Kia Rio YB Quiz
Engine Control System/Fuel System

Manifold Absolute Pressure Sensor (MAPS)

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 31Engine Mechanical System — 44Engine Electrical System — 14Emission Control System — 9Engine Control System/Fuel System — 30Clutch System — 10Manual Transmission — 10Automatic Transmission — 23Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 14Brake System — 22Body (Interior and Exterior) — 115Body Electrical System — 84Heating, Ventilation, and Air Conditioning — 28
5steps
~30min
2/5difficulty
Done 0 of 5

Specifications

Specification

Manifold Absolute Pressure (MAP) Sensor

▷ Type: Piezoresistive pressure sensor

Pressure
[kPa (kgf/cm², psi)]		 Output Voltage (V) [Vref = 5 V]
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

The Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the surge tank. It measures the absolute pressure of the surge tank and sends an analog signal proportional to the pressure to the ECM. Using this signal, the ECM calculates the intake air volume and engine speed.

The MAPS consists of a piezoelectric element and a hybrid IC that amplifies the element's output signal. The element is a silicon diaphragm that adapts to pressure and has the piezoresistive effect of a semiconductor. Since vacuum and intake manifold pressure are applied to both sides of the sensor respectively, the sensor can output an analog signal proportional to the pressure change via the silicon.

Circuit Diagrams

Wiring Diagram

Repair Procedures

Inspection

  1. Connect KDS/GDS to the Data Link Connector (DLC).

  2. Check the MAPS output voltage at idle with IG ON.

    Pressure
    [kPa (kgf/cm², psi)]    		 Output Voltage (V) [Vref = 5 V]
    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 the ignition switch OFF and disconnect the negative (-) battery terminal.

  2. Disconnect the MAP sensor connector (A).

  3. Remove the mounting screw (B) and remove the sensor from the expansion tank.

Installation

  1. Installation is the reverse of removal.

Troubleshooting

Waveform

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