Kia Rio: Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Kia Rio 2017-2020 YB Service Manual / Engine Control / Fuel System / Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Specifications
Specification

Manifold Absolute Pressure Sensor (MAPS)

▷ Type: Piezo-resistive pressure sensor type

Pressure
[kPa (kgf/cm², psi)]
Output Voltage (V) [Vref = 5V]
20.0 (0.20, 2.9)
0.79
46.7 (0.47, 6.77)
1.84
101.32 (1.03, 14.7)
4.0

Description and operation
Description

Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is 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 silicon diaphragm type and adapts pressure sensitive variable resistor effect of semi-conductor. Because 100% vacuum and the manifold pressure apply to both sides of the sensor respectively, this sensor can output analog signal by using the silicon variation proportional to pressure change.

Schematic diagrams
Circuit Diagram

Repair procedures
Inspection
1.

Connect a KDS/GDS on Data Link Connector (DLC).

2.

Check MAPS output voltage at idle and IG ON.

Pressure
[kPa (kgf/cm², psi)]
Output Voltage (V) [Vref = 5V]
20.0 (0.20, 2.9)
0.79
46.7 (0.47, 6.77)
1.84
101.32 (1.03, 14.7)
4.0

Removal
1.

Turn ignition switch OFF and disconnect the battery negative (-) terminal.

2.

Disconnect the manifold absolute pressure sensor connector (A).

3.

Remove the installation screw (B), and then remove the sensor from the surge tank.

Installation
  

Install the component with the specified torques.

Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

Insert the sensor in the installation hole and be careful not to damage when installation.

1.

Installation is reverse of removal.

Troubleshooting
Waveform

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