Hyundai Genesis: Engine Control System / Accelerator Position Sensor (APS) Description and Operation
Accelerator Position Sensor (APS) is installed on the
accelerator pedal module and detects the rotation angle of the
accelerator pedal. The APS is one of the most important sensors in
engine control system, so it consists of the two sensors which adapt
individual sensor power and ground line. The second sensor monitors the
first sensor and its output voltage is half of the first one. If the
ratio of the sensor 1 to 2 is out of the range (approximately 1/2), the
diagnostic system judges that it is abnormal.

Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the OPS connector.
3.
Remove the OPS (Refer to "Removal").
4.
After immersing the thermistor of the sensor into engine coolant ...
Specification
AcceleratorPositionOutput Voltage (V)APS1APS2C.T0.7 ~ 0.80.33 ~ 0.43W.O.T3.85 ~ 4.351.93 ~ 2.18
...
Other information:
If you place the Engine Start/Stop
button in to the ACC or OFF position
with the headlamps ON, the headlamps
(and/or parking lamps) remain
on for about 5 minutes. However,
with the engine off if the driver’s door
is opened and closed, the headlamps
(and/or parking lamps) are
turned ...
Replacement and Air Bleeding
Never remove the radiator cap when the engine is hot. A
serious scalding could be caused by high-pressure hot fluid escaping
from the radiator.
When pouring engine coolant, be sure to shut the relay box
lid and not ...