Isuzu N-Series. Service manual - part 739

 Engine Control System (4JH1)    6E-7

Starting and Charging System

Refer to

Power Distribution

Refer to

Power Distribution

SBF-2

KEY

50A

30

BLK

3

BLK/

WHT

3

WHT/

BLK

3

WHT/

BLK

E-72

P-6

J-26

3

BLK/

WHT

SBF-8

ST

AR

TER

60A

3

WHT/

BLU

3

WHT/

BLU

P-1

P-2

P-3

P-2

P-5

P-4

Battery

J-9

Frame

2

BLK

0.5

BLK

Starter

Relay

F-22

ST

AR

TER

10A

4

B-67

14

H-8

2

B-67

1

H-7

30BLK

8BLK

2L

Fuse & Relay Box

(Behind the Cab)

Fuse &

Relay Box

(Glove Box)

3

13

H-3

2

P-8

1

P-8

P-9

3

WHT

0.85

WHT/BLU

0.85

WHT/BLU

0.5

WHT/BLU

8

WHT

H-6

SB

Generator

L

ST

ON

ACC

OFF

Ignition

switch

Relay Box

(Instrument

 Panel)

5

3

4

X-8

X-8

2

0.5

BLK/

YEL

0.5

BLK/

YEL

4

2

5

3

X-1

1

X-1

1

Charge

Relay

Fuse &

Relay Box

(Glove Box)

F-16

METER

10A

Heater

A/C Relay

W/S-M

Relay Box

(Instrument

 Panel)

Starter

B

C

1

J-27

1

M

N6A3864E

6E-8    Engine Control System (4JH1) 

ECM Power and PCU

CAN

high

CAN

low

ESO

solenoid

signal

output

12V

Battery

voltage

ECM

main

relay

control

3

BLU/

RED

3

BLU/

RED

0.5

BLU/

BLK

2

BLU/

RED

58

3

B-233

ECM

1

H-6

15

H-14

7

E-1

10

10

5

6

11

100

99

1

2

CAN

high

CAN

low

BA

T

 (+)

16

6

2

BLK

2

BLK

0.5

RED

0.5

YEL

0.5

BLU

0.5

YEL

12

7

13

8

105

91

8

H-8

H-14

E-1

10

5

ESO

solenoid

signal

CKP

sensor

signal

J-9

Frame

PCU

CKP

sensor

signal

output

Exhaust Brake

 Solenoid V

alve

Intake Throttle

 Solenoid V

alve

Neutral Switch

A/C Compressor Relay

A/C Signal Relay

MAF & IA

T

 Sensor

Glow Relay

1.25

BLK/

YEL

3

BLK/

YEL

3

BLK/

YEL

ECM

Main

Relay

F-8

ENG.(B1)

15A

Fuse &

Relay Box

(Glove Box)

Relay Box

(Instrument

 Panel)

4

5

2

X-14

X-14

1

2BLU/RED

2

RED/

WHT

0.5

PNK

0.5

PNK

0.5

PNK

0.5

ORN

0.5

ORN

0.5

ORN

0.5

BLU

0.5

YEL

F-16

METER

10A

0.5

BLK/

YEL

Meter

39

B-234

Ignition voltage

W/S-M

2

BLU/

RED

F-9

ENG.(B2)

15A

N6A3866E

 Engine Control System (4JH1)    6E-9

ECM Grounding, EHCU and DLC

Ground

Ground

2

BLK

3

BLK/

YEL

2

WHT/

BLK

2

WHT/

BLK

0.5

BLK/

YEL

2

BLK

5

BLK

0.5

BLU

0.5

YEL

F-8

ENG.(B1)

15A

ECM

Data

Link

Connector

(DLC)

45

1

B+

2

35

B-234

Keyword

2000

Diagnostic

request

switch

Keyword

2000

6

16

7

B-79

5

5

9

4

B-79

B-7

Headlight Bracket

0.5

BLK

0.5

BLK

0.85

BLK

0.85

BLK

Ground

Ground

EHCU

4

29

J-177

2

12

4

3

H-15

26

27

H-5

0.3

WHT/

BLK

0.3

WHT/

BLK

0.3

WHT/

BLK

0.3

WHT/

GRN

0.3

WHT/

GRN

0.3

WHT/

GRN

J1850

(Class2)

Diagnostic

request

switch

F-9

ENG.(B2)

15A

W/S-C

J/C-E

Fuse & Relay Box

(Glove Box)

Diagnostic

request

switch

Diagnostic

request

switch

B-1

Frame

ECM

Main

Relay

J1850

(Class2)

N6A3867E

6E-10    Engine Control System (4JH1) 

Gauges and Warning Lamps

12V

VSS

signal

Exhaust

brake

lamp

control

Glow

indicator

lamp

control

MIL

control

42

43

B-234

68

27

ECM

Instrument

Panel Cluster

(IPC)

MIL

Glow

3

1

J-32

VSS

Engine

speed

signal

output

4

B-51

6

8

0.5

GRN/

YEL

0.5

ORN/

BLU

0.5

BLU/

GRN

0.85

BLK

0.5

YEL/

GRN

0.5

BLK

0.85

BLK

2

BLK

0.5

YEL/

GRN

T

achometer

1

B-55

8

2

J-32

10

Speedometer

0.5

BLK/YEL

F-16

METER

10A

19

H-5

25

31

B-7

Headlight

Bracket

1

B-51

0.5

L

T

 GRN/

BLU

Exhaust

Brake

Exhaust

Brake

Switch

60

0.5

GRN/

RED

2

B-52

3

0.5

BLK

0.85

BLK

9

B-1

Frame

0.3

BLK

Fuse & Relay Box

(Glove Box)

0.3

BLK/

YEL

0.3

BLK/

YEL

0.5

YEL/

GRN

N6A3868E