Hyundai: Engine D4FA. Manual - part 152

DIESEL CONTROL SYSTEM

FLA -479

DTC DETECTING CONDITION

E961B743

Item

Detecting Condition

Possible Cause

DTC Strategy

• Voltage monitoring

Enable Conditions

• Engine running

ThresholdValue

• Short to GND in Lambda sensor circuit
• Open in Lambda sensor circuit

DiagnosticTime

• 2.0 sec.

Fuel Cut

NO

EGR Off

NO

Fuel Limit

NO

Fail Safe

MIL

NO

• Lambda sensor circuit
• Lambda sensor component

SPECIFICATION

EAC9D850

rich gas mixture of synthetic gas
9%CO, 7%H

2

, 7%CO

2

 in Nz

lean gas : O2 in N2

 = (X

02

/3 1) / (1-4.76

*

 

X

O2

)

for H/C = 2

1.500

1.000

0.500

0.000

-0.500

-1.000

-1.500

-2.000

Ip meas/mA

EGNG009D

λ value

0.65

0.70

0.80

0.90

1.01

1.18

1.43

1.70

2.42

Air

Pump-

ing cur-

rent

-2.22

-1.82

-1.11

-0.50

0.00

0.33

0.67

0.94

1.38

2.54

FLA -480

FUEL SYSTEM

SCHEMATIC DIAGRAM

E109AFD4

C141 Lambda sensor

1

1

2

3

4

6

5

2

C101-2 terminal 64

Sensor power

Main relay power

10A SNSR FUSE

3

Sensor ground

C101-2 terminal 86

4

Sensor signal

C101-2 terminal 87

5

Sensor heater

C101-2 terminal 51

6

Sensor pump

C101-2 terminal 65

64. Sensor power

86. Sensor ground

87. Sensor signal

65. Sensor pump

51. Sensor heater

10A SNSR FUSE (Main relay power)

C01-2 ECM

C141 Lambda sensor

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

1

2

3

4

5

6

[CIRCUIT DIAGRAM]

[HARNESS CONNECTOR]

[CONNECTOR INFORMATION]

Terminal

Terminal

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

EGNG009E

DIESEL CONTROL SYSTEM

FLA -481

SIGNAL WAVEFORM AND DATA

E424DC09

Fig.1

Fig.2

Fig.3

Fig.4

Fig.1) Waveform of Lambda sensor power(terminal 1) at IG KEY "ON" and Engine running. It fluctuates between 1V and 3V 
          periodically.
Fig.2) Waveform of Lambda sensor ground(terminal 3) at IG KEY "ON" and Engine running. 2.5V is displayed.
Fig.3) Waveform of Lambda sensor signal(terminal 4) at IG KEY "ON" and Engine running. 850mV is displayed.
(same value at idle and acceleration)
Fig.4) Waveform of Lambda sensor pump(terminal 6) at IG KEY "ON" and Engine running. 850mV is displayed.
(same value at idle and acceleration)

EGNG009F

TERMINAL AND CONNECTOR INSPECTION

E35B5F56

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. )

FLA -482

FUEL SYSTEM

3.

Is the problem found?

YES

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

NO

▶ Go to "Power Circuit Inspection".

POWER CIRCUIT INSPECTION

EC40DF80

1.

Check voltage ＆ waveform in sensor power circuit

1)

IG KEY "OFF", ENGINE "OFF".

2)

Disconnect Lambda sensor connector.

3)

IG KEY "ON".

4)

Measure the voltage of Lambda sensor connector terminal 1.

5)

Monitor the waveform in Lambda sensor connector terminal 1.

Specification : Measured voltage : 2.0 V
waveform : Refer to "Signal Waveform ＆ Data" of "General Information". The waveform similar to Fig.1) is displayed.

6)

Is the measured voltage within the specification?

YES

▶ Go to "Signal Circuit Inspection".

NO

▶ No voltage detected in Lambda sensor power circuit : Go to "2. Check open in sensor power circuit" as follows.
▶ High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor power circuit
and go to "Verification of Vehicle Repair".

2.

Check open in Lambda sensor power circuit

1)

IG KEY "OFF", ENGINE "OFF".

2)

Disconnect Lambda sensor connector and ECM connector.

3)

Check continuity between Lambda sensor connector terminal 1 and ECM connector terminal 64.

Specification : Continuity(below 1.0Ω )

4)

Is the measured voltage within the specification?

YES

▶ Repair short to ground in Lambda sensor power circuit and go to "Verification of Vehicle Repair".

NO

▶ Reapir open in Lambda sensor power circuit and go to "Verification of Vehicle Repair".