Isuzu KB P190. Manual - part 1065

CONSTRUCTION AND FUNCTION  7A1-21 

INHIBITOR SWITCH 

• The inhibitor switch is installed on the right side of the transmission main unit to detect the select lever 

position. 

• The inhibitor switch is connected with the starter SW circuit.  The engine cannot be started when the 

select lever is at any position other than the P and N position. 

• By moving the select lever, the combination of the inhibitor switch pins is changed.  The current position of 

TCM is detected based on the combination of the pins. 

 

 

10 7 3 2 4 8 5 1 9 6 

P 

 

 

 

 

 

 

 

 

 

 

R 

 

 

 

 

 

 

 

 

 

 

N 

 

 

 

 

 

 

 

 

 

 

D 

 

 

 

 

 

 

 

 

 

 

3 

 

 

 

 

 

 

 

 

 

 

2 

 

 

 

 

 

 

 

 

 

 

L 

 

 

 

 

 

 

 

 

 

 

 

 
 
 
 

6

3

4

5

10

9

8

7

2

1

 

 

 

 

Terminal Assembly

Inhibitor Switch

 

Figure 36. Pin Assignment 

 

Figure 37. Location of Inhibitor Switch 

 

7A1-22  CONSTRUCTION AND FUNCTION 

TURBINE SENSOR 

•

 The turbine sensor is a hall element.  It is installed to the front of the transmission case.  The turbine 

sensor converts the rotations of the reverse & high clutch drum fitted with the input shaft by spline to 
pulse signal and sends the signal to the TCM. 

•

 One turn of the reverse & high clutch drum generates 32-pulse signals, which are sent to the TCM. 

 
 

 

 

Figure 38. Turbine Sensor 

 

 

 

SPEED SENSOR 

•

 The speed sensor is a hall element.  It is installed to the rear of the transmission case.  The speed sensor 

converts the rotations of the parking gear, fitted with the output shaft by spline, to a pulse signal and 
sends the signal to the TCM. 

•

 One turn of the parking gear generates 16-pulse signals, which are sent to the TCM. 

 

 

 

 

Figure 39. Speed Sensor 

 

Figure 40. Location of Turbine & Speed Sensor 

 
 

CONSTRUCTION AND FUNCTION  7A1-23 

ACCELERATOR PEDAL POSITION SENSOR  

•

 Opening of the accelerator pedal is converted to an electric signal which is transmitted from ECM to TCM. 

•

 The accelerator pedal position sensor (1) is installed to the accelerator pedal. 

 

 

 

 

 

 

 

Pin 

No.

Wire Color

Pin Function 

1

BLU 

APP Sensor 3 +5V Reference 

2

 Not 

Used 

3

ORN/BLU 

APP Sensor 2 Low Reference

4

BLK 

APP Sensor 1 Low Reference

5

RED 

APP Sensor 1 Signal 

6

BLU/WHT 

APP Sensor 3 Signal 

7

BLU/RED 

APP Sensor 3 Low Reference

8

ORN 

APP Sensor 2 +5V Reference 

9

BLU/GRN 

APP Sensor 2 Signal 

10

WHT 

APP Sensor 1 +5V Reference 

 

RTW77ASH000501

Figure 41. Accelerator Pedal Position Sensor 

 

Figure 42. Pin Assignment 

 

ENGINE SPEED SENSOR (=CKP SENSOR) 

•

 The engine speed sensor converts the crankshaft from the Crankshaft Position (CKP) sensor rotation to a 

pulse signal which is transmitted from ECM to TCM. 

 

 
 
 

 

 

 

 

 

 

Pin 

No.

Wire Color

Pin Function 

1

YEL Sensor 

Signal 

2

BLU 

Sensor Low Reference 

3

GRN 

Sensor +5V Feed 

 

Figure 43. Crankshaft Position (CKP) Sensor 

 

Figure 44. Pin Assignment 

 
 

7A1-24  CONSTRUCTION AND FUNCTION 

BRAKE SWITCH 

•

 The brake switch (1) is installed to the brake pedal (2).  When the driver steps on the brake pedal, an 

electric signal is sent to the TCM. 

 

 

 

 

 

 
 
 

TCM A3 

+12V 

RTW77ASH000601

Figure 45. Brake Switch 

 

Figure 46. Pin Assignment 

 

 

MODE SELECT SWITCH 

•

 The mode select switch (2) is installed beside the select lever (1).  When the driver selects the PWR or 

3rd, an electric signal is sent.  It turns ON the indicator lamp in the meter. 

•

 The 3rd START mode can only be used in the D position. 

 

 

 

 

 

 
 
 
 
 
 
 
 

 

Power 3rd 

Illumination 

Lamp 

1 (Illumination) 

 

 

 

2 (Ground) 

 

 

 

3 (TCM A24) 

 

 

 

4 (No Connection) 

 

 

 

5 (TCM A11) 

 

 

 

6 (Ground) 

 

 

 

 

2

1 

6

5 

4 

3 

RTW77ASH000701

Figure 47. Mode Select Switch 

 

Figure 48. Pin Assignment