Hyundai Santa Fe (2006 year). Manual — part 519
FLA -142
FUEL SYSTEM
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(B2/S1) and check for proper operation.
If the problem is corrected, go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
EBC231F8
Refer to DTC P0050.
DTC TROUBLESHOOTING PROCEDURES
FLA -143
DTC P0056 HO2S HEATER CONTROL CIRCUIT (BANK 2 / SENSOR 2)
COMPONENT LOCATION
E817128B
HO2S [Bank 2/Sensor 2]
SCMF16176L
GENERAL DESCRIPTION
EE20DCF2
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
E95D0768
Checking current from HO2S under detecting condition,if the heater current is below a certain threshold for more than
predeterminate time, PCM sets P0056. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consec-
utive 2 driving cycle.
DTC DETECTING CONDITION
E8E45268
Item
Detecting Condition
Possible cause
DTC Strategy
• Monitor the current through the heater
Enable Conditions
• Engine Running > 60 sec.
• Heater Duty Cycle > 18%
• 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
• HO2S(B2/S2)
• PCM
FLA -144
FUEL SYSTEM
SPECIFICATION
E28FDF13
(REFERENCE ONLY)
Condition
Current(A)
Heater Current at 13.5V, 450℃(842 F) Exhaust
0.52 ± 0.1
SCHEMATIC DIAGRAM
E14CB6D5
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
DTC TROUBLESHOOTING PROCEDURES
FLA -145
SIGNAL WAVEFORM AND DATA
E0BCDEF2
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
E22844FA
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
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