Hyundai i-30: Engine Control System / Manifold Absolute Pressure Sensor (MAPS)

Hyundai i30 (PD) 2018-2025 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 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.

Specifications

Specification

Pressure [kPa (kg/cm², psi)]	Output Voltage (V)
10 (0.10, 1.45)	0.5
40 (0.41, 5.80)	0.913
80 (0.82, 11.60)	1.465
120 (1.22, 17.40)	2.017
160 (1.63, 23.21)	2.569
200 (2.04, 29.01)	3.12
220 (2.24, 31.91)	3.396
240 (2.45, 34.81)	3.672
280 (2.86, 40.61)	4.224
300 (3.06, 43.51)	4.5

Troubleshooting

Signal Waveform

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

1.	Connect the diagnostic tool on the Data Link Connector (DLC).

Measure the output voltage of the MAPS at idle and IG ON.

Condition	Output Voltage (V)
IG ON	3.9 - 4.1
Idle	0.8 1.6

Removal

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

2.	Disconnect the manifold absolute pressure sensor connector (A).

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

Tightening Torque :

9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

Installation

•	Install the component with the specified torques.

•	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.

1.	Install in the reverse order of removal.

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