Isuzu N-Series. Service manual - part 1099

8-108 CAB AND CHASSIS ELECTRICAL

4HK1-TC Engine (4)

2

BLK

0.5BLK

3

WHT/

RED

0.5

BLU/

BLK

0.5

BLU/

BLK

0.5

BLU/

BLK

0.5

YEL/

BLU

0.5

YEL/

BLU

2

RED

2

RED

2

RED

ECM

J-191

1.25

RED

24

18

H-5

J-9

Frame

2

4

3

X-18

ECM Main

Relay

X-18

5

SBF-5

ECM

40A

F-28

ECM

10A

21

2

40

5

Battery voltage

Fuse &

Relay Box

(Glove Box)

F-9

ENG. (IG)

10A

Fuse &

Relay Box

(Behind the Cab)

Fuse &

Relay Box

(Behind the Cab)

Relay Box

(Instrument

Panel)

ECM main

relay control

Ignition voltage

USW JOINT

 3

Exhaust Brake Solenoid Valve

Starter Cut Relay

Intake Throttle Solenoid Valve

N6A6631E

SBF-2

KEY

40A

3

BLK/

YEL

1

2

ST

ON

ACC

OFF

B-67

3

B-67

Ignition

Switch

B-67

3

WHT/

BLU

3

WHT/

BLU

CAB AND CHASSIS ELECTRICAL 8-109

4HK1-TC Engine (5)

13

11

12

0.5

GRY

0.3

BLK/

WHT

0.3 BLK/WHT

0.3 BLK/WHT

HSA C/U

EHCU

(ABS Module)

TCM

HSA C/U

TCM

SRS C/U

0.3 LT BLU

0.3 LT BLU

0.3

WHT/

GRN

2

0.3

WHT/

BLK

0.5

LT BLU

1

52

38

0.5

YEL

0.5

YEL

7

0.5

LT BLU

0.5

BLK

Data

Link

Connector

(DLC)

ECM

Diagnostic

request

switch

Keyword

2000

0.5

BLK

1.25

BLK

1.25

BLK

4

Ground

5

B-79

Ground

20

H-4

4

1.25

BLK

3

1.25

BLK

1

0.75

BLK

62

0.75

BLK

43

0.5

BLK

81

J-191

9

B-1

Frame

2

BLK

J-9

Frame

Case

ground

3

1

2

USW

JOINT

 3

J/C-G

19

22

18

21

J/C-B

W/S-C

Signal

ground

Signal

ground

Power

ground

Power

ground

Power

ground

Diagnostic

request

(SRS)

Diagnostic

request

(ECM)

Diagnostic

request

(TCM or HSA)

Diagnostic

(EHCU)

Class 2

serial

communication

(EHCU)

Keyword

serial

communication

(ECM, TCM or

HSA & SRS)

N6A6632E

8-110 CAB AND CHASSIS ELECTRICAL

4HK1-TC Engine (6)

18

B-51

0.5

BLU/

RED

0.5

BLU/

RED

0.5

ORN/

BLU

0.5

BLU/

PNK

0.5

ORN/

BLU

0.5

BLU/

PNK

Parking

Brake

Switch

ECM

Engine

speed

signal

output

VSS

signal

MIL

control

Glow

indicator

lamp

control

Exhaust

brake

lamp

control

Parking

brake

switch

signal

12

H-5

13

5

0.3WHT/VIO

0.3

WHT/

VIO

0.3

WHT/

RED

0.3WHT/VIO

5

B-51

B-51

3

4

10

3

5

H-12

H-12

15

6

B-51

B-52

B-51

B-51

4

10

B-51

0.5BRN

0.5

BLK

0.5

BLK/YEL

0.5

BLK/

YEL

0.5

BLK/

YEL

0.5

BLK/

YEL

0.5 YEL/GRN

0.5

YEL/

GRN

0.5

YEL/

GRN

0.3

YEL/

GRN

0.3

L

T

 GRN

0.3

BLK/

YEL

0.5

BLK

0.5

BLK

1.25

BLK

0.3

WHT/BLK

0.3

WHT/BLK

WITH

HBB

W/O

HBB

Parking

Brake

Exhaust

Brake

Glow

MIL

M/T

M/T

Smoother

Smoother

0.5

WHT/

BLK

0.5

WHT/

BLK

0.5

WHT/

RED

0.3

WHT/

RED

0.5

WHT/BLK

0.5

WHT/BLU

Instrument

Panel

Cluster

(IPC)

Charge

Charge

Relay

Buzzer

Relay

Short

Connector

8

H-5

M/T

Smoother

HBB

Level

Switch

Diode Box

2

J-32

17

7

19

H-5

40

24

31

H-5

25

H-5

3

H-8

7

11

6

8

19

1

48

J-191

H-5

J-191

1

N-6

3

J-128

9

X-33

8

7

X-33

4

1

J-128

2

3

J-32

1

+B

B-1

Frame

F-16

METER

10A

Fuse &

Relay Box

(Glove Box)

T

achometer

Speedometer

0.3

L

T

 GRN

8

B-52

HSA

 C/U

Engine coolant

temperature gauge

7

H-14

23

H-5

4

B-55

0.5 

L

T

 BLU

0.5 

L

T

 BLU

0.5 

L

T

 BLU

0.5

GRN/

YEL

0.5

BLK

ECM

2

E-90

1

E-90

3

W/S-C

W/S-M

12

14

13

J/C-B

J-9

Frame

N6A6633E

ECM

VSS

ECT

Sensor

CAB AND CHASSIS ELECTRICAL 8-111

4HK1-TC Engine (7)

ECM

0.5

RED

0.5

BLU

0.5

BLU/

WHT

0.5RED

0.5WHT

0.5

WHT

0.5

RED

0.5

WHT

0.5

BLU/

RED

0.5

PNK/

BLK

0.3

BLK

0.5BLK

0.5

BLK

0.5

BLK

61

64

14

4

13

12

42

63

3

10

11

1

H-4

H-4

60

39

41

20

J-191

B-280

APP

sensor 1

signal

APP

sensor 2

signal

Low reference

Low reference

Shield ground

Shield ground

5V reference 2

ECM

5

B-280

5V reference 1

3

1

APP

Sensor 2

2

6

4

APP

Sensor 1

N6A6657E

J-191

0.5

RED

0.5

BRN

0.5

BLU

0.5

BLU/

YEL

0.5

RED

0.5

PNK/

BLK

0.5

BLU/

RED

0.5

PNK/

BLK

70

66

3

1

1

3

Idle

Up

Sensor

2

2

1

3

PT

O

Throttle

Sensor

2

J-166

B-281

H-4

J-166

B-281

H-4

PT

O

throttle

sensor

signal

Idle up

sensor

signal

0.5

PNK/

BLK

BARO

Sensor

IA

T

Sensor

BARO

Sensor

IA

T

Sensor

0.5

BLK