Hyundai Santa Fe (2006 year). Manual - part 516

FLA -130

FUEL SYSTEM

SIGNAL WAVEFORM AND DATA

EF09793A

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

E7B82B16

Refer to DTC P0036.

TERMINAL AND CONNECTOR INSPECTION

E15C4596

Refer to DTC P0036.

CONTROL CIRCUIT INSPECTION

E24CC29E

1.

IG "OFF" ＆ disconnect HO2S(B1/S2) connector.

2.

IG "ON" ＆ ENG "OFF".

3.

Measure voltage between terminal 4 of HO2S(B1/S2) harness connector and chassis ground.

Specification : Approx. 0 V

4.

Is the measured voltage within specification ?

YES

▶ Go to HO2S(B1/S2) "Component Inspection" procedure.

NO

▶ Repair short to battery in HO2S (B1/S2) heater control circuit and go to "Verification of Vehicle Repair" procedure.

DTC TROUBLESHOOTING PROCEDURES

FLA -131

COMPONENT INSPECTION

E0BA325D

1.

Check HO2S(B1/S2) Heater resistance

1)

IG "OFF" and disconnect HO2S(B1/S2) connector

2)

Measure resistance between terminal 3 and 4 of HO2S(B1/S2)(Component Side)

SPECIFICATION :

Heater

Resistance (Ω )

3.0 ~ 4.0Ω [21℃(69.8℉)]

1. HO2S(B1/S2) Signal

2. Sensor Ground

C91-3

2

1

4

3

SCMF16169L

3)

Is the measured resistance within specification ?

YES

▶ Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, go to "Verification of Vehicle Repair" procedure.

NOTE

There is a memory reset function on scantool that can erase optional parts automatically detected and memorized
by PCM.
Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.

NO

▶ Substitute with a known - good HO2S(B1/S2) and check for proper operation.
If the problem is corrected, go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR

E8682525

Refer to DTC P0036.

FLA -132

FUEL SYSTEM

DTC P0050 HO2S HEATER CONTROL CIRCUIT (BANK 2 / SENSOR 1)

COMPONENT LOCATION

EFDFCD54

HO2S [Bank 2/Sensor 1]

LGLG506A

GENERAL DESCRIPTION

E396D5EE

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

EC4910CB

Checking current from HO2S under detecting condition,if the heater current is below a certain threshold for more than
predeterminate time, PCM sets P0050. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consec-
utive 2 driving cycle.

DTC DETECTING CONDITION

E470B0D8

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 O2 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
• HO2S(B2/S1)
• PCM

DTC TROUBLESHOOTING PROCEDURES

FLA -133

SPECIFICATION

E323CB65

(REFERENCE ONLY)

Condition

Current(A)

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

0.25 ± 0.1

SCHEMATIC DIAGRAM

E698EE52

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