Isuzu N-Series. Service manual - part 646

6E-6    Engine Control System (4HK1) 

Charging System

F-16

METER

10A

SBF-8

ST

AR

TER

60A

SBF-3

GLOW

60A

SBF-1

MAIN

100A

 or 120A

18

10

B-51

B-51

0.5

BLK/

YEL

0.5

BLK/

YEL

0.5

WHT/

BLU

0.5

WHT/

BLU

0.5

WHT/

BLU

8

WHT/

BLK

0.5

BLK/

YEL

0.5

WHT/

RED

0.85

WHT/

RED

Charge

Relay

Glow Relay

8BLK

30BLK/RED

2L

B

Starter Relay

Charge

BS

2

1

1

J-1

J-2

J-1

15

H-5

L

ACG

J-26

Starter

P-1

P-2

P-3

P-4

P-5

0.85

WHT/

BLU

1.25

WHT/

BLU

3

WHT/

BLU

3

BLK/

YEL

3

WHT/

BLU

3

WHT/

BLU

Heater

& A/C 

Relay

Fuse & Relay Box

Fuse &

Relay Box

(Behind the Cab)

Fuse &

Relay Box

(Behind the Cab)

Instrument

Panel

Cluster

(IPC)

Fuse &

Relay Box

(Glove Box)

Fuse &

Relay Box

(Glove Box)

1

5

4

X-1

X-1

3

2

13

W/S-M

J/C-I

0.5

BLK/

YEL

N6A6630E

Battery

2

ST

ON

ACC

OFF

B-67

3

B-67

Ignition

Switch

1

H-7

SBF-2

KEY

40A

 Engine Control System (4HK1)    6E-7

ECM Power

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

6E-8    Engine Control System (4HK1) 

ECM Grounding and DLC

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

 Engine Control System (4HK1)    6E-9

Warning Lamps and Gauges

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