Hyundai GENESIS COUPE BK 2010 Manual page 648

▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
Fuel System > Engine Control System > P0108 Manifold Absolute Pressure/Barometric
Pressure Circuit High Input
Component Location
General Description
The amount of intake air flow must be inputted to ECM in order to determine the fuel injection quantity. To measure the
pressure inside of intake manifold, MAFS is used at idle and MAPS is required at accelerating. MAPS(Manifold Absolute
Pressure) calculates the amount of air indirectly as measuring the pressure inside of intake manifold. This system is
called a Speed-Density type.
MAPS transfers analog output signal which is proportional to the change of intake manifold pressure, then, with this
signal and RPM, ECM calculates the amount of intake air flow.
The MAPS is mounted on surge tank to measure the pressure inside of intake manifold, and it consists of a piezo
electric element and hybrid IC which amplifies output signal from the element. A piezo electric element is a sort of a
diaphragm using piezo electric effect. One side of the diaphragm is surrounded with vacuum chamber while intake
pressure is applied to the other side. Thus, signals are output by the transformation of diagphragm according to the
change of pressure inside of intake manifold.
DTC Description
Checking output signals of MAPS every 5 sec. under detecting condition, if an output signal is above 4.5V for more
than 2.5 sec., ECM sets P0108. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till consecutive 2
driving cycle.
DTC Detecting Condition
Item
DTC Strategy
Case 1
Detecting Condition
• This code detects a continuous short to high in either
the signal circuit or the MAP sensor
• No TPS Active Fault Present
• Engine Running Time > 10sec
• Engine Speed ≤ 2500rpm
Possible Cause