Hyundai Santa Fe (2006 year). Manual — part 554
FLA -282
FUEL SYSTEM
DTC P0157 HO2S CIRCUIT LOW VOLTAGE (BANK 2 / SENSOR 2)
COMPONENT LOCATION
EC466B58
HO2S [Bank 2/Sensor 2]
SCMF16176L
GENERAL DESCRIPTION
E68CCF51
The rear heated oxygen sensor is mounted on the rear side of the Catalytic Converter (warm-up catalytic converter) or
in the rear exhaust pipe, which is able to detect catalyst efficiency. The rear heated oxygen sensor (HO2S) produces a
voltage between 0V and 1V. This rear heated oxygen sensor is used to estimate the oxygen storage capability. If a catalyst
has good conversion properties, the oxygen fluctuations are smoothed by the oxygen storage capacity of the catalyst. If
the conversion provided by the catalyst is low due to aging, poisoning or misfiring, then the oxygen fluctuations are similar
to signals from the front oxygen sensor.
DTC DESCRIPTION
EE482644
Checking output signals from HO2S under detecting condition, if an output signal is below 0.04V for more than predeter-
minate time, PCM sets P0157. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2
driving cycle.
DTC DETECTING CONDITION
E814A11A
Item
Detecting Condition
Possible cause
DTC Strategy
• Monitor signal voltage
Enable Conditions
• Battery voltage ≥ 10V
• Engine running ≥ 60 sec.
• Engine warm-up state
Threshold value
• The voltage of HO2S(B2/S2) < 0.04V
Diagnosis Time
• Continuous
(more than 12.5 sec. failure for every 15 sec.test)
MIL On Condition
• 2 Driving Cycles
• Poor connection
• Short to ground in harness
• HO2S(B2/S2)
• PCM
DTC TROUBLESHOOTING PROCEDURES
FLA -283
SPECIFICATION
ECAFA1F6
(REFERENCE ONLY)
Test Condition
HO2S Voltage(Sensor1)
HO2S Voltage(Sensor2)
HO2S Signal
at idle after warm-up
Signal is commonly switching
from rich to lean more than 3
times in 10 sec.
Signal is commonly above 0.6V.
HO2S signal at open circuit
(Pumping current OFF)
Approx. 0.45V
HO2S signal at open circuit
(Pumping current ON)
Approx.
3.5V
FLA -284
FUEL SYSTEM
SCHEMATIC DIAGRAM
E9EEF01F
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 -285
SIGNAL WAVEFORM AND DATA
EBC8409A
Fig) Signal waveforms of front HO2S(the upper) and rear HO2S(the lower)
SCMF16223L
After warming-up, if accelerator pedal is released suddenly around 4000rpm, the HO2S signal reading will be lower than
200mV resulting from Fuel cut-off for the moment. Conversely, if suddenly accelerator pedal is depressed, HO2S signal
reading will be around 0.6V ~1.0V. At idle, Normally HO2S signal will switch from lean to rich with 3 Hz. And as racing,
Its frequency rises.
MONITOR DTC STATUS
EC7B4E32
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
5)
Is parameter displayed "Present fault"?
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