KIA Niro: Manifold Absolute Pressure Sensor (MAPS)
Description
Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor installed on the surge tank.
It senses absolute pressure of the surge tank and transfers the analog signal proportional to the pressure to the ECM. By using this signal, the ECM calculates the intake air quantity and engine speed.
The MAPS consists of a piezo-electric element and a hybrid IC amplifying the element output signal.
The element is made of silicon diaphragm, which has the pressure sensitive
variable resistor effect of
semi-conductor. One side of silicon diaphragm is 100% vacuum and manifold
pressure is applied on
the other side. Hence, output is gained from the silicon variation in proportion
to the pressure change
Circuit Diagram
Harness Connector
Inspection
- Connect the KDS on the Data Link Connector (DLC).
- Measure the output voltage of the MAPS during idle with IG ON.
Manifold Absolute Pressure Sensor (MAPS) Repair procedures
Removal
- Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
- Disconnect the manifold absolute pressure sensor connector (A).
- Remove the sensor (B) after loosening the mounting bolt from the intake manifold.
Manifold absolute pressure sensor mounting bolt: 9.8 - 11.8 N*m (1.0 - 1.2 kgf*m, 7.2 - 8.7 lb*ft)
Installation
Warning
- Install the component to the specified torque.
- Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
- Insert the sensor in the installation hole and be careful not to damage it.
- Install in the reverse order of removal.
Signal Waveform
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Mass Air Flow Sensor (MAFS)
Description
MAFS uses a sensing element made of a hot-film to measure the mass of intake
air entering the engine
and to send the signal to the ECM.
A large amount of intake air represents acceleration or high load conditions
while a small am
Intake Air Temperature Sensor (IATS)
Specification
Description
Mounted inside the Manifold Absolute Pressure Sensor, Intake Air Temperature
Sensor (IATS) detects
the intake air temperature.
To precisely calculate the amount of air, correction of the air temperature is
requ
Engine Coolant Temperature Sensor (ECTS)
Specification
Description
Located in the engine coolant passage of the cylinder head, Engine Coolant
Temperature Sensor
(ECTS) detects the engine coolant temperature. The ECTS uses a thermistor with
resistance in
proportion to the tempera
SEE MORE:
Crankcase Emission Control System
Schematic Diagram
Repair procedures
Inspection
After disconnecting the vapor hose from the PCV valve, remove the PCV
valve.
Reconnect the PCV valve to the vapor hose.
Run the engine at idle, then put a finger over the open end of the
Rear Bumper beam Assembly
Rear bumper beam assembly
Replacement
Warning
Put on gloves to protect your hands.
Warning
Use a plastic panel removal tool to remove interior trim pieces
without marring the surface.
Be careful not to bend or scratch the trim a
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