Hyundai: Engine D4FA. Manual - part 96

DIESEL CONTROL SYSTEM

FLA -255

DTC P0340 CAMSHAFT POSITION SENSOR A CIRCUIT MALFUNCTION
(BANK 1 OR SINGLE SENSOR)

COMPONENT LOCATION

E617D2D3

CKPS

CMPS

EGNG005I

GENERAL DESCRIPTION

EE657C80

Cam Shaft Position Sensor(CMPS) is hall sensor type. Sensing the teeth attatch at the end of exhaust cam shaft, CMPS
detects rotation of Cam shaft (1 signal per 1 lotation)As Cam shaft rotates once while Crank shaft does twice, CMPS
referrence point generates once while CKPS’ do twice.As this signal inputted to ECM, it distinguishes crank angle and the
cylinder which requires fuel injection in order to determine injection sequence and duration.

DTC DESCRIPTION

E41B283B

P0340 is set when CKPS signal is outputted while CMPS signal does not generate for more than 0.7 sec.. This code is
due to the failure relevant to CMPS related circuit and sensor component.

DTC DETECTING CONDITION

E7865094

Item

Detecting Condition

Possible Cause

DTC Strategy

• Signal monitoring

Enable Conditions

• Engine running(during accelerating)

ThresholdValue

• CKPS signal is outputted while CMPS signal

does not generate.

DiagnosticTime

• 700ms

Fuel Cut

NO

EGR Off

NO

Fuel Limit

YES

Fail Safe

MIL

YES

Engine does not turn "ON"
at starting.

• CMPS circuit
• CMPS component

FLA -256

FUEL SYSTEM

SPECIFICATION

ECCF378D

Sensor Type

Output Signal
Characteristic

Air Gab

LOW Signal

Detecting Voltage

HIGH Signal

Detecting Voltage

Hall effect type

0V~5V Digital signal

output

1.25mm

below 2.0V

above 3.8V

SCHEMATIC DIAGRAM

E2482EDE

1

1

2

2

3

3

C142 J/C terminal 9

Sensor signal

 Sensor power

Sensor ground

C101-1 terminal 50

C101-1 terminal 20

50. Sensor signal

15A INJ FUSE (Main relay power)

20. Sensor ground

C101-1 ECM

C105 CMPS

H

C105 CMPS

1

2

3

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

[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

EGNG005J

DIESEL CONTROL SYSTEM

FLA -257

SIGNAL WAVEFORM AND DATA

E8E228EE

Fig.1

Fig.2

Fig.1) This shows waveform of Crank Shaft Position Sensor and Cam Shaft Position Sensor simulatneously. 
         The middle area indicates reference points of Crank Shaft Position Sensor and Cam Shaft Position Sensor. 

Fig.2) Crank Shaft Position Sensor and Cam Shaft Position Sensor signal are measured simultaneously.  
          Cam Shaft Position Sensor  signal is outputted once when Crank Shaft Position sensor signal is outputted twice. 
          LOW and HIGH output of Cam Shaft Position sensor reference point is detected at Crank Shaft Position sensor reference 
          point.
         ( Injection sequence is determined based on LOW and HIGH signal of Cam Shaft Position Sensor reference point as 
           detecting cylinder position.)

EGNG005K

※ SIGNAL ANALYSIS

5.0V

3.8V

2.0V

0.0V

Falling edge

Vo

Rising edge

High-signal detecting range

Hysteresis range

Low-signal detecting range

T

EGNG005L

1.

ECM recognizes HIGH signal as LOW signal when CMPS signal drops below 2.0V and LOW signal as HIGH signal
when CMPS signal rises above 3.8V.

2.

V0 - the Minimum voltage of LOW signal does not drop below 0.0V due to the hall sensor inside resistance. When
the Minimum voltage of LOW signal is above 0.6V during signal waveform inspection, check excessive resistance
inside of CMPS component or in ground circuit.

MONITOR SCANTOOL DATA

E72206B9

1.

Connect Scantool to Data Link Connector (DLC).

2.

Warm engine up to normal operating temperature.

3.

Turn "OFF" electrical devices and A/C.

FLA -258

FUEL SYSTEM

4.

Monitor "ENGINE SPEED SENSOR" parameter on the Scantool.

Specification : 800±50RPM at idle

Fig.1) Check "ENGINE SPEED SENSOR" parameter carefully after warming engine up, also check engine stall and rpm instability 
          or engine shut down.

Fig.1

EGNG005M

TERMINAL AND CONNECTOR INSPECTION

EC09A43F

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 or
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 "Power Circuit Inspection".

POWER CIRCUIT INSPECTION

E0635D22

1.

IG KEY "OFF", ENGINE "OFF".

2.

Disconnect CMPS connector.

3.

IG KEY "ON".