Hyundai Palisade: Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Hyundai Palisade (LX2) 2020-2024 Service Manual / Engine Control/Fuel System / Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Description and operation
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.
Because one side of the silicon diaphragm is 100% vacuum and the other is affected by the manifold pressure, this sensor can output analog signal by using the silicon variation proportional to pressure change.

Hyundai Palisade. Description and operation

Specifications
Specification
Pressure (kPa)
Output Voltage (V)
[Vref = 5V]
20.0
0.79
46.66
1.84
101.32
4.0

Hyundai Palisade. Specifications

Schematic diagrams
Circuit Diagram

Hyundai Palisade. Schematic diagrams

Harness Connector

Hyundai Palisade. Schematic diagrams

Repair procedures
Inspection
1.
Connect the diagnostic tool on the Data Link Connector (DLC).
2.
Measure the output voltage of the MAPS during idle with IG ON.
Pressure (kPa)
Output Voltage (V)
[Vref = 5V]
20.0
0.79
46.66
1.84
101.32
4.0

Removal
1.
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2.
Disconnect the vacumm hose (A).
3.
Disconnect the manifold absolute pressure sensor connector (B).
4.
Remove the sensor after loosening the mounting bolt.
Manifold Absolute Pressure Sensor (MAPS) mounting bolt :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures

Installation
Hyundai Palisade. Repair procedures   
Install the component to the specified torque.
Note that internal damage may occur if the component is dropped. In this case, inspect the component before installation.
Hyundai Palisade. Repair procedures   
Insert the sensor in the installation hole and be careful not to damage it during installation.
1.
Install in the reverse order of removal.

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