Hyundai Santa Fe (2006 year). Manual - part 495

FLA -46

FUEL SYSTEM

KNOCK SENSOR (KS)

INSPECTION

EC4B1DA6

FUNCTION AND OPERATION PRICIPLE

Knocking is a phenomenon characterized by undesirable
vibration and noise and can cause engine damage. Knock
Sensor (KS) senses engine knocking and the two sensors
are installed inside the V-valley of the cylinder block. When
knocking occurs, the vibration from the cylinder block is
applied as pressure to the piezoelectric element. At this
time, this sensor transfers the voltage signal higher than
the specified value to the PCM and the PCM retards the
ignition timing. If the knocking disappears after retarding
the ignition timing, the PCM will advance the ignition tim-
ing. This sequential control can improve engine power,
torque and fuel economy.

Sensor

Connector

EGRF251A

Housing

Connector

Nut

Spring Washer

Load Washer

Insulator

Terminal

Piezo-electricity element

Insulator

Sleeve

EGRF252A

SPECIFICATION

Item

Specification

Capacitance (pF)

950 ~ 1,350pF

GASOLINE ENGINE CONTROL SYSTEM

FLA -47

WAVEFORM

The knock sensor is installed at cycliner block to detect the vibration effectively during engine running. 
The above waveform shows the signal waveform of knock sensor when knock dosen't happen. Generally, knock signal 
has more noise than other sensor.    

EGRF610B

CIRCUIT DIAGRAM

KS  [Bank1] 

PCM

C88-1

C30-B

PCM (C30-B)

KS  [Bank1] 

1

2

KS  [Bank2] 

1

2

KS  [Bank2] 

C88-2

1

21

2

22

3

23

4

24

5

25

6

26

7

27

8

28

9

29

10

30

11

31

12

32

13

33

14

34

15

35

16

36

17

37

18

38

19

39

20

40

41

61

42

62

43

63

44

64

45

65

46

66

47

67

48

68

49

69

50

70

51

71

52

72

53

73

54

74

55

75

56

76

57

77

58

78

59

79

60

80

PCM C30-B (56)

KS #1 [High] signal

3

PCM C30-B (23)

Shield ground

KS #1 [Low] signal

PCM C30-B (53)

KS #2 [High] signal

3

PCM C30-B (23)

Shield ground

PCM C30-B (54)

PCM C30-B (55)

KS #2 [Low] signal

Knock Sensor(KS) [Bank1] (C88-1)

2

56 - KS #1 [High]

55 - KS #1 [Low]

1

Knock Sensor(KS)  [Bank2] (C88-2)

1

3

3

54 - KS #2 [Low]

53 - KS #2 [High]

23 - Sensor Shield

2

[CIRCUIT DIAGRAM]

[HARNESS CONNECTORS]

[CONNECTION INFORMATION]

Terminal

Connected to

Function

Terminal

Connected to

Function

1

2

3

1

2

3

SCMF16112L

FLA -48

FUEL SYSTEM

INJECTOR

INSPECTION

EBCA1EAE

FUNCTION AND OPERATION PRICIPLE

Based on information from various sensors, the PCM mea-
sures the fuel injection amount. The fuel injector is a sole-
noid-operated valve and the fuel injection amount is con-
trolled by length of time that the fuel injector is held open.
The PCM controls each injector by grounding the control
circuit. When the PCM energizes the injector by grounding
the control circuit, the circuit voltage should be low (the-
oretically 0V) and the fuel is injected. When the PCM
de-energizes the injector by opening control circuit, the
fuel injector is closed and circuit voltage should momen-
tarily peak.

CAUTION

If an injector connector is disconnected for more
than 46 seconds while the engine runs, the PCM
will determine that the cylinder is misfiring and
cut fuel supply. So be careful not to exceed 46
seconds. But the engine runs normally in 10 sec-
onds after turning the ignition key off.

KFCF1026

SPECIFICATION

Item

Specification

Coil Resistance (Ω )

13.8 ~ 15.2Ω at 20℃

(68℉)

GASOLINE ENGINE CONTROL SYSTEM

FLA -49

CIRCUIT DIAGRAM

PCM

C30-A

72 - Injector #1

PCM (C30-A)

Injector #1

Injector #1

(C37-1)

Injector #2

(C37-2)

Main Relay

2

1

63 - Injector #2

Main Relay

2

1

1

2

Injector #1,3,5

Injector #2,4,6

1

21

2

22

3

23

4

24

5

25

6

26

7

27

8

28

9

29

10

30

11

31

12

32

13

33

14

34

15

35

16

36

17

37

18

38

19

39

20

40

41

61

42

62

43

63

44

64

45

65

46

66

47

67

48

68

49

69

50

70

51

71

52

72

53

73

54

74

55

75

56

76

57

77

58

78

59

79

60

80

Main Relay

Battery Voltage (B+)

PCM C30-A (72)

Injector #1 control

Injector #2

1

2

Main Relay

Battery Voltage (B+)

Injector #3

1

2

Main Relay

Battery Voltage (B+)

PCM C30-A (64)

Injector #3 control

Injector #4

1

2

Main Relay

Battery Voltage (B+)

PCM C30-A (68)

Injector #4 control

Injector #5

1

2

Main Relay

Battery Voltage (B+)

PCM C30-A (69)

Injector #5 control

Injector #6

1

2

Main Relay

Battery Voltage (B+)

PCM C30-A (71)

Injector #6 control

64 - Injector #3

Injector #3

(C37-3)

Injector #4

(C37-4)

Main Relay

2

1

68 - Injector #4

Main Relay

2

1

69 - Injector #5

Injector #5

(C37-5)

Injector #6

(C37-6)

Main Relay

2

1

71 - Injector #6

Main Relay

2

1

[CIRCUIT DIAGRAM]

[HARNESS CONNECTORS]

[CONNECTION INFORMATION]

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

1

2

PCM C30-A (63)

Injector #2 control

C37-1,3,5

C37-2,4,6

SCMF16113L

COMPONENT INSPECTION

1.

Turn ignition switch OFF.

2.

Disconnect injector connector.

3.

Measure resistance between injector terminals 1 and
2.