Hyundai GENESIS COUPE BK 2010 Manual page 722

▶ Go to the applicable troubleshooting procedure.
Fuel System > Engine Control System > P0131 O2 Sensor Circuit Low Voltage(Bank 1 /
Sensor 1)
Component Location
General Description
In order to control emissions of the CO, HC and NOx components of the exhaust gas, heated oxygen sensor (HO2S),
mounted on the front side and rear side of catalytic converter, detects the oxygen content in the exhaust gas. The front
HO2S signal is used to control air/fuel ratio (closed loop fuel control) and the rear HO2S signal is used to monitor front
HO2S and catalyst for proper operation. The HO2S requires a minimum temperature to operate properly and provide a
closed loop fuel control system. The HO2S contains the heater element to reduce its warming-up time and ensure its
performance during all driving conditions. The oxygen sensor generates a voltage that indicates the difference between
the oxygen content of the exhaust stream and the oxygen content of ambient air. When the exhaust stream is "rich,"
there is more oxygen in the ambient air than in the exhaust stream, so the voltage will be higher.
DTC Description
Checking output signals from HO2S under detecting condition, if an output signal is below 0.04V for more than
predeterminate time, ECM sets P0131. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till
consecutive 2 driving cycle.
DTC Detecting Condition
Item
DTC Strategy
Enable Conditions
Threshold value
Diagnosis Time
Detecting Condition
• Monitor signal voltage
• Battery voltage ≥ 10V
• Engine running ≥ 60 sec
• Engine warm-up state
• The voltage of HO2S(B1/S1) < 0.04V
• Continuous (more than 12.5 sec. failure for every 15
sec.test)
Possible Cause
• Poor connection
• Short to ground in harness
• HO2S(B1/S1)
• ECM