Brake Duty Solenoid 

B7 

2 Oil 

Thermo 

Sensor 

B4 

8 

Oil Thermo Sensor Ground 

B14 

1 

High Clutch Oil Pressure Switch 

B20 

7 

2-4 Brake Oil Pressure Switch 

B1 

 

 

1

2

3

4

5

6

8

9

10

11

12

7

 

 

Terminal Assembly

Inhibitor Switch

Figure 31. Pin Assignment 

 

Figure 32. Location of Terminal Assembly 

 

CONSTRUCTION AND FUNCTION  7A1-19 

 

OIL PASSAGE 

 

 

 

 

 

Figure 33. Oil Passage of Transmission Case 

7A1-20  CONSTRUCTION AND FUNCTION 

 

 

Figure 34. Oil Passage of Oil Pump 

 

PARKING FUNCTION 

• By setting the select lever to the P position, the parking pawl is engaged with the parking gear and fixes 

the output shaft. 

• By moving the select lever, the manual shaft on the right side of the AT is moved.    The manual plate and 

parking rod in the AT are interlocked with the manual shaft.    When the manual shaft moves, the parking 
rod end pushes up the parking pawl. 

• The parking pawl is engaged with the parking gear when pushed up, and fixes the output shaft. 
• When the clutch is disengaged, it returns to the original position via the force of the return spring, fixed to 

the parking pawl. 

 

 

Figure 35. Parking Function