Hyundai Santa Fe (2006 year). Manual - part 511

FLA -110

FUEL SYSTEM

DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 / SENSOR 1)

COMPONENT LOCATION

ECC4F0DF

HO2S [Bank 1/Sensor 1]

LGLG504A

GENERAL DESCRIPTION

E7D9053E

The normal operating temperature of the HO2S(Heated Oxygen Sensor) ranges from 350 to 850 C(662 to 1562 F). The
HO2S heater greatly decreases the amount of time required for fuel control to become active. The ECM provides a pulse
width modulated control circuit to adjust current through the heater. When the HO2S is cold, the value of the resistance is
low and the current in the circuit is high. On the contrary, if the temperature in the resistor of the sensor rises, the current
drops gradually.

DTC DESCRIPTION

E55501AD

Checking current from HO2S under detecting condition,if the heater current is below a certain threshold for more than
predeterminate time, PCM sets P0030. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consec-
utive 2 driving cycle.

DTC DETECTING CONDITION

E1805512

Item

Detecting Condition

Possible cause

DTC Strategy

• Monitor the current through the heater

Enable Conditions

• Engine Running ＞ 60 sec.
• Heater Duty Cycle ＞ 40%
• Max. Duty Cycle - Min. Duty Cycle ＜ 5%

Threshold value

• Filtered Heater Current ＜ threshold value

Diagnosis Time

• Continuous

(More than 2.5 second failure for every 5 second test )

MIL On Condition

• 2 Driving Cycles

• Poor Connection
• Contact Resistance
• HO2S(B1/S1)
• PCM

DTC TROUBLESHOOTING PROCEDURES

FLA -111

SPECIFICATION

E50E2A42

(REFERENCE ONLY)

Condition

Current(A)

Heater Current at 13.5V, 450℃(842 F) Exhaust

0.52 ± 0.1

SCHEMATIC DIAGRAM

ECB89579

HO2S [Bank 1/Sensor 1]
HO2S [Bank 2/Sensor 1]

PCM

C91-1,2

C30-B

PCM (C30-B)

HO2S [B1/S1] (C91-1)

1

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

Battery Voltage (B+)

Main Relay

3

4

PCM C30-B (30)

HO2S [B1/S1] Signal

Sensor ground

PCM C30-B (49)

Main Relay

3

4

1

2

49 - HO2S [B1/S1] Signal

30 - GND

70 - Heater [B1/S1] Control

HO2S [B2/S1] (C91-2)

Main Relay

3

4

1

2

51 - HO2S [B2/S1] Signal

28 - GND

67 - Heater [B2/S1] Control

HO2S [B1/S2] (C91-3)

Main Relay

3

4

1

2

50 - HO2S [B1/S2] Signal

31 - GND

74 - Heater [B1/S2] Control

HO2S [B2/S2] (C91-4)

Main Relay

3

4

1

2

52 - HO2S [B2/S2] Signal

29 - GND

73 - Heater [B2/S2] Control

1

2

3

4

PCM C30-B (28)

HO2S [B2/S1] Signal

Sensor ground

PCM C30-B (51)

Battery Voltage (B+)

Main Relay

PCM C30-B (67)

Heater

 [B2/S1] Control

1

2

3

4

PCM C30-B (31)

HO2S [B1/S2] Signal

Sensor ground

PCM C30-B (50)

Battery Voltage (B+)

Main Relay

PCM C30-B (74)

Heater

 [B1/S2] Control

1

2

3

4

PCM C30-B (29)

HO2S [B2/S2] Signal

Sensor ground

PCM C30-B (52)

Battery Voltage (B+)

Main Relay

PCM C30-B (73)

Heater

 [B2/S2] Control

[CIRCUIT DIAGRAM]

[HARNESS CONNECTORS]

[CONNECTION INFORMATION]

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

Terminal

Connected to

Function

HO2S [B1/S1]

HO2S [B2/S1]

HO2S [B1/S2]

HO2S [B2/S2]

PCM C30-B (70)

Heater

 [B1/S1] Control

HO2S [Bank 1/Sensor 2]
HO2S [Bank 2/Sensor 2]

C91-3,4

2

1

4

3

1

2

3

4

SCMF16110L

FLA -112

FUEL SYSTEM

SIGNAL WAVEFORM AND DATA

E80309D1

Fig1) The signal waveforms of front HO2S(the upper) and heater(the lower) at idle
Fig2) The signal waveforms of rear HO2S(the upper) and heater(the lower) at idle

Fig. 1

Fig. 2

SCMF16158L

The HO2S requires a minimum temperature to provide a closed loop fuel control system. So the HO2S contains a heater
element to reduce its warm-up time and ensure its performance during all driving conditions. The PCM controls this heater
element by duty cycle. The main relay supplies voltage to the heater and the PCM provides a ground circuit for activating
the heater.

MONITOR DTC STATUS

EF54E3EB

1.

Check DTC Status

1)

Connect scantool to Data Link Connector(DLC).

2)

IG "ON".

3)

Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC’s information from the
DTCs menu

4)

Read "DTC Status" parameter.

SCMF16159L

DTC TROUBLESHOOTING PROCEDURES

FLA -113

5)

Is parameter displayed "Present fault"?

YES

▶ Go to "Terminal and connector inspection" procedure.

NO

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM
memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, con-
tamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair"
procedure.

TERMINAL AND CONNECTOR INSPECTION

EB00C1F9

1.

Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by
interference from other electrical systems, and mechanical or chemical damage.

2.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or
damage.

3.

Has a problem been found?

YES

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO

▶ Go to " Component Inspection " procedure.

COMPONENT INSPECTION

E55A281F

1.

Check HO2S(B1/S1) Heater resistance

1)

IG "OFF" and disconnect HO2S(B1/S1) connector

2)

Measure resistance between terminal 3 and 4 of HO2S(B1/S1)(Component Side)

Specification : 3.0 ~ 4.0Ω [21℃(69.8℉)]

C91-1

1. HO2S(B1/S1) Signal

2. Sensor Ground

2

1

4

3

SCMF16227L

3)

Is the measured resistance within specification ?