Isuzu KB P190. Service 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