Hyundai: Engine D4FA. Manual - part 160

DIESEL CONTROL SYSTEM

FLA -511

DTC U0001 CAN COMMUNICATION MALFUNCTION

COMPONENT LOCATION

EB9C381B

ECM

EGNG014G

GENERAL DESCRIPTION

E6EC6484

Several control units are applied to electronically controlled vehicles. These units perform each control with informations
from various sensors. Thus, sharing signal information from sensors is needed, so CAN communication type whose com-
munication speed is high and insensitive to electrical noise by spark generation is adopted to controlling power-train(en-
gine, atutomatic transaxle, ABS, TCS, ECS)As sharing signals of engine speed, APS, engaged gear and torque reduction
through CAN communication, ECM and TCM modules control vehicle actively.

CAN 2.0 B communication format

NO. in box

means 

scale

STANDARD ID

EXTENDED 

ID

EGNG014H

DTC DESCRIPTION

EBAB6371

U0001 is set when signal transmission through CAN communication line is impossible for more than 0.1 sec. because of
open or short to ground in CAN communication line. Checking CAN communication BUS and signals from ECM, TCM
module is required.

FLA -512

FUEL SYSTEM

DTC DETECTING CONDITION

E5460F8E

Item

Detecting Condition

Possible Cause

DTC Strategy

• Signal monitoring

Enable Conditions

• IG KEY "ON"

ThresholdValue

• CAN BUS error

DiagnosticTime

• 100ms

Fuel Cut

NO

EGR Off

NO

Fuel Limit

NO

Fail Safe

MIL

NO

• CAN BUS
• CAN communication module

component

SPECIFICATION

E49E97B9

DIGITAL "0"

DIGITAL "1"( BUS IDLE )

CAN Communication Line

Resistance

Communica-

tion Format

HIGH

LOW

HIGH

LOW

Inside of ECM

Inside of

In-pannel

junction box

CAN 2.0B

3.5V

1.5V

2.5V

2.5V

120Ω (20℃)

120Ω (20℃)

DIESEL CONTROL SYSTEM

FLA -513

SCHEMATIC DIAGRAM

E3150397

84

83

I/P-E terminal 17

E16 terminal 9

E152 terminal 38

M33 terminal 3

I/P-E terminal 18

E16 terminal 17

E152 terminal 36

M33 terminal 11

CAN HIGH

CAN LOW

E16 Multipurpose 
Check Connector

M33 Data Link Connector

CAN HIGH

CAN LOW

C101-2 ECM

I/P JUNTION BOX

CAN HIGH 9

CAN LOW 17

E152 TCM

CAN vertical

resistance (120 )

CAN vertical

resistance (120 )

3 CAN HIGH

11 CAN LOW

17

9

84

83

I/P-E

I/P-N

18

18

CAN HIGH 38

CAN LOW 36

M33 Data Link Connector

E16 Multipurpose Check Connector

E152 TCM

4

6

* *

*

11

9

2

3

5

1

12

13

*

*

*

5

*

*

*

9

*

*

*

*

*

*

12

*

*

*

*

17

18

19

*

C101-2 ECM

C101-1 ECM

1

30 29

31

32

38

39

36

37

35

33

34

40

42 41

46 45 44 43

48 47

50 49

2

3

4

6

5

8

7

12 11 10 9

13

14

15

18 17

19

16

22

25

27 26

23

20

21

24

28

51

75 74
53 52

73

79 78 77 76

80

81

83 82

84

86 85

87

89 88

90

92 91

93

94

57

69 68

70

71

64

54

55

56

61

58

59

60

63 62

65

66

67

72

4

5

24

23

21 22

20

19

62

61

59

58

78

74

53

52

44

17 18

38

36 37

14

12

10

9

8

7

6

1

2

3

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

* *

*

* *

* *

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

[CIRCUIT DIAGRAM]

[HARNESS CONNECTOR]

[CONNECTOR INFORMATION]

Terminal

Terminal

Connected to

Connected to

Function

1

2

4

3

6

5

8 7

12

13

16

17

18

23 22

20

21

19

27 26 25 24

28

29

30

14

9

10

11

15

33 32 31

34

37

41

42

40 39 38

35

36

43

44

47 46

49 48

50

53

56

58 57

54

51

52

55

59

60
45

EGNG014I

FLA -514

FUEL SYSTEM

SIGNAL WAVEFORM AND DATA

EE8CCCD8

Fig.1

Fig.1) CAN communication waveform

Monitoring CAN HIGH and LOW simultaneously is important in monitoring CAN communication waveform. When CAN HIGH 
signal rise to 3.5V and LOW signal drops to 1.5V - voltage difference between HIGH and LOW signal is 2V - at BUS IDLE state
(DIGITAL "1") whose reference voltage is 2.5V, "0" is recognized. Besides, comparing HIGH and LOW signal if opposite waveform 
is detected with the reference voltage of 2.5V, Check if current cam signal transfers correctly.
 Continuous "0"signal above 6BIT means the occurence of error in CAN communication. 
1BIT is easily distinguished as calculating the time when "SOF"(START OF FRAME) which notifies the start of frame occurs. 
Check if "0"signal above 6BIT is detected continuously when monitoring CAN communication waveform.

CAN HIGH signal

CAN LOW signal

SOF Bit

Digital "0"

Digital "1"

BUS IDLE

EGNG014J

TERMINAL AND CONNECTOR INSPECTION

E57F8AD7

1.

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various prob-
lems and damge of component.

2.

Perform checking procedure as follows.

1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

2)

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking
device and connecting condition between terminal and wiring.

NOTE

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for
checking connecting condition. ( after checking, reconnect the pin at correct position. )

3.

Is the problem found?

YES

▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".

NO

▶ Go to "Signal Circuit Inspection".