Hyundai GENESIS COUPE BK 2010 Manual page 793

▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
Fuel System > Engine Control System > P0154 O2 Sensor Circuit No Activity Detected
(Bank 2 / 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 voltage is Approx. 0.45V or 3.5V for more
than predeterminate time, ECM sets P0154. The MIL(Malfunction Indicator Lamp) will illuminate when the fault remains
for 2 consecutive drive cycles
DTC Detecting Condition
Item
DTC Strategy
Enable Conditions
Case 1
Detecting Condition
• Monitor signal voltage
• Battery voltage ≥ 10V
• Engine running ≥ 60 sec
• Engine warm-up state
• No disable faults
• 1.2V ≤ Voltage of HO2S ≤ 3.9V
Possible Cause
• Poor connection
• Open in harness